[Federal Register Volume 63, Number 161 (Thursday, August 20, 1998)]
[Rules and Regulations]
[Pages 44545-44552]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-22240]


=======================================================================
-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 98-ANE-27-AD; Amendment 39-10713; AD 98-17-11]
RIN 2120-AA64


Airworthiness Directives; Textron Lycoming and Teledyne 
Continental Motors Reciprocating Engines

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: This amendment adopts a new airworthiness directive (AD), 
applicable to certain Textron Lycoming and Teledyne Continental Motors 
reciprocating engines that had crankshafts repaired by Nelson Balancing 
Service, Repair Station Certificate No. NB7R820J, Bedford, 
Massachusetts, that requires removal from service of affected 
crankshafts, or a visual inspection, magnetic particle inspection, and 
dimensional check of the crankshaft journals, and, if necessary, rework 
or removal from service of affected crankshafts and replacement with 
serviceable parts. This amendment is prompted by reports of crankshafts 
exhibiting heat check cracking of the nitrided bearing surfaces which 
led to crankshaft cracking and subsequent failure. The actions 
specified by this AD are intended to prevent crankshaft failure due to 
cracking, which could result in an inflight engine failure and possible 
forced landing.

DATES: Effective October 19, 1998.

FOR FURTHER INFORMATION CONTACT:
Rocco Viselli, Aerospace Engineer (assigned to Textron Lycoming), New 
York Aircraft Certification Office, FAA, Engine and Propeller 
Directorate, 10 Fifth St., 3rd Floor, Valley Stream, NY 11581-1200; 
telephone (516) 256-7531, fax (516) 568-2716; or Jerry Robinette, 
Aerospace Engineer (assigned to Teledyne Continental Motors), Atlanta 
Aircraft Certification Office, FAA, Small Airplane Directorate, 1895 
Phoenix Boulevard, One Crown Center, Suite 450, Atlanta, GA 30349; 
telephone (770) 703-6096, fax (770) 703-6097.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) to include an airworthiness 
directive (AD) that is applicable to certain Textron Lycoming and 
Teledyne Continental Motors (TCM) reciprocating engines that had 
crankshafts repaired by Nelson Balancing Service, Repair Station

[[Page 44546]]

