[Federal Register Volume 63, Number 15 (Friday, January 23, 1998)]
[Proposed Rules]
[Pages 3483-3491]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-1483]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 97-ANE-45-AD]
RIN 2120-AA64
Airworthiness Directives; Pratt & Whitney JT8D Series Turbofan
Engines
AGENCY: Federal Aviation Administration, DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: This document proposes the adoption of a new airworthiness
directive (AD) that is applicable to Pratt & Whitney JT8D series
turbofan engines. This proposal would require a one-time visual and
eddy current inspection of certain stage 3-4 low pressure compressor
(LPC) disks and stage 7-12 high pressure compressor (HPC) disks
identified by part number and serial number, for arc burns in tie rod,
shielding, and pressure balance holes, and, if necessary, repair of tie
rod holes. This proposal is prompted by reports of improper fixturing
during the electrolytic cleaning process of certain compressor disks at
a certified repair station, Avial, currently Greenwich Air Services
Inc., certificate number RA1R445K of Dallas, Texas, that can result in
damage to the disks in the form of arc burns. The actions specified by
the proposed AD are intended to prevent compressor disk cracking from
arc burns in tie rod holes, shielding holes, or pressure balance holes,
which could lead to a fracture of a compressor disk, resulting in
uncontained release of engine fragments, inflight engine shutdown, and
airframe damage.
DATES: Comments must be received by February 23, 1998.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), New England Region, Office of the Regional
Counsel, Attention: Rules Docket No. 97-ANE-45-AD, 12 New England
Executive Park, Burlington, MA 01803-5299. Comments may also be sent
via the Internet using the following address: ``9-ad-
[email protected]''. Comments sent via the Internet must contain
the docket number in the subject line. Comments may be inspected at
this location between 8:00 a.m. and 4:30 p.m., Monday through Friday,
except Federal holidays.
The service information referenced in the proposed rule may be
obtained from Greenwich Air Services, 9311 Reeves Street, Dallas TX
75235-2095; telephone (214) 956-5310, fax (214) 956-5523. This
information may be examined at the FAA, New England Region, Office of
the Regional Counsel, 12 New England Executive Park, Burlington, MA.
FOR FURTHER INFORMATION CONTACT: Christopher Spinney, Aerospace
Engineer, Engine Certification Office, FAA, Engine and Propeller
Directorate, 12 New England Executive Park, Burlington, MA 01803-5299;
telephone (781) 238-7175, fax (781) 238-7199.
SUPPLEMENTARY INFORMATION:
Comments Invited
Interested persons are invited to participate in the making of the
proposed rule by submitting such written data, views, or arguments as
they may desire. Communications should identify the Rules Docket number
and be submitted in triplicate to the address specified above. All
communications received on or before
[[Page 3484]]
the closing date for comments, specified above, will be considered
before taking action on the proposed rule. The proposals contained in
this notice may be changed in light of the comments received.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the proposed rule. All
comments submitted will be available, both before and after the closing
date for comments, in the Rules Docket for examination by interested
persons. A report summarizing each FAA-public contact concerned with
the substance of this proposal will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this notice must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket Number 97-ANE-45-AD.'' The postcard will be date stamped and
returned to the commenter.
Availability of NPRMs
Any person may obtain a copy of this NPRM by submitting a request
to the FAA, New England Region, Office of the Regional Counsel,
Attention: Rules Docket No. 97-ANE-45-AD, 12 New England Executive
Park, Burlington, MA 01803-5299.
Discussion
The Federal Aviation Administration (FAA) received a report of
certain low pressure compressor (LPC) and high pressure compressor
(HPC) disks, installed on Pratt & Whitney (PW) JT8D series turbofan
engines, that were improperly fixtured during the electrolytic cleaning
process at a certain repair station. This improper fixturing can lead
to damage to compressor disks in the form of arc burns. Arc burns can
degrade disk material properties and create a stress concentration that
results in premature cracking of a disk and subsequent failure. This
condition, if not corrected, could result in compressor disk cracking
from arc burns in tie rod holes, shielding holes, or pressure balance
holes, which could lead to a fracture of a compressor disk, resulting
in uncontained release of engine fragments, inflight engine shutdown,
and airframe damage.
