[Federal Register Volume 63, Number 94 (Friday, May 15, 1998)] [Proposed Rules] [Pages 27002-27011] From the Federal Register Online via the Government Publishing Office [www.gpo.gov] [FR Doc No: 98-12918] ----------------------------------------------------------------------- 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. [[Page 27003]] ACTION: Supplemental notice of proposed rulemaking; reopening of comment period. ----------------------------------------------------------------------- SUMMARY: This document revises an earlier proposed airworthiness directive (AD), applicable to Pratt & Whitney JT8D series turbofan engines, that would have required 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. That proposal was prompted by reports of improper fixturing during the electrolytic cleaning process of certain compressor disks at a certified repair station, Avial or Greenwich Air Services, currently GE Engine Services Dallas LP, certificate number RA1R445K of Dallas, Texas, that can result in damage to the disks in the form of arc burns. This action revises the proposed rule by adding a drawdown schedule for removal of affected disks. The actions specified by this 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 July 14, 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 GE Engine Services--Dallas LP, 9311 Reeves St., Dallas, TX 75235-2095. 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 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 A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to add an airworthiness directive (AD), applicable to Pratt & Whitney (PW) JT8D series turbofan engines, was published as a notice of proposed rulemaking (NPRM) in the Federal Register on January 22,1998 (63 FR 3483). That NPRM would have required, at the next shop visit after the effective date of the AD, a one-time visual and eddy current inspection of compressor disks to detect arc burn damage and if appropriate, repair of damaged area. That NPRM was prompted by a report of certain low pressure compressor (LPC) and high pressure compressor (HPC) disks, installed on PW JT8D series turbofan engines, that were improperly fixtured during the electrolytic cleaning process at a certain repair station. That 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. That 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. Since the issuance of that NPRM, the FAA received a comment from the manufacturer stating that a drawdown schedule for removal of affected disks should be added to the proposed rule to maintain an acceptable level of safety, instead of requiring the inspection at the next shop visit. The FAA concurs and has added a drawdown schedule of 3,000 cycles in service (CIS) after the effective date of this AD, or the next shop visit, whichever occurs first. Since this change expands the scope of the originally proposed rule, the FAA has determined that it is necessary to reopen the comment period to provide additional opportunity for public comment. 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. [[Page 27004]] 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 airworthiness directive (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 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 (e) 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, inflight engine shutdown, and airframe damage, accomplish the following: (a) Within 3,000 cycles in service (CIS) after the effective date of this AD, or the next shop visit, whichever occurs first, remove, visually inspect, eddy current inspect, and repair or replace with a serviceable part disks identified by part number (P/ N) and serial number (S/N) in Table 1 of this AD in accordance with GE Engine Services--Dallas, LP, Engineering Bulletin (EB) JT8D-025, dated March 27, 1998. The next shop visit must occur by [insert 10 years from AD effective date]. 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 [[Page 27005]] 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 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............................... 5006007-02 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 [[Page 27006]] 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 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 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12.............................. 772512 J89283 12.............................. 772512 K04097 12.............................. 772512 K23952 12.............................. 772512 K23992 12.............................. 772512 K35819 12.............................. 772512 K55628 12.............................. 772512 K55951 12.............................. 772512 K56079 12.............................. 772512 K66470 12.............................. 772512 K66500 12.............................. 772512 K86442 12.............................. 772512 K86447 12.............................. 772512 L15502 12.............................. 772512 L30899 12.............................. 772512 L31589 12.............................. 772512 L32003 12.............................. 772512 L56276 12.............................. 772512 L56294 12.............................. 772512 L56303 12.............................. 772512 L56308 12.............................. 772512 L56886 12.............................. 772512 L85095 12.............................. 772512 L86236 12.............................. 772512 M10233 12.............................. 772512 M10966 12.............................. 772512 M40081 12.............................. 772512 M49574 12.............................. 772512 M49665 12.............................. 772512 M73392 12.............................. 