Certificate No. NB7R820J, Bedford, Massachusetts, was published in the 
Federal Register on May 11, 1998 (63 FR 25781). That action proposed to 
require removal from service of affected crankshafts, or a visual 
inspection, magnetic particle inspection, and dimensional check of the 
crankshaft journals, and, if necessary, rework or removal from service 
of affected crankshafts and replacement with serviceable parts.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the comments received.
    One commenter states that the proposed AD is insufficiently 
researched; specific dates and serial numbers are needed for affected 
crankshafts. The commenter suggests that there were periods during the 
time frame of interest when the grinding was acceptable. The FAA does 
not concur. The FAA believes that this AD has been thoroughly 
researched. The failures/known cases of crankshaft nitride cracking 
occur throughout the time period. There is no way to isolate one 
specific time and determine that crankshafts during that time were 
satisfactorily repaired. Those crankshafts that are identified in the 
company's records are presented in the AD, but the FAA has determined 
that these records are incomplete. Therefore, the applicability of the 
AD must include all crankshafts identified in aircraft owners' and 
other repair station records as being repaired at Nelson during the 
suspect time period.
    The same commenter questions how many TCM O-470 crankshafts have 
been determined to be bad and if there is a sufficient percentage to 
warrant tearing down all O-470 engines that Nelson repaired during this 
time period. The FAA does not concur. The available data indicates that 
crankshafts from O-470 engines were subject to the same improper repair 
procedures as crankshafts from other engines. Of the three related 
failure events, one occurred on an O-470-R engine. Therefore, the FAA 
has determined that all crankshafts repaired by Nelson Air Services 
during the suspect time period have the potential of causing an unsafe 
condition.
    The same commenter believes that the proposed AD is based on 
failures of aerobatic engines. The commenter suggests that the AD is an 
overly reactive extrapolation from highly stressed aerobatic 
crankshafts to comparatively mildly stressed non-aerobatic engines. The 
FAA does not concur. The FAA is unaware of any information that 
indicates that the safety analysis presented in the NPRM is biased by 
aerobatic engine data. There is only one aerobatic engine listed. The 
other engines are used in normal or utility category applications. The 
data indicates that nitride cracking of the crankshafts is not limited 
to specific flight operations but rather a matter of an improper 
grinding procedure that can result in heat check cracking of the 
nitride surface.
    The same commenter states that the AD should not be issued as 
written, but only imposed on those who have a reasonable likelihood of 
having a bad crankshaft, due to expense required to tear down an 
engine. The FAA does not concur. The expense of the AD was certainly 
considered as evidenced by the NPRM economic impact statement. However, 
it must be emphasized that the FAA has made a determination that an 
unsafe condition is likely to exist on crankshafts repaired by Nelson 
during the suspect time period. The FAA determined that an AD was 
necessary after consideration of both the severity of the potential 
unsafe condition and the economic impact of the action.
    One commenter states that the AD should not apply to crankshafts 
which were in the Nelson shop for balancing, it should only apply to 
those which had the journals ground. The FAA does not concur. The data 
indicates that deficient process controls existed at Nelson Balancing 
Service during the suspect time period and therefore all crankshafts 
which were repaired in the Nelson shop during that time are suspect. 
However, if an individual can substantiate that any given crankshaft 
should be exempt from the requirements of the AD based on the extent of 
repairs performed by Nelson, then this data can be presented through an 
FAA Airworthiness Inspector as an Alternative Method of Compliance with 
the AD.
    This commenter further states that the AD should reaffirm that only 
those work order numbers noted in the AD are affected. The FAA does not 
agree. The work orders listed in the AD are intended as guidance only 
as the FAA can not be absolutely sure that all crankshafts are 
accounted for in the listing.
    One commenter states that the AD should apply only to those 
crankshafts repaired after September 1995, arguing that date 
represented the earliest repair date for the crankshaft that 
demonstrated a problem in service after being serviced by Nelson. The 
FAA does not concur. The crankshaft with the earliest repair date to 
have exhibited a problem in service was repaired in February 1995 and 
failed after only 30 hours in service. The repair station was 
certificated in September 1994. Thus, the FAA has limited this AD to 
only those engines with crankshafts on which this unsafe condition 
either exists or is likely to develop.
    After careful review of the available data, including the comments 
noted above, the FAA has determined that air safety and the public 
interest require the adoption of the rule as proposed.
    There are approximately 250,000 engines of the designs listed in 
the applicability section of this AD in the worldwide fleet. The FAA 
estimates that 200,000 of those engines are installed on aircraft of 
U.S. registry. Of these it is estimated that 30% or 60,000 engines will 
have had an overhaul in the time frame of interest; however, only 291 
would be required to take compliance action. Of this 60,000 it is 
estimated that 10,000 will require removal of the propeller spinner to 
determine applicability of the AD. The cost associated with the spinner 
removal/replacement is estimated to be $60 per work hour average labor 
rate times one hour. It will take approximately 90 work hours per 
engine to accomplish the proposed action and the average labor rate is 
$60 per work hour. Required parts would cost $115 per engine for 
gaskets, seals, etc. In addition, it is estimated that half of the 291 
affected engines can be reworked at a cost of $1,800 per engine and 
that the other half of the 291 affected engines will be rejected, plus 
purchasing another crankshaft which will cost $4,000 per engine. Based 
on these figures, the total cost impact of the AD on U.S. operators is 
estimated to be $3,048,765.
    The regulations adopted herein will not have substantial direct 
effects on the States, on the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government. Therefore, in 
accordance with Executive Order 12612, it is determined that this final 
rule does not have sufficient federalism implications to warrant the 
preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this action (1) is 
not a ``significant regulatory action'' under Executive Order 12866; 
(2) is not a ``significant rule'' under DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979); and (3) will not have a 
significant economic impact, positive or negative, on a substantial 
number of small entities under the criteria of the Regulatory 
Flexibility Act. A final evaluation has been prepared for this action 
and it is contained in the Rules Docket. A copy

[[Page 44547]]

of it may be obtained from the Rules Docket at the location provided 
under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air Transportation, Aircraft, Aviation safety, Safety.

Adoption of the Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration amends part 39 of 
the Federal Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by adding the following new 
airworthiness directive:

98-17-11  Textron Lycoming and Teledyne Continental Motors: 
Amendment 39-10713. Docket 98-ANE-27-AD.