A metallurgical laboratory procedure and a new highly sensitive
eddy current inspection technique have been developed to identify arc-
burn defects. Because the inspections and repair require
familiarization with newly developed techniques and require facilities,
equipment and personnel outside the scope of a typical repair facility,
the FAA has determined that only the facility named in the AD are
currently approved to perform the required inspections and repairs.
Operators who desire to use another facility must apply for approval
using the alternate method of compliance procedure provided in
paragraph (d) of the AD.
The FAA has reviewed and approved the technical contents of
Greenwich Air Services Technical Instruction (TI) 885 dated, October
20, 1997, that describes procedures for visual and eddy current
inspections and repairs for compressor disks which have been exposed to
the potential of arc burn.
Since an unsafe condition has been identified that is likely to
exist or develop on other products of this same type design, the
proposed AD would require, at the next shop visit after the effective
date of this AD, a one-time visual and eddy current inspection of
compressor disks to detect arc burn damage and if appropriate, repair
of damaged area. The actions would be required to be accomplished in
accordance with the technical instruction described previously.
There are a total of 1,388 compressor disks exposed to improper
fixturing during the electrolytic cleaning process. The FAA estimates
that 1,054 of these disks currently remain in service in the worldwide
fleet, which represents approximately 210 engines. The FAA also
estimates that 840 of the disks affected by the proposed AD are
installed in engines installed on aircraft of U.S. registry. It will
take approximately 30 work hours to accomplish the proposed actions per
disk, and that the average labor rate is $60 per work hour. Required
parts would cost approximately $23 per disk. Based on these figures,
the total cost impact of the proposed AD on U.S. operators is estimated
to be $1,531,320.
The regulations proposed herein would 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
proposal would not have sufficient federalism implications to warrant
the preparation of a Federalism Assessment.
For the reasons discussed above, I certify that this proposed
regulation (1) is not a ``significant regulatory action'' under
Executive Order 12866; (2) is not a ``significant rule'' under the DOT
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979);
and (3) if promulgated, 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 copy of the draft
regulatory evaluation prepared for this action is contained in the
Rules Docket. A copy of it may be obtained by contacting 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.
The Proposed Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration proposes to amend
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:
Pratt & Whitney: Docket No. 97-ANE-45-AD.
Applicability: Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -
7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, -17AR, -209, -217, -
217A, -217C, and -219 model turbofan engines which have a compressor
disk installed identified by part number and serial number in Table
1 of this AD. These engines are installed on but not limited to
Boeing 727 and 737 series, and McDonnell Douglas DC-9 and MD80
series aircraft.
Note 1: 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 (d) 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 compressor disk cracking from arc burns in tie rod
holes, shielding holes, or pressure balance holes, which could lead
to a fracture of a compressor disk, resulting in uncontained release
of engine fragments,
[[Page 3485]]
inflight engine shutdown, and airframe damage, accomplish the
following:
(a) At the next shop visit after the effective date of this AD,
remove, visually inspect, eddy current inspect, and repair or
replace with a serviceable part disks identified by part number and
serial number in Table 1 of this AD in accordance with Greenwich Air
Services Technical Instruction (TI) 885, dated October 20, 1997.