772512 M84838 12.............................. 772512 N02466 12.............................. 772512 N03990 12.............................. 772512 N21261 12.............................. 772512 N22069 12.............................. 772512 N22894 12.............................. 772512 N41128 12.............................. 772512 N41249 12.............................. 772512 N41717 12.............................. 772512 N42236 12.............................. 772512 N42871 12.............................. 772512 N56325 12.............................. 772512 N57451 [[Page 27010]] 12.............................. 772512 N58072 12.............................. 772512 N58127 12.............................. 772512 N80601 12.............................. 772512 N81044 12.............................. 772512 N81173 12.............................. 772512 N81187 12.............................. 772512 N97079 12.............................. 772512 N97083 12.............................. 772512 N97109 12.............................. 772512 N97384 12.............................. 772512 N97438 12.............................. 772512 N97455 12.............................. 772512 N97457 12.............................. 772512 N97893 12.............................. 772512 N97916 12.............................. 772512 N98152 12.............................. 772512 N98162 12.............................. 772512 N98654 12.............................. 772512 N98657 12.............................. 772512 N98680 12.............................. 772512 N98691 12.............................. 772512 N99016 12.............................. 772512 N99025 12.............................. 772512 N99049 12.............................. 772512 N99057 12.............................. 772512 N99094 12.............................. 772512 N99125 12.............................. 772512 P11154 12.............................. 772512 P11179 12.............................. 772512 P11183 12.............................. 772512 P11193 12.............................. 772512 P11252 12.............................. 772512 P11678 12.............................. 772512 P11699 12.............................. 772512 P11877 12.............................. 772512 P11879 12.............................. 772512 P11909 12.............................. 772512 P12244 12.............................. 772512 P12277 12.............................. 772512 P12493 12.............................. 772512 P12519 12.............................. 772512 P51414 12.............................. 772512 P52139 12.............................. 772512 P52409 12.............................. 772512 P52520 12.............................. 772512 P52871 12.............................. 772512 P53141 12.............................. 772512 P53351 12.............................. 772512 P53396 12.............................. 772512 P72298 12.............................. 772512 P76702 12.............................. 772512 P76921 12.............................. 772512 P76931 12.............................. 772512 P77096 12.............................. 772512 P77294 12.............................. 772512 P77338 12.............................. 772512 P77695 12.............................. 772512 P77796 12.............................. 772512 P78510 12.............................. 772512 P97315 12.............................. 772512 R17703 12.............................. 772512 R17746 12.............................. 772512 R18201 12.............................. 772512 R18319 12.............................. 772512 R18589 12.............................. 772512 R19042 12.............................. 772512 R45067 12.............................. 772512 R45829 12.............................. 772512 R46100 12.............................. 772512 R46108 12.............................. 772512 R46121 12.............................. 772512 R46707 12.............................. 772512 R52615 12.............................. 772512 R72811 12.............................. 772512 R73024 12.............................. 772512 R73783 12.............................. 772512 R74357 12.............................. 772512 S01858 12.............................. 772512 S01860 12.............................. 772512 S01914 12.............................. 772512 S01923 12.............................. 772512 S01949 12.............................. 772512 S01969 12.............................. 772512 S01971 12.............................. 772512 S01980 12.............................. 772512 S01994 12.............................. 772512 S02002 12.............................. 772512 S02007 12.............................. 772512 S19593 12.............................. 772512 S19644 12.............................. 772512 S19843 12.............................. 772512 S51370 12.............................. 772512 S51437 12.............................. 772512 S51514 12.............................. 772512 S51519 12.............................. 772512 S51560 12.............................. 772512 S51571 12.............................. 772512 S78825 12.............................. 772512 S78841 12.............................. 798512 B212AA0009 12.............................. 798512 B212AA0045 12.............................. 798512 B212AA0051 12.............................. 798512 B212AA0060 12.............................. 798512 B212AA0073 12.............................. 798512 B212AA0077 12.............................. 798512 B212AA0082 12.............................. 798512 B212AA0142 12.............................. 798512 B212AA0155 12.............................. 