Airworthiness directives: Pratt & Whitney,
[Federal Register: December 31, 1998 (Volume 63, Number 251)]
[Rules and Regulations]
[Page 72148-72154]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr31de98-14]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 98-ANE-77-AD; Amendment 39-10975; AD 99-01-08]
RIN 2120-AA64
Airworthiness Directives; Pratt & Whitney JT8D and JT3D Series Turbofan Engines
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule; request for comments.
SUMMARY: This amendment adopts a new airworthiness directive (AD) that is applicable to Pratt & Whitney (PW) JT8D and JT3D series turbofan engines. This action requires operators to remove and replace with serviceable parts, certain stage 7 through stage 15 high-pressure compressor (HPC) disks identified by part number and serial number. This amendment is prompted by a report of an uncontained failure of a stage 8 HPC disk during a takeoff roll that resulted in damage to the airplane. The actions specified in this AD are intended to prevent the failure of a high-pressure compressor disk due to Cadmium embrittlement, resulting in uncontained engine failure and damage to the airplane.
DATES: Effective January 5, 1999.
Comments for inclusion in the Rules Docket must be received on or before March 1, 1999.
ADDRESSES: Submit comments in triplicate to the Federal Aviation Administration (FAA), New England Region, Office of the Regional Counsel, Attention: Rules Docket No. 98-ANE-77-AD, 12 New England Executive Park, Burlington, MA 01803-5299. Comments may also be sent via the Internet using the following address: ``9-ad- engineprop@faa.gov''. Comments sent via the Internet must contain the docket number in the subject line.
The service information referenced in this AD may be obtained from Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone (860) 565-6600, fax (860) 565-4503. This information may be examined at the FAA, New England Region, Office of the Regional Counsel, 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: The Federal Aviation Administration (FAA) has received a report of an uncontained failure of a stage 8 high- pressure compressor (HPC) disk, part number (P/N) 787008, installed on a Pratt & Whitney (PW) JT8D-9 turbofan engine. The laboratory testing revealed that the disk failed as a result of Cadmium embrittlement. Nickel-Cadmium (NiCd) coatings are used on JT8D and JT3D steel disks to inhibit corrosion. The coating process consists of many steps, the most fundamental of which are the electrolytic deposition of a Nickel base layer followed eventually by the electrolytic deposition of a Cadmium layer. The part is then baked in an oven. During the bake cycle the Nickel layer diffuses into the Cadmium which creates an alloy with a higher melting temperature than pure Cadmium and immobilizes the Cadmium to prevent the liquid metal embrittlement of the steel part. The Cadmium rich outer layer acts as the corrosion inhibitor. The diffused Nickel acts to immobilize the Cadmium and prevent Cadmium embrittlement of the steel. If the Nickel plating is not applied with sufficient thickness during the NiCd plating process, the undiffused Cadmium can attack the grain boundaries of the base metal. Failure results when the disk is exposed to engine operating temperatures and stresses. Analysis of this and other Cadmium embrittlement failures indicates that a disk exposed to Cadmium embrittlement will likely fail within 500 hours time-in-service (TIS). Based on the risks associated with a process anomaly at the repair facility that plated the disk, the FAA has determined that action is required to remove a number of disks plated at that facility since February 1996. The disks most at risk are those disks which have accumulated less than 500 hours TIS since they were last plated. Disks which have accumulated more than 500 hours TIS since plating will not be recalled by this AD. The FAA has identified stage 7 through stage 15 HPC disks by P/N and serial number (S/N) that have been NiCd plated by the repair facility from February 1996 through October 1998. This condition, if not corrected, could result in the failure of a high-pressure compressor disk due to Cadmium embrittlement, resulting in uncontained engine failure and damage to the airplane.
Since an unsafe condition has been identified that is likely to exist or develop on other engines of the same type design, this AD is being issued to prevent the failure of a high-pressure compressor disk due to Cadmium embrittlement, resulting in uncontained engine failure and damage to the airplane. This AD requires removal and replacement of certain part-numbered and serial-numbered stage 7 through stage 15 HPC disks with serviceable parts.
Since a situation exists that requires the immediate adoption of this regulation, it is found that notice and opportunity for prior public comment hereon are impracticable, and that good cause exists for making this amendment effective in less than 30 days.
[[Page 72149]]
Comments Invited
Although this action is in the form of a final rule that involves requirements affecting flight safety and, thus, was not preceded by notice and an opportunity for public comment, comments are invited on this rule. Interested persons are invited to comment on this 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 under the caption ADDRESSES. All communications received on or before the closing date for comments will be considered, and this rule may be amended in light of the comments received. Factual information that supports the commenter's ideas and suggestions is extremely helpful in evaluating the effectiveness of the AD action and determining whether additional rulemaking action would be needed.
Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the rule that might suggest a need to modify the 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 that summarizes each FAA-public contact concerned with the substance of this AD will be filedin 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 98-ANE-77-AD.'' The postcard will be date stamped and returned to the commenter.
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.
The FAA has determined that this regulation is an emergency regulation that must be issued immediately to correct an unsafe condition in aircraft, and is not a ``significant regulatory action'' under Executive Order 12866. It has been determined further that this action involves an emergency regulation under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979). If it is determined that this emergency regulation otherwise would be significant under DOT Regulatory Policies and Procedures, a final regulatory evaluation will be prepared and placed in the Rules Docket. A copy of it, if filed, 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
-
The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
-
Section 39.13 is amended by adding the following new airworthiness directive:
99-01-08 Pratt & Whitney: Amendment 39-10975. Docket 98-ANE-77-AD.
Applicability: Pratt & Whitney (PW) JT8D and JT3D series turbofan engines, with stage 7 through stage 15 high-pressure compressor (HPC) disks installed, identified by part number (P/N) and serial number (S/N) specified in Appendix 1. These engines are installed on but not limited to the following aircraft: Boeing 707, 727, and 737 series airplanes and McDonnell Douglas DC-8, DC-9, and MD-80 series airplanes.
Appendix 1
Disk Part Number and Serial Number (Sorted by Disk Part Number)
Stage
Disk part No. Disk serial No.
-
701407 7A7271 7................................
701507 4Z2030 7................................
701507 4Z2122 7................................
701507 8Z6454 7................................
766007 8B5265 7................................
774407 B207AA0307 7................................
774407 B207AA0350 7................................
774407 B207AA0379 7................................
774407 B207AA0578 7................................
774407 B207AA0643 7................................
774407 BENCAH1353 7................................
774407 BENCAH2320 7................................
774407 BENCAH2327 7................................
774407 BENCAH2851 7................................
774407 BENCAH4091 7................................
774407 BENCAJ8414 7................................
774407 BENCAJ8440 7................................
774407 BENCAK1631 7................................
774407 BENCAK1684 7................................
774407 BENCAK5135 7................................
774407 BENCAK6623 7................................
774407 BENCAK6643 7................................
774407 BENCAK8115 7................................
774407 H19093 7................................
774407 H19026 7................................
774407 H29904 7................................
774407 J17128 7................................
774407 J17407 7................................
774407 J39120 7................................
774407 J72011 7................................
774407 J72132 7................................
774407 K20050 7................................
774407 K20167 7................................
774407 K78491 7................................
774407 L72139 7................................
774407 M15364 7................................
774407 M15368 7................................
774407 M77985 7................................
774407 M83784 7................................
774407 M93463 7................................
774407 N14127 7................................
774407 N14190 7................................
774407 N14213 7................................
774407 N24114 7................................
774407 N23978 7................................
774407 N24091 7................................
774407 N37879 7................................
774407 N37919 7................................
774407 N70390 7................................
774407 N88161 7................................
774407 N88195 7................................
774407 N88335 7................................
774407 N88342 7................................
774407 N94974 7................................
774407 N95036 7................................
774407 P14716 7................................
774407 P14741 7................................
774407 P35486 7................................
774407 P54563 7................................
774407 P60347 7................................
774407 P60394 7................................
774407 P60446 7................................
774407 P70328 7................................
774407 P81247 7................................
774407 P81253 7................................
774407 P81392 7................................
774407 P81399 7................................
774407 P86295 7................................
774407 P86311 7................................
774407 R03089 7................................
774407 R12413 7................................
774407 R12418 7................................
774407 R12549 7................................
774407 R12557 7................................
774407 R19365 7................................
774407 R31290 7................................
774407 R31411 7................................
774407 R37414 7................................
774407 R37520 7................................
774407 R37554 7................................
774407 R46834 7................................
774407 R46893 7................................
774407 R46918 7................................
774407 R46943 7................................
774407 R47019 7................................
774407 R72171
[[Page 72150]]