Table 1
------------------------------------------------------------------------
Stage P/N S/N
------------------------------------------------------------------------
3................................ 745803 H13469
3................................ 745803 N48096
3................................ 745803 N48361
3................................ 745803 P77936
3................................ 745803 P77942
3................................ 745803 P78298
3................................ 745803 P98041
3................................ 745803 P98334
3................................ 745803 R18766
3................................ 745803 R18989
3................................ 745803 R19227
3................................ 745803 R73555
3................................ 745803 R74156
4................................ 745704 2A3332
4................................ 745704 2A4258
4................................ 745704 G51920
4................................ 745704 H04195
4................................ 745704 J46788
4................................ 745704 J76639
4................................ 745704 K11388
4................................ 745704 K11483
4................................ 745704 K12946
4................................ 745704 K52509
4................................ 745704 K53069
4................................ 745704 L60864
4................................ 745704 L61145
4................................ 777704 B114AA0034
4................................ 777704 B114AA0178
4................................ 777704 B114AA0274
4................................ 777704 BBDUA14597
4................................ 777704 BBDUAH4675
4................................ 777704 BBDUAH7390
4................................ 777704 J77499
4................................ 777704 J94590
4................................ 777704 K43182
4................................ 777704 L81216
4................................ 777704 L81217
4................................ 777704 L81218
4................................ 777704 L81224
4................................ 777704 L81688
4................................ 777704 M40670
4................................ 777704 M44376
4................................ 777704 M44384
4................................ 777704 M53723
4................................ 777704 M53753
4................................ 777704 M53810
4................................ 777704 M53815
4................................ 777704 N30898
4................................ 777704 N30938
4................................ 777704 N30943
4................................ 777704 N30947
4................................ 777704 N30956
4................................ 777704 N53261
4................................ 777704 N53280
4................................ 777704 N53284
4................................ 777704 N53290
4................................ 777704 N53296
4................................ 777704 N53299
4................................ 777704 N53309
4................................ 777704 N53317
4................................ 777704 N53324
4................................ 777704 N53337
4................................ 777704 N53340
4................................ 777704 N53347
4................................ 777704 N53355
4................................ 777704 N53356
4................................ 777704 N53361
4................................ 777704 N53364
4................................ 777704 N53366
4................................ 777704 N53373
4................................ 777704 N53388
4................................ 777704 N53390
4................................ 777704 N53392
4................................ 777704 N53397
4................................ 777704 N53402
4................................ 777704 N53405
4................................ 777704 N53407
4................................ 777704 N53409
4................................ 777704 N53411
4................................ 777704 N53413
4................................ 777704 N53416
4................................ 777704 N53419
4................................ 777704 N53426
4................................ 777704 N53434
4................................ 777704 N53437
4................................ 777704 N53438
4................................ 777704 N53449
4................................ 777704 N63635
4................................ 777704 N63637
4................................ 777704 N63646
4................................ 777704 N63651
4................................ 777704 N63696
4................................ 777704 N63704
4................................ 777704 N63718
4................................ 777704 N63736
4................................ 777704 N63740
4................................ 777704 N63745
4................................ 777704 N63803
4................................ 777704 P50018
4................................ 777704 P50025
4................................ 777704 P50036
4................................ 777704 P50050
4................................ 777704 P50054
4................................ 777704 P50083
4................................ 777704 P63990
4................................ 777704 R21906
4................................ 777704 R21930
4................................ 777704 R21985
4................................ 777704 R21991
4................................ 777704 R41366
4................................ 777704 R42431
4................................ 777704 R56904
4................................ 777704 R56911
4................................ 777704 R56932
4................................ 777704 R56948
4................................ 777704 R75603
4................................ 777704 R75635
4................................ 777704 R75644
4................................ 777704 S28269
4................................ 777704 S28335
4................................ 777704 S28336
4................................ 777704 S65405
4................................ 777704 S65417
4................................ 777704 S87903
4................................ 777704 S91630
4................................ 777704 T00466
4................................ 777704 T48099
4................................ 777704 T48101
4................................ 777704 T48105
4................................ 799504 K23796
4................................ 799504 L61578
4................................ 799504 L61597
4................................ 799504 L89794
4................................ 799504 M77214
4................................ 799504 N06109