    Textron Lycoming (LYC) O-235, O-235-C1, O-235-C2C, O-235-L2C, O-
235-N2C, O-290, O-290-D2, O-320, O-320-A, O-320-A1A, O-320-A2B, O-
320-B2B, O-320-B2C, O-320-D2J, O-320-D3G, O-320-E2A, O-320-E2D, O-
320-E2G, O-320-E3D, O-320-H2AD, O-360, O-360A1A, O-360-A1D, O-360-
A3A, O-360-A4A, O-360-A4K, O-360-B1B, IO-360-F1A6, AEIO-320-E1B, 
HIO-360-C1A, IO-320, IO-320-B1A, IO-360, IO-360-A1A, IO-360-A1B6, 
IO-360-B1E, IO-360-C, IO-360-C1C, IO-360-C1C6, IO-360-C1D6, IO-360-
D, O-540-A1B5, O-540-A1D5, O-540-R2AD, IO-540, IO-540-C4B5, IO-540-
S1A5, TIO-540-A2, LIO-320-C1A, LIO-360-C1E6, and IO-720 
reciprocating engines; and Teledyne Continental Motors (TCM) A-65, 
A65-3, A65-8, A75, A75-8, C75-12, C85, C85-8, C85-12, C90-8FJ, C90-
12, O-200, O-200-A, O-300, O-300-D, IO-360-C, E-185-4, E-225-8, O-
470, O-470-K, O-470-L, O-470-R, O-470-11, IO-470, IO-470-N, IO-470-
S, IO-520, IO-520-D, GTSIO-520, and TSIO-520-VB reciprocating 
engines, with installed crankshafts repaired by Nelson Balancing 
Service, Bedford, Massachusetts, Repair Station Certificate No. 
NB7R820J, between February 1, 1995, and December 31, 1997, 
inclusive, as listed (by work order (W/O)) in Table 1 of this AD.

                                                                         Table 1                                                                        
--------------------------------------------------------------------------------------------------------------------------------------------------------
                Engine and model                              W/O                          Date                            Engine Ser. No.              
--------------------------------------------------------------------------------------------------------------------------------------------------------
LYC:                                                                                                                                                    
  AEIO-320-E1B..................................                         1134                      2/17/96  L-5653-55A                                  
  HIO-360-C1A...................................                         1155                       2/7/96  L-12126-51A                                 
  IO-320........................................                         1141                      1/17/96  ............................................
  IO-320-B1A....................................                         1525                     11/14/97  ............................................
  IO-360........................................                         1314                     12/17/96  ............................................
  IO-360........................................                       IN6137                       8/7/97  ............................................
  IO-360-A1A....................................                         1230                      6/10/96  L-474-51                                    
  IO-360-A1A....................................                         1289                     10/23/96  L-4085-5174                                 
  IO-360-A1A....................................                        1415b                      5/23/97  RL-3920-51A                                 
  IO-360-A1B6...................................                         1463                      7/31/97  ............................................
  IO-360-B1E....................................                         1312                     12/12/96  L-4453-51A                                  
  IO-360-C......................................                         1146                      1/23/96  R-51448-9-C                                 
  IO-360-C1C....................................                         1336                      2/10/97  ............................................
  IO-360-C1C....................................                         1518                      12/9/97  ............................................
  IO-360-C1C6...................................                         1530                     11/25/97  ............................................
  IO-360-C1C6...................................                         1537                      12/9/97  L-19294-51A                                 
  IO-360-C1D6...................................                         1286                      4/28/97  ............................................
  IO-360-D......................................                         1540                      12/2/97  ............................................
  IO-360-F1A6...................................                         1176                       3/7/96  L-27423-36A                                 
  IO-540........................................                         1014                       2/8/95  ............................................
  IO-540........................................                         1056                      6/13/95  ............................................
  IO-540........................................                         1302                      12/5/96  ............................................
  IO-540-C4B5...................................                         1313                     12/17/96  L-19547-48                                  
  IO-540-S1A5...................................                         1513                     10/27/97  L-19597-48A                                 
  IVO-435-G1A...................................                         1271                      10/1/96  ............................................
  LIO-320-C1A...................................                         1158                       2/8/96  ............................................
  LIO-360-C1E6..................................                         1280                      10/7/96  ............................................
  LIO-360-C1E6..................................                         1281                      10/9/96  ............................................
  O-235.........................................                         1013                      2/21/95  ............................................
  O-235.........................................                         1051                       6/2/95  ............................................
  O-235.........................................                         1054                       6/9/95  ............................................
  O-235.........................................                         1057                      6/14/95  L-9041-15                                   
  O-235.........................................                         1058                      6/29/95  ............................................
  O-235.........................................                         1060                      6/30/95  ............................................
  O-235.........................................                         1069                      8/10/95  ............................................
  O-235.........................................                         1110                      2/20/96  ............................................
  O-235.........................................                         1145                      1/23/96  ............................................
  O-235.........................................                         1151                      1/25/96  ............................................
  O-235.........................................                         1160                       2/9/96  RL-24636-15                                 
  O-235.........................................                         1305                      12/5/96  L-22542-15                                  
  O-235.........................................                         1329                      2/11/97  ............................................
  O-235.........................................                         1332                      2/11/97  ............................................
  O-235.........................................                         1481                       9/2/97  ............................................
  O-235-C1......................................                         1089                      10/8/95  L-6475-15                                   
  O-235-C1......................................                         1188                       4/2/96  L-7143-15                                   
  O-235-C1......................................                         1335                      3/12/97  L-5569-15                                   
  O-235-C1......................................                         1367                      3/24/97  ............................................
  O-235-C2C.....................................                         1019                      2/24/95  L-12284-15                                  