-
774407 R72257 7................................
774407 S05566 7................................
774407 S05610 7................................
774407 S05659 7................................
774407 S10014 7................................
774407 S10050 7................................
774407 S13885 7................................
774407 S13910 7................................
774407 S14048 7................................
774407 S14063 7................................
774407 S14088 7................................
774407 S14173 7................................
774407 S36633 7................................
774407 S36810 7................................
774407 S36857 7................................
774407 S37128 7................................
774407 S37149 7................................
774407 S37168 7................................
774407 S37187 7................................
774407 S37312 7................................
774407 S37367 7................................
774407 S37389 7................................
774407 S37420 7................................
774407 S37469 7................................
774407 S37498 7................................
774407 T04409 7................................
774407 T04526 7................................
774407 T04566 7................................
774407 T04615 7................................
774407 T04632 7................................
774407 T04898 7................................
774407 T04899 7................................
774407 T04988 7................................
774407 T05055 7................................
774407 T05106 7................................ 5006007-01 B207AA0068 7................................ 5006007-01 B207AA0693 7................................ 5006007-01 BENCAH0061 7................................ 5006007-01 BENCAH3134 7................................ 5006007-01 BENCAJ8558 7................................ 5006007-01 BENCAJ8594 7................................ 5006007-01 BENCAL0749 7................................ 5006007-01 BENCAL2650 7................................ 5006007-01 R54586 7................................ 5006007-01 R79450 7................................ 5006007-01 S11202 7................................ 5006007-01 S11206 7................................ 5006007-01 S57118 7................................ 5006007-01 S57216 7................................ 5006007-01 S57519 7................................ 5006007-02 BENCAK9643 7................................ 5006007-02 BENCAK9690 7................................ 5006007-02 BENCAK9697 7................................ 5006007-02 BENCAK9705 7................................ 5006007-02 BENCAK9723 7................................ 5006007-02 BENCAL3657 7................................ 5006007-02 BENCAL5478 7................................
774407 BENCAH0521 7................................
774407 BENCAJ8454 7................................
774407 R57626 7................................
774407 T04885 8................................
738308 9B1363 8................................
738308 H03990 8................................
748608 7A9608 8................................
748608 7B9489 8................................
748608 8B0397 8................................
748608 B208AA0030 8................................
748608 B208AA0045 8................................
748608 B208AA0070 8................................
748608 BENCAJ8185 8................................
748608 G30014 8................................
748608 G62624 8................................
748608 G63907 8................................
748608 H29599 8................................
748608 H35085 8................................
748608 H64390 8................................
748608 H84992 8................................
748608 H86520 8................................
748608 J29857 8................................
748608 J29958 8................................
748608 J57418 8................................
748608 J57426 8................................
748608 J57469 8................................
748608 J57532 8................................
748608 J57660 8................................
748608 J57663 8................................
748608 J94763 8................................
748608 J94815 8................................
748608 M54646 8................................
748608 M54770 8................................
748608 M54821 8................................
748608 M54843 8................................
748608 N14562 8................................
748608 N14765 8................................
748608 N84308 8................................
748608 N84314 8................................
748608 N84317 8................................
748608 N84319 8................................
748608 N84373 8................................
748608 N84418 8................................
748608 P26025 8................................
748608 P26136 8................................
748608 P26153 8................................
748608 P26171 8................................
748608 P28471 8................................
748608 P28530 8................................
748608 P28534 8................................
748608 P28564 8................................
748608 P28596 8................................
748608 P28607 8................................
748608 P83853 8................................
748608 P94736 8................................
748608 P98927 8................................
748608 R18995 8................................
748608 R46153 8................................
748608 R73850 8................................
748608 S01136 8................................
748608 S01153 8................................
748608 S01185 8................................
748608 S50692 8................................
748608 S50748 8................................
748608 S78016 8................................
748608 S78066 8................................
748608 S78128 8................................
787008 K51696 8................................
787008 K52389 8................................
787008 L61543 8................................
787008 M76852 8................................
787008 M77423 8................................
787008 M77749 8................................
787008 M77791 8................................
787008 N33354 8................................
787008 N33408 8................................
787008 N33702 8................................
787008 N33760 8................................
787008 N89060 8................................
787008 N89386 8................................
787008 N90133 8................................
787008 N90152 8................................
787008F N89050 8................................