4................................ 799504 N06248
4................................ 799504 N06731
4................................ 799504 N06908
4................................ 799504 N06911
4................................ 799504 N32484
4................................ 799504 N32493
4................................ 799504 N32514
4................................ 799504 N33627
4................................ 799504 N33880
4................................ 799504 N34238
4................................ 799504 N89280
4................................ 799504 N89817
4................................ 799504 N90599
4................................ 799504 N90812
4................................ 799504 N90849
4................................ 799504 P45299
4................................ 799504 P45435
4................................ 799504 R23598
4................................ 799504 R23753
4................................ 799504 R24022
4................................ 799504 R24310
4................................ 799504 R24543
4................................ 799504 S07095
4................................ 799504 S07147
4................................ 799504 S07164
4................................ 799504 S07250
4................................ 799504 S58162
4................................ 799504 S58237
4................................ 799504 T02774
4................................ 799504 T02897
4................................ 799504 T03020
4................................ 799504 T03027
4................................ 799504 T03038
4................................ 799504 T03047
7................................ 701407 7Z5379
7................................ 766007 G11181
7................................ 774407 B207AA0057
7................................ 774407 B207AA0164
7................................ 774407 B207AA0224
7................................ 774407 B207AA0270
7................................ 774407 B207AA0546
7................................ 774407 B207AA0719
7................................ 774407 B207AA0757
7................................ 774407 B207AA0768
7................................ 774407 B207AA0775
7................................ 774407 B207AA0913
7................................ 774407 BENCAH1914
7................................ 774407 BENCAH4273
7................................ 774407 BENCAJ5690
7................................ 774407 BENCAK1601
7................................ 774407 BENCAK5082
7................................ 774407 BENCAK5701
7................................ 774407 BENCAK6044
7................................ 774407 BENCAK6586
7................................ 774407 G78791
7................................ 774407 H19147
7................................ 774407 H75592
7................................ 774407 J08985
7................................ 774407 J17315
7................................ 774407 J17370
7................................ 774407 J72117
7................................ 774407 J93428
7................................ 774407 J93669
7................................ 774407 K78068
7................................ 774407 K78149
7................................ 774407 K78378
7................................ 774407 L23953
7................................ 774407 L71885
7................................ 774407 L71922
7................................ 774407 L72170
[[Page 3486]]
7................................ 774407 L72261
7................................ 774407 M38646
7................................ 774407 M44626
7................................ 774407 M60192
7................................ 774407 M78767
7................................ 774407 M83783
7................................ 774407 M93487
7................................ 774407 M93549
7................................ 774407 N24007
7................................ 774407 N24131
7................................ 774407 N58891
7................................ 774407 N58905
7................................ 774407 N59040
7................................ 774407 N70414
7................................ 774407 N88273
7................................ 774407 N88281
7................................ 774407 N88306
7................................ 774407 N93477
7................................ 774407 N95003
7................................ 774407 P14688
7................................ 774407 P14851
7................................ 774407 P16547
7................................ 774407 P35320
7................................ 774407 P35374
7................................ 774407 P35475
7................................ 774407 P54474
7................................ 774407 P54594
7................................ 774407 P60383
7................................ 774407 P60383
7................................ 774407 P81375
7................................ 774407 P81382
7................................ 774407 P86353
7................................ 774407 R19478
7................................ 774407 R31305
7................................ 774407 R37450
7................................ 774407 R46879
7................................ 774407 R46934
7................................ 774407 R57593
7................................ 774407 R57744
7................................ 774407 R57769
7................................ 774407 R72169
7................................ 774407 R72236
7................................ 774407 R81458
7................................ 774407 R81507
7................................ 774407 R81527
7................................ 774407 R81612
7................................ 774407 R90895
7................................ 774407 S05652
7................................ 774407 S13843
7................................ 774407 S14099
7................................ 774407 S14103
7................................ 774407 S36805
7................................ 774407 S36885
7................................ 774407 S36896
7................................ 774407 S36994
7................................ 774407 S36995
7................................ 774407 S37166
7................................ 774407 S37554
7................................ 774407 T04613
7................................ 774407 T04687
7................................ 774407 T04739
7................................ 774407 T04806
7................................ 774407 T04812
7................................ 774407 T04814
7................................ 774407 T04837
7................................ 774407 T04843
7................................ 774407 T04885