[[Page 44548]]

                                                                                                                                                        
  O-235-C2C.....................................                         1040                       5/8/95  ............................................
  O-235-C2C.....................................                         1105                      12/1/95  L-12273-15                                  
  O-235-L2C.....................................                         1030                       4/6/95  L-14545-15                                  
  O-235-L2C.....................................                         1036                      4/24/95  ............................................
  O-235-L2C.....................................                         1037                      4/24/95  L-23012-15                                  
  O-235-L2C.....................................                         1050                       6/2/95  L-15542-15                                  
  O-235-L2C.....................................                         1062                       7/5/95  L-18306-15                                  
  O-235-L2C.....................................                         1067                       8/8/95  ............................................
  O-235-L2C.....................................                         1070                      8/10/95  L-160015-15                                 
  O-235-L2C.....................................                         1095                     11/14/95  RL-023227-15                                
  O-235-L2C.....................................                         1101                      11/4/95  L-15300-15                                  
  O-235-L2C.....................................                         1102                     11/15/95  L-20183-15                                  
  O-235-L2C.....................................                         1162                      2/14/96  L-16114-15                                  
  O-235-L2C.....................................                         1179                      3/11/96  L-21215-15                                  
  O-235-L2C.....................................                         1219                      5/16/96  L-21215-15                                  
  O-235-L2C.....................................                         1251                      8/22/96  ............................................
  O-235-L2C.....................................                         1285                     10/19/96  ............................................
  O-235-L2C.....................................                         1365                      3/24/97  ............................................
  O-235-L2C.....................................                         1400                      4/28/97  ............................................
  O-235-L2C.....................................                         1414                       8/5/97  ............................................
  O-235-L2C.....................................                         1417                      12/5/97  ............................................
  O-235-L2C.....................................                         1433                      6/26/97  L-17074-15                                  
  O-235-L2C.....................................                         1435                       6/9/97  ............................................
  O-235-L2C.....................................                         1504                     10/31/97  ............................................
  O-235-L2C.....................................                         1508                     11/18/97  ............................................
  O-235-L2C.....................................                         1524                     11/12/97  ............................................
  O-235-L2C.....................................                         1536                     11/24/97  ............................................
  O-235-L2C.....................................                         2010                     11/19/97  ............................................
  O-235-N2C.....................................                         1511                     10/29/97  L-23857-15                                  
  O-290.........................................                         1257                       9/4/96  ............................................
  O-290.........................................                         1326                      3/26/97  ............................................
  O-290-D2......................................                         1082                      9/26/95  L-6019-21                                   
  O-320.........................................                         1018                      2/22/95  ............................................
  O-320.........................................                         1024                      3/17/95  ............................................
  O-320.........................................                         1038                      5/13/95  L-39272-27A                                 
  O-320.........................................                         1045                      5/24/95  ............................................
  O-320.........................................                         1084                      9/28/95  ............................................
  O-320.........................................                         1116                       1/8/95  ............................................
  O-320.........................................                         1125                       1/8/96  ............................................
  O-320.........................................                         1169                      2/28/96  ............................................
  O-320.........................................                         1175                       3/7/96  ............................................
  O-320.........................................                         1184                      3/28/96  ............................................
  O-320.........................................                         1189                      8/27/96  ............................................
  O-320.........................................                         1202                      4/30/96  ............................................
  O-320.........................................                         1212                      5/10/96  ............................................
  O-320.........................................                         1283                     10/17/96  ............................................
  O-320.........................................                         1316                     12/21/96  ............................................
  O-320.........................................                         1340                      2/25/97  L-24367                                     
  O-320.........................................                         1347                      2/18/97  ............................................
  O-320.........................................                         1360                      3/10/97  ............................................
  O-320.........................................                         1361                      3/10/97  ............................................
  O-320.........................................                         1436                      5/29/97  ............................................
  O-320.........................................                         1468                      8/14/97  ............................................
  O-320.........................................                         1474                      8/22/97  L-13130-39A                                 
  O-320.........................................                         1477                      9/13/97  ............................................
  O-320.........................................                         1477                      9/13/97  ............................................
  O-320.........................................                         1507                     11/18/97  ............................................
  O-320.........................................                         1519                     11/21/97  ............................................
  O-320.........................................                         1546                      12/7/97  ............................................
  O-320.........................................                         1171                       3/1/06  ............................................
  O-320-A.......................................                         1192                      4/13/96  ............................................
  O-320-A.......................................                         1194                      4/13/96  ............................................
  O-320-A.......................................                         1196                      4/13/96  ............................................
  O-320-A1A.....................................                         1244                      8/13/96  L-5270-27                                   
  O-320-A2B.....................................                         1081                      9/22/95  ............................................
  O-320-A2B.....................................                         1461                       9/9/97  L-12626-27                                  
  O-320-B2B.....................................                         1452                      7/10/97  L-2977-39                                   
  O-320-B2C.....................................                         1315                     12/17/96  ............................................
  O-320-D2J.....................................                         1172                       3/4/96  L-13039-39A                                 
  O-320-D2J.....................................                         1173                       3/7/96  L-123412-39A                                
  O-320-D2J.....................................                         1253                       9/4/96  ............................................
  O-320-D2J.....................................                         1534                     11/25/97  ............................................