798512 B212AA0290 12.............................. 798512 B212AA0293 12.............................. 798512 B212AA0361 12.............................. 798512 B212AA0428 12.............................. 798512 B212AA0586 12.............................. 798512 B212AA0618 12.............................. 798512 B212AA0647 12.............................. 798512 B212AA0735 12.............................. 798512 B212AA0747 12.............................. 798512 B212AA0942 12.............................. 798512 B212AA0974 12.............................. 798512 B212AA1031 12.............................. 798512 B212AA1062 12.............................. 798512 B212AA1098 12.............................. 798512 B212AA1173 12.............................. 798512 BENCAH1931 12.............................. 798512 BENCAH4104 12.............................. 798512 BENCAJ4925 12.............................. 798512 BENCAJ6158 12.............................. 798512 BENCAJ7821 12.............................. 798512 BENCAJ8115 12.............................. 798512 BENCAJ9478 12.............................. 798512 BENCAJ9497 12.............................. 798512 BENCAJ9503 12.............................. 798512 BENCAJ9530 12.............................. 798512 BENCAJ9617 12.............................. 798512 BENCAJ9673 12.............................. 798512 BENCAK0455 12.............................. 798512 BENCAK2377 12.............................. 798512 BENCAK4552 12.............................. 798512 BENCAK5787 12.............................. 798512 BENCAK8605 12.............................. 798512 BENCAK9227 12.............................. 798512 BENCAL1655 12.............................. 798512 BENCAL2487 12.............................. 798512 BENCAL4173 12.............................. 798512 BENCAL6328 12.............................. 798512 BENCAL6602 12.............................. 798512 M86993 12.............................. 798512 N42703 12.............................. 798512 N42708 12.............................. 798512 N57617 12.............................. 798512 N57629 12.............................. 798512 N80087 12.............................. 798512 N80088 12.............................. 798512 N98138 12.............................. 798512 N99136 12.............................. 798512 N99144 12.............................. 798512 P53305 12.............................. 798512 P76909 12.............................. 798512 P76916 12.............................. 798512 P77722 12.............................. 798512 P78317 12.............................. 798512 R17334 12.............................. 798512 R46556 12.............................. 798512 R46562 12.............................. 798512 R73201 12.............................. 798512 R74214 12.............................. 798512 S02217 12.............................. 798512 S02254 12.............................. 798512 S51853 12.............................. 798512 S79575 12.............................. 798512 S94530 12.............................. 798512 S94534 12.............................. 798512 S94538 12.............................. 798512 S94539 12.............................. 798512 S94569 12.............................. 798512 S94579 12.............................. 798512 S94590 12.............................. 798512 S94615 12.............................. 798512 T19187 12.............................. 798512 T19213 12.............................. 798512 T19220 12.............................. 798512 T19242 12.............................. 798512 T19277 12.............................. 798512 T19292 12.............................. 798512 T19314 12.............................. 798512 T28638 12.............................. 798512 T43059 ------------------------------------------------------------------------ (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 except where the maintenance performed is being done in lieu of performing the maintenance on wing. (c) The accomplishment of the inspections and repairs specified in this AD must be performed at GE Engine Services--Dallas, LP., certificate number RA1R445K of Dallas, Texas. Operators wishing to use another facility to perform the required inspections and repairs must apply for an alternative method of compliance in accordance with paragraph (e) of this AD. (d) Report the following information on a monthly basis to the Manager of the Engine Certification Office, FAA, 12 New England Executive Park, Burlington, MA 01803-5299; fax (781) 238-7199, Internet: Mark.C.F[email protected]. Reporting requirements have been approved by the Office of Management and Budget and assigned OMB control number 2120-0056: (1) S/N of engines inspected in accordance with paragraph (a) of this AD. [[Page 27011]] (2) S/N of engines found with arc burns and approximate size of the arc burn. (3) S/N of engines repaired in accordance with paragraph (a) of this AD. (4) Hours and CIS since last shop visit and total hours and CIS of disks inspected in accordance with paragraph (a) of this AD. (5) Report to the Manager of the Engine Certification Office, within two business days of finding one of the following conditions as a result of inspecting a disk in accordance with paragraph (a) of this AD: (i) A crack depth of more than 5 mils. (ii) More than 2 tie rod holes with cracks. (iii) Arc burn depth beyond 9 mils. (e) 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. (f) 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 May 7, 1998. Thomas A. Boudreau, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 98-12918 Filed 5-14-98; 8:45 am] BILLING CODE 4910-13-U