7................................ 774407 T04903
7................................ 774407 T04960
7................................ 774407 T05000
7................................ 774407 T05108
7................................ 5006007-02 BENCAK9696
7................................ 5006007-02 BENCAK9900
7................................ 5006007-02 BENCAL0760
7................................ 5006007-02 BENCAL1937
7................................ 5006007-02 BENCAL4577
7................................ 5006007-02 BENCAL5766
7................................ 5006007-01 AA0297
7................................ 5006007-01 B207AA0069
7................................ 5006007-01 B207AA0135
7................................ 5006007-01 B207AA0155
7................................ 5006007-01 B207AA0172
7................................ 5006007-01 B207AA0177
7................................ 5006007-01 B207AA0354
7................................ 5006007-01 B207AA0355
7................................ 5006007-01 B207AA0421
7................................ 5006007-01 B207AA0493
7................................ 5006007-01 B207AA0533
7................................ 5006007-01 B207AA0571
7................................ 5006007-01 B207AA0684
7................................ 5006007-01 B207AA0756
7................................ 5006007-01 B207AA0811
7................................ 5006007-01 BENCAH3454
7................................ 5006007-01 BENCAH4003
7................................ 5006007-01 BENCAH4004
7................................ 5006007-01 BENCAH4371
7................................ 5006007-01 BENCAH4373
7................................ 5006007-01 BENCAH4794
7................................ 5006007-01 BENCAH4797
7................................ 5006007-01 BENCAH5400
7................................ 5006007-01 BENCAH5401
7................................ 5006007-01 BENCAJ8559
7................................ 5006007-01 BENCAJ8585
7................................ 5006007-01 BENCAJ8614
7................................ 5006007-01 BENCAJ8626
7................................ 5006007-01 BENCAJ8656
7................................ 5006007-01 BENCAJ9106
7................................ 5006007-01 BENCAK5959
7................................ 5006007-01 BENCAK5963
7................................ 5006007-01 BENCAK9770
7................................ 5006007-01 BENCAK9771
7................................ 5006007-01 BENCAL2683
7................................ 5006007-01 BENCAL3622
7................................ 5006007-01 BENCAL3931
7................................ 5006007-01 K20260
7................................ 5006007-01 K20499
7................................ 5006007-01 K20543
7................................ 5006007-01 N09043
7................................ 5006007-01 N65077
7................................ 5006007-01 N65107
7................................ 5006007-01 N65132
7................................ 5006007-01 N93173
7................................ 5006007-01 N93193
7................................ 5006007-01 P23185
7................................ 5006007-01 P23236
7................................ 5006007-01 P49794
7................................ 5006007-01 P49835
7................................ 5006007-01 P92551
7................................ 5006007-01 P92580
7................................ 5006007-01 R12660
7................................ 5006007-01 R12670
7................................ 5006007-01 R12710
7................................ 5006007-01 R35504
7................................ 5006007-01 R35530
7................................ 5006007-01 R36545
7................................ 5006007-01 R43821
7................................ 5006007-01 R54576
7................................ 5006007-01 R54634
7................................ 5006007-01 R79460
7................................ 5006007-01 R79466
7................................ 5006007-01 R92415
7................................ 5006007-01 R92431
7................................ 5006007-01 R92435
7................................ 5006007-01 R92442
7................................ 5006007-01 S11034
7................................ 5006007-01 S11058
7................................ 5006007-01 S11154
7................................ 5006007-01 S11156
7................................ 5006007-01 S11179
7................................ 5006007-01 S11182
7................................ 5006007-01 S11186
7................................ 5006007-01 S11202
7................................ 5006007-01 S11206
7................................ 5006007-01 S56884
7................................ 5006007-01 S56888
7................................ 5006007-01 S56998
7................................ 5006007-01 S57073
7................................ 5006007-01 S57075
7................................ 5006007-01 S57117
7................................ 5006007-01 S57120
7................................ 5006007-01 S57156
7................................ 5006007-01 S57157
7................................ 5006007-01 S57192
7................................ 5006007-01 S57220
7................................ 5006007-01 S57332
7................................ 5006007-01 S57354
7................................ 5006007-01 S57405
7................................ 5006007-01 S57412
7................................ 5006007-01 S57420
7................................ 5006007-01 S57424
7................................ 5006007-01 S57437
7................................ 5006007-01 S57452
7................................ 5006007-01 S57467
7................................ 5006007-01 S57470
7................................ 5006007-01 S57589
8................................ 748608 B208AA0043
8................................ 748608 BENCAK1564
8................................ 748608 H50069
8................................ 748608 H64474
8................................ 748608 H64605
8................................ 748608 J57591
8................................ 748608 J94824
8................................ 748608 M54652
8................................ 748608 M54835
8................................ 748608 N14526
8................................ 748608 N84300
8................................ 748608 P-28517
8................................ 748608 P26161
8................................ 748608 P28493
8................................ 748608 P28504
8................................ 748608 P28505
8................................ 748608 P28511
8................................ 748608 P28542
8................................ 748608 P28614