[[Page 44549]]

                                                                                                                                                        
  O-320-D2J.....................................                         1539                      12/3/97  ............................................
  O-320-D3G.....................................                         1077                      9/17/95  ............................................
  O-320-D3G.....................................                         1114                       1/8/96  L-10983-39A                                 
  O-320-D3G.....................................                         1354                      2/25/97  ............................................
  O-320-D3G.....................................                         1370                      3/26/97  H45247                                      
  O-320-D3G.....................................                         1544                      12/3/97  ............................................
  O-320-E2A.....................................                         1103                     11/10/95  L-26363-27A                                 
  O-320-E2A.....................................                         1191                      4/13/96  L-19377-27A                                 
  O-320-E2A.....................................                         1317                     12/21/96  L-15219-27A                                 
  O-320-E2A.....................................                         1439                       6/9/97  L-38003-55A                                 
  O-320-E2D.....................................                         1068                      8/10/95  L-35528-27A                                 
  O-320-E2D.....................................                         1078                      9/17/95  ............................................
  O-320-E2D.....................................                         1177                       3/9/96  L-44732-27A                                 
  O-320-E2D.....................................                         1181                      3/14/96  ............................................
  O-320-E2D.....................................                         1241                       8/9/96  L-42691-27A                                 
  O-320-E2D.....................................                         1245                      8/13/96  L-40483-27A                                 
  O-320-E2D.....................................                         1260                       9/9/96  L-15300-15                                  
  O-320-E2D.....................................                         1343                      2/17/97  ............................................
  O-320-E2D.....................................                         1346                       3/2/97  L-44320-27A                                 
  O-320-E2D.....................................                         1385                      4/16/97  ............................................
  O-320-E2D.....................................                         1458                      7/18/97  ............................................
  O-320-E2D.....................................                         1533                     11/25/97  ............................................
  O-320-E2D.....................................                         1549                     12/12/97  ............................................
  O-320-E2G.....................................                         1338                      3/10/97  L-38264-27A                                 
  O-320-E3D.....................................                         1034                      4/18/95  L-29668-27A                                 
  O-320-E3D.....................................                         1074                      8/24/95  L-29495-27A                                 
  O-320-E3D.....................................                         1431                       6/9/97  L-33770-27A                                 
  O-320-E3D.....................................                         1444                      6/13/97  ............................................
  O-320-E3D.....................................                         1500                      10/7/97  L-33841-27A                                 
  O-320-H2AD....................................                         1322                      1/22/97  L-1530-78T                                  
  O-360.........................................                         1025                      3/17/95  ............................................
  O-360.........................................                         1157                       2/7/96  ............................................
  O-360.........................................                         1199                      4/18/96  ............................................
  O-360.........................................                         1362                      3/10/97  ............................................
  O-360.........................................                         1386                      4/17/97  ............................................
  O-360.........................................                         1394                       5/6/97  ............................................
  O-360.........................................                         1528                     11/19/97  ............................................
  O-360-A1A.....................................                         1170                      2/28/96  L-20677-36A                                 
  O-360-A1A.....................................                         1214                      5/14/96  L-20190-36A                                 
  O-360-A1A.....................................                         1239                       8/5/96  ............................................
  O-360-A1D.....................................                         1411                       5/5/97  ............................................
  O-360-A3A.....................................                         1531                     11/25/97  ............................................
  O-360-A4A.....................................                         1270                      9/27/96  L-14008-36A                                 
  O-360-A4A.....................................                         1464                      7/30/97  L-24796-36A                                 
  O-360-A4A.....................................                         1486                       9/6/97  ............................................
  O-360-A4A.....................................                         1529                     11/25/97  ............................................
  O-360-A4K.....................................                         1166                      2/22/96  L-26455-36A                                 
  O-360-B1B.....................................                         1262                       9/9/96  L-5261-51A                                  
  O-540-A1B5....................................                         1129                     12/29/95  ............................................
  O-540-A1B5....................................                         1132                       1/9/96  L-1165-40                                   
  O-540-A1D5....................................                         1462                      7/28/97  L-5661-40                                   
  IO-720........................................                         1510                     10/26/97  ............................................
  TIO-540-A2....................................                         1064                      7/13/95  ............................................
  TIO-540-A2....................................                         1111                      1/10/96  ............................................
  TIO-540-R2AD..................................                         1106                     11/27/95  L-5949-61A                                  
TCM:                                                                                                                                                    
  A-65..........................................                         1152                      1/25/96  ............................................
  A-65..........................................                         1154                      2/27/96  7187                                        
  A-65..........................................                         1183                      2/22/96  ............................................
  A-65..........................................                         1185                      3/28/96  ............................................
  A-65..........................................                         1233                      6/23/96  ............................................
  A-65..........................................                         1290                     10/29/96  ............................................
  A-65..........................................                         1296                     11/14/96  4933868                                     
  A-65..........................................                         1299                     11/19/96  ............................................
  A-65..........................................                         1325                      3/26/97  ............................................
  A-65..........................................                         1326                      3/26/97  ............................................
  A-65..........................................                         1376                      4/29/97  ............................................
  A-65..........................................                         1438                      6/17/97  5890178                                     
  A-65-3........................................                         1243                      8/13/96  324993                                      
  A-65-8........................................                         1541                      12/2/97  ............................................
  A-65-8........................................                         1276                      10/5/96  5762568                                     
  A75...........................................                         1156                       2/7/96  5321868                                     

[[Page 44550]]

                                                                                                                                                        
  A75...........................................                         1255                       9/3/96  ............................................
  A75...........................................                         1256                       9/4/96  ............................................
  A75-8.........................................                         1275                      10/5/96  5162868                                     
  C75-12F.......................................                         1293                      11/4/96  3316-6-12                                   
  C85...........................................                         1088                      10/4/95  ............................................
  C85...........................................                         1092                     10/18/95  ............................................
  C-85..........................................                         1198                      4/17/96  29652-7-8                                   
  C-85..........................................                         1297                     11/14/96  ............................................
  C-85..........................................                         1352                      3/10/97  ............................................
  C-85..........................................                         1381                      4/28/97  ............................................
  C-85..........................................                         1391                      4/19/97  ............................................
  C-85..........................................                         1392                      4/19/97  ............................................
  C-85..........................................                         1484                       9/4/97  28487-6-12                                  
  C-85-8FJ......................................                         1139                      1/17/96  29845-7-8                                   
  C-85-8FJ......................................                         1420                      5/12/97  29465-7-8                                   
  C-85-12.......................................                         1031                       4/6/95  ............................................
  C85-12........................................                         1182                      3/18/96  21596-6-12                                  
  C-85-12.......................................                         1217                      5/15/96  ............................................
  C85-12........................................                         1265                      9/12/96  14657                                       
  C-85-12.......................................                         1298                     11/14/96  23610-6-12                                  
  C-90-8F.......................................                         1471                       9/6/97  42838-1-8                                   
  C-90-12.......................................                         1279                      10/7/96  44747-6-12                                  
  E-185-4.......................................                         1124                      1/16/96  25700D-1-9                                  
  E-225-8.......................................                         1505                     10/28/97  35477-D-9-8-P                               
  GTSIO-520.....................................                         1208                       5/7/96  210114-70H                                  
  IO-360-C......................................                         1126                     12/28/95  F-51439-9-C                                 
  IO-470........................................                         1028                      3/23/95  87329-R                                     
  IO-470-N......................................                         1421                      5/13/97  95271-1-N                                   
  IO-470-S......................................                         1331                      3/11/97  102412-2-S-I                                
  IO-520........................................                         1174                       3/4/96  ............................................
  IO-520-D......................................                         1167                      2/22/96  ............................................
  O-200.........................................                         1033                      4/18/95  ............................................
  O-200.........................................                         1043                      5/12/95  ............................................
  O-200.........................................                         1049                       6/2/95  ............................................
  O-200.........................................                         1076                      9/11/95  214668-27A                                  
  O-200.........................................                         1104                     11/21/95  213830-71A                                  
  O-200.........................................                         1131                       1/5/96  ............................................
  O-200.........................................                         1142                      1/18/96  265349-R                                    
  O-200.........................................                         1147                      1/23/96  ............................................
  O-200.........................................                         1190                      4/13/96  ............................................
  O-200.........................................                         1193                      4/13/96  ............................................
  O-200.........................................                         1195                      4/13/96  ............................................
  O-200.........................................                         1197                      4/17/96  ............................................
  O-200.........................................                         1213                      5/13/96  ............................................
  O-200.........................................                         1261                       9/9/96  ............................................
  O-200.........................................                         1303                      12/5/96  ............................................
  O-200.........................................                         1321                       2/7/97  28115                                       
  O-200.........................................                         1324                       2/6/97  ............................................
  O-200.........................................                         1344                       3/2/97  ............................................
  O-200.........................................                         1393                       5/5/97  ............................................
  O-200.........................................                         1413                       5/7/97  61001-5-4                                   
  O-200.........................................                         1430                      5/23/97  ............................................
  O-200.........................................                         1437                      6/17/97  255759A-48                                  
  O-200.........................................                         1488                       9/7/97  ............................................
  O-200.........................................                         1506                     11/18/97  ............................................
  O-200.........................................                         1522                     11/11/97  ............................................
  O-200-A.......................................                         1052                      6/21/95  254150-A-48                                 
  O-200-A.......................................                         1085                      9/29/95  ............................................
  O-200-A.......................................                         1120                     12/29/95  253971                                      
  O-200-A.......................................                         1161                       2/9/96  24R-469                                     
  O-200-A.......................................                         1215                      5/15/96  ............................................
  O-200-A.......................................                         1240                       8/5/96  69589-8-A                                   
  O-200-A.......................................                         1254                       9/3/96  6105-71-A-R                                 
  O-200-A.......................................                         1264                      9/12/96  ............................................
  O-200-A.......................................                         1356                      3/10/97  ............................................
  O-300.........................................                         1027                      3/20/95  ............................................
  O-300.........................................                         1042                      5/12/95  34012-D-6-D                                 
  O-300.........................................                         1083                      9/26/95  ............................................
  O-300.........................................                         1096                     10/23/95  464481                                      
  O-300.........................................                         1137                      1/17/96  ............................................
  O-300.........................................                         1259                       9/4/96  ............................................
  O-300.........................................                         1387                      4/22/97  ............................................