8................................ 748608 P98885
8................................ 748608 S01079
8................................ 748608 S01090
8................................ 748608 S50742
8................................ 748608 S78049
8................................ 748608 S78056
8................................ 748608 S78100
8................................ 787008 J76875
8................................ 787008 K12869
8................................ 787008 M77087
8................................ 787008 N06806
8................................ 787008 N32406
8................................ 787008 N34151
8................................ 787008 N89336
8................................ 787008 N89554
8................................ 787008 N90392
8................................ 787008 N90682
8................................ 787028 N89693
8................................ 787208 AA0676
8................................ 787208 B07691
8................................ 787208 B228AA0169
8................................ 787208 B228AA0242
[[Page 3487]]
8................................ 787208 B228AA0288
8................................ 787208 B228AA0389
8................................ 787208 B228AA0426
8................................ 787208 B228AA0537
8................................ 787208 B228AA0576
8................................ 787208 B228AA0638
8................................ 787208 B228AA0641
8................................ 787208 B228AA0746
8................................ 787208 B228AA0859
8................................ 787208 B228AA0866
8................................ 787208 B228AA0878
8................................ 787208 B228AA0905
8................................ 787208 B228AA1070
8................................ 787208 B228AA1117
8................................ 787208 BENCAH0302
8................................ 787208 BENCAH1584
8................................ 787208 BENCAH3448
8................................ 787208 BENCAJ5729
8................................ 787208 BENCAJ8175
8................................ 787208 BENCAJ8767
8................................ 787208 BENCAJ8773
8................................ 787208 BENCAJ8790
8................................ 787208 BENCAJ9142
8................................ 787208 BENCAK4678
8................................ 787208 BENCAK4771
8................................ 787208 BENCAK5470
8................................ 787208 BENCAK6156
8................................ 787208 BENCAK6162
8................................ 787208 BENCAK6398
8................................ 787208 BENCAK8259
8................................ 787208 BENCAK9252
8................................ 787208 BENCAK9261
8................................ 787208 BENCAL2604
8................................ 787208 BENCAL2642
8................................ 787208 BENCAL4344
8................................ 787208 BENCAL7699
8................................ 787208 BENCAL9217
8................................ 787208 J76954
8................................ 787208 K11762
8................................ 787208 K12737
8................................ 787208 K12765
8................................ 787208 L89874
8................................ 787208 M41582
8................................ 787208 M41586
8................................ 787208 M41918
8................................ 787208 M76995
8................................ 787208 M77005
8................................ 787208 M77119
8................................ 787208 N06396
8................................ 787208 N33501
8................................ 787208 N33769
8................................ 787208 N33774
8................................ 787208 N33776
8................................ 787208 N33784
8................................ 787208 N34183
8................................ 787208 N34207
8................................ 787208 N89068
8................................ 787208 N89079
8................................ 787208 N89082
8................................ 787208 N89087
8................................ 787208 N89089
8................................ 787208 N89404
8................................ 787208 N89409
8................................ 787208 N89699
8................................ 787208 N89702
8................................ 787208 N89708
8................................ 787208 N89895
8................................ 787208 N89898
8................................ 787208 N90251
8................................ 787208 N90344
8................................ 787208 N90990
8................................ 787208 P43853
8................................ 787208 P43872
8................................ 787208 P43891
8................................ 787208 P43956
8................................ 787208 P43986
8................................ 787208 P44338
8................................ 787208 P45405
8................................ 787208 R23233
8................................ 787208 R23836
8................................ 787208 R23873
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(b) For the purpose of this AD, a shop visit is defined as an
engine removal, where engine maintenance entails separation of pairs of
major mating engine flanges or the removal of a disk, hub, or spool
regardless of other planned maintenance.
(c) The accomplishment of the inspections and repairs specified in
this AD must be performed at Greenwich Air Services Inc., certificate
number RA1R445K of Dallas, Texas. Operators wishing to use another
facility to perform the required inspections and repairs must apply for
an alternate method of compliance in accordance with paragraph (d) of
this AD.
(d) An alternative method of compliance or adjustment of the
compliance time that provides an acceptable level of safety may be used
if approved by the Manager, Engine Certification Office. Operators
shall submit their request through an appropriate FAA Principal
Maintenance Inspector, who may add comments and then send it to the
Manager, Engine Certification Office.
Note 2: Information concerning the existence of approved
alternative methods of compliance with this airworthiness directive, if
any, may be obtained from the Engine Certification Office.
(e) 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
inspection requirements of this AD can be accomplished.
Issued in Burlington, Massachusetts, on January 8, 1998.
James C. Jones,
Assistant Manager, Engine and Propeller Directorate, Aircraft
Certification Service.
[FR Doc. 98-1483 Filed 1-22-98; 8:45 am]
BILLING CODE 4910-13-U