[[Page 44551]]

                                                                                                                                                        
  O-300.........................................                         1397                      4/26/97  5928-9A                                     
  O-300.........................................                         1403                      4/28/97  ............................................
  O-300.........................................                         1423                       6/9/97  3834D8Z                                     
  O-300.........................................                         1555                      1/13/98  ............................................
  O-300-A.......................................                         1446                      6/27/97  ............................................
  O-300-D.......................................                         1022                      3/17/95  35110-D-6-D                                 
  O-300-D.......................................                         1079                      9/17/95  24276-D-0-D                                 
  O-300-D.......................................                         1487                       9/6/97  ............................................
  O-300-D.......................................                         1543                      12/3/97  ............................................
  O-470.........................................                         1046                       6/1/95  ............................................
  O-470.........................................                         1383                       4/4/97  ............................................
  O-470-11......................................                         1017                      2/22/95  ............................................
  O-470-11......................................                         1491                     10/19/97  ............................................
  O-470-11......................................                         1492                     10/19/97  ............................................
  O-470-11......................................                         1493                     10/19/97  ............................................
  O-470-11......................................                         1494                     10/19/97  ............................................
  O-470-F.......................................                         1236                      7/25/96  76956-4-F                                   
  O-470-K.......................................                         1087                      10/3/95  47172-6-K                                   
  O-470-L.......................................                         1128                      1/10/96  68681-8-L                                   
  O-470-L.......................................                         1359                      5/19/97  68245-8-L                                   
  O-470-L.......................................                         1399                      4/28/97  ............................................
  O-470-R.......................................                         1016                      2/10/95  133087-6-R                                  
  O-470-R.......................................                         1086                      10/3/95  ............................................
  O-470-R.......................................                         1165                      2/22/96  ............................................
  O-470-R.......................................                         1178                      3/10/96  ............................................
  O-470-R.......................................                         1201                       6/2/96  83164-1-R                                   
  O-470-R.......................................                         1319                       1/6/97  459408                                      
  TSIO-520-VB...................................                         1055                       6/9/95  ............................................
--------------------------------------------------------------------------------------------------------------------------------------------------------

    Note 1: Blank spaces indicate unknown data. Where the engine 
serial number is blank in this table, it is either unknown or the 
crankshaft may not be installed in an engine.
    Note 2: This airworthiness directive (AD) applies to each engine 
identified in the preceding applicability provision, regardless of 
whether it has been modified, altered, or repaired in the area 
subject to the requirements of this AD. For engines that have been 
modified, altered, or repaired so that the performance of the 
requirements of this AD is affected, the owner/operator must request 
approval for an alternative method of compliance in accordance with 
paragraph (c) of this AD. The request should include an assessment 
of the effect of the modification, alteration, or repair on the 
unsafe condition addressed by this AD; and, if the unsafe condition 
has not been eliminated, the request should include specific 
proposed actions to address it.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent crankshaft failure due to cracking, which could 
result in an inflight engine failure and possible forced landing, 
accomplish the following:
    (a) Within 10 hours time in service after the effective date of 
this AD, determine if this AD applies, as follows:
    (1) Determine if any repair was conducted on the engine that 
required crankshaft removal during the February 1, 1995, to December 
31, 1997, time frame; if the engine was not disassembled for 
crankshaft removal and repair in this time frame, no further action 
is required.
    (2) If the engine and crankshaft was repaired during this time 
frame, determine from the maintenance records (engine log book), and 
Table 1 of this AD if the crankshaft was repaired by Nelson 
Balancing Service, Repair Station Certificate No. NB7R820J, Bedford, 
Massachusetts. The maintenance records should contain the Return to 
Service (Yellow) tag for the crankshaft that will identify the 
company performing the repair. Also the work order number contained 
in Table 1 of this AD was etched on the crankshaft propeller flange, 
adjacent to the closest connecting rod journal. Because some etched 
numbers will be difficult to see, if necessary, use a 10X magnifying 
glass with an appropriate light source to view the work order 
number. In addition, the propeller spinner, if installed, will have 
to be removed in order to see this number.
    (3) A person with a private pilot or higher rated certificate 
may make the determination of applicability of this AD provided the 
propeller spinner does not have to be removed.
    (4) If it cannot be determined who repaired the crankshaft, 
compliance with this AD is required.
    (5) If the engine and crankshaft were not repaired during the 
time frame specified in (a)(1), or if it is determined that the 
crankshaft was not repaired by Nelson Balancing Service, no further 
action is required.
    (b) Within 10 hours time in service after the effective date of 
this AD, accomplish the following:
    (1) Perform a visual inspection as defined in paragraph (b)(2) 
of this AD, magnetic particle inspection, and a dimensional check of 
the crankshaft journals, or remove from service affected crankshafts 
and replace with serviceable parts.
    (2) For the purpose of this AD, a visual inspection of the 
crankshaft is defined as the inspection of all surfaces of the 
crankshaft for cracks which include heat check cracking of the 
nitrided bearing surfaces, cracking in the main or aft fillet of the 
main bearing journal and crankpin journal, including checking the 
bearing surfaces for scoring, galling, corrosion, or pitting.

    Note 3: Further guidance on all inspection and acceptance 
criteria is contained in applicable TCM or LYC Overhaul or 
Maintenance Manuals, or other FAA-approved data.

    (3) Replace any crankshaft that fails the visual inspection, 
magnetic particle inspection, or the dimensional check with a 
serviceable crankshaft, unless the crankshaft can be reworked to 
bring it in compliance with:
    (i) All the overhaul requirements of the appropriate TCM or LYC 
Overhaul/Maintenance Manuals; or
    (ii) All of the FAA-approved requirements for any repair station 
which currently has approval for limits other than those in the 
appropriate TCM or LYC Overhaul/Maintenance Manuals.
    (4) For the purpose of this AD, a serviceable crankshaft is one 
which meets the requirements of paragraph (b)(3)(i) or (b)(3)(ii) of 
this AD.

    Note 4: Crankshafts removed from TCM engine models IO-360, IO-
520, and TSIO-520 series engines are also subject to compliance with 
AD 97-26-17.

    (c) An alternative method of compliance or adjustment of the 
compliance time that

[[Page 44552]]

provides an acceptable level of safety may be used if approved by 
the Manager, New York (LYC) or Atlanta (TCM) Aircraft Certification 
Offices. Operators shall submit their requests through an 
appropriate FAA Airworthiness Inspector, who may add comments and 
then send it to the Manager, New York or Atlanta Aircraft 
Certification Offices.

    Note 5: Information concerning the existence of approved 
alternative methods of compliance with this airworthiness directive, 
if any, may be obtained from the Atlanta Aircraft Certification or 
New York Aircraft Certification Office, as applicable.

    (d) Special flight permits may be issued in accordance with 
sections 21.197 and 21.199 of the Federal Aviation Regulations (14 
CFR 21.197 and 21.199) to operate the aircraft to a location where 
the requirements of this AD can be accomplished.
    (e) This amendment becomes effective on October 19, 1998.

    Issued in Burlington, Massachusetts, on August 11, 1998.
Jay J. Pardee,
Manager, Engine and Propeller Directorate, Aircraft Certification 
Service.
[FR Doc. 98-22240 Filed 8-19-98; 8:45 am]
BILLING CODE 4910-13-M