787208 B228AA0194 8................................
787208 B228AA0343 8................................
787208 B228AA0371 8................................
787208 B228AA0540 8................................
787208 B228AA0574 8................................
787208 B228AA0605 8................................
787208 BENCAH4505 8................................
787208 BENCAH5428 8................................
787208 BENCAH5435 8................................
787208 BENCAJ5724 8................................
787208 BENCAK0065 8................................
787208 BENCAK0066 8................................
787208 BENCAK6165 8................................
787208 BENCAK6359 8................................
787208 BENCAK8796 8................................
787208 BENCAK9253 8................................
787208 BENCAL1567 8................................
787208 BENCAL1571 8................................
787208 BENCAL1579 8................................
787208 BENCAL1887 8................................
787208 BENCAL3339 8................................
787208 BENCAL5283 8................................
787208 BENCAM0672 8................................
787208 J47026 8................................
787208 K12730 8................................
787208 N06609 8................................
787208 N89709 8................................
787208 P43644 8................................
787208 P43665 8................................
787208 P43897 8................................
787208 P43936 8................................
787208 P43950 8................................
787208 P43954 8................................
787208 P44141 8................................
787208 P44694 8................................
787208 P45378 8................................
787208 P45593 8................................
787208 R23192 8................................
787208 R23234 8................................
787208 R23450 8................................
787208 R23452 8................................
787208 R23569 8................................
787208 R23837 8................................
787208 R24172 8................................
787208 R24201 8................................
787208 R24205 8................................
787208 R24390 8................................
787208 R24599 8................................
787208 R24827 8................................
787208 R91709 8................................
787208 S07732 8................................
787208 S39110 8................................
787208 S39281 8................................
787208 S39337 8................................
787208 S39409 8................................
787208 S39410 8................................
787208 S39487 8................................
787208 S39509 8................................
787208 S39534 8................................
787208 S39633 8................................
787208 S39676 8................................
787208 S39721 8................................
787208 S39942 8................................
787208 S39963 8................................
787208 S39996 8................................
787208 S40033 8................................
787208 S40041
[[Page 72151]]
-
788608 H36177 8................................
788708 7A2254 8................................
789508 G51990 8................................
789608 J46995 8................................
792038 B228AA0331 8................................
792038 B228AA0511 8................................
792038 B228AA1005 8................................
792038 BENCAJ8854 8................................
792038 BENCAJ8871 8................................
796348 K53240 8................................
797938 BENCAL2605 8................................ 5005808-01 B228AA0901 8................................ 5005808-01 BENCAJ1138 8................................ 5005808-01 BENCAJ8902 8................................ 5005808-01 S70327 9................................
628209 5X8746 9................................
701509 8Z5256 9................................
701509 9A6145 9................................
701509 H86825 9................................
701509 J00245 9................................
701509 J25666 9................................
701509 J87515 9................................
701509 J89031 9................................
701509 K34309 9................................
701509 K35061 9................................
701509 K55559 9................................
701509 K85824 9................................
701509 L31209 9................................
701509 L31751 9................................
701509 L55770 9................................
701509 M10469 9................................
701509 M40027 9................................
701509 M49712 9................................
701509 M61566 9................................
701509 M84762 9................................
701509 M86342 9................................
701509 M86842 9................................
701509 M86844 9................................
701509 N02758 9................................
701509 N02994 9................................
701509 N209AA0006 9................................
701509 N209AA0080 9................................
701509 N209AA0091 9................................
701509 N209AA0094 9................................
701509 N209AA0255 9................................
701509 N209AA0339 9................................
701509 N209AA0352 9................................
701509 N209AA0561 9................................
701509 N21068 9................................
701509 N21507 9................................
701509 N21508 9................................
701509 N22475 9................................
701509 N22570 9................................
701509 N22591 9................................
701509 N41297 9................................
701509 N42662 9................................
701509 N57120 9................................
701509 N79874 9................................
701509 N79893 9................................
701509 N81317 9................................
701509 N97653 9................................
701509 NENCAH0017 9................................
701509 NENCAH0187 9................................
701509 NENCAH0192 9................................
701509 NENCAH0222 9................................
701509 NENCAH0269 9................................
701509 NENCAH0280 9................................
701509 NENCAH0337 9................................
701509 NENCAH0422 9................................
701509 NENCAH0445 9................................
701509 NENCAH0451 9................................
701509 NENCAH0593 9................................
701509 NENCAH0737 9................................
701509 NENCAH0757 9................................
701509 NENCAH0913 9................................
701509 NENCAH0920 9................................
701509 NENCAH1014 9................................
701509 NENCAH1227 9................................
701509 NENCAH1357 9................................
701509 NENCAH1430 9................................
701509 P11360 9................................
701509 P11370 9................................
701509 P11443 9................................
701509 P11450 9................................
701509 P12878 9................................
701509 P51572 9................................
701509 P52444 9................................
701509 P52971 9................................
701509 P53248 9................................
701509 P77028 9................................
701509 P77207 9................................
701509 P78457 9................................
701509 P97645 9................................
701509 P98143 9................................
701509 P98661 9................................
701509 P98961 9................................
701509 P98991 9................................
701509 R17442 9................................
701509 R18113 9................................
701509 R45676 9................................
701509 R46466 9................................
701509 R72941 9................................
701509 R73009 9................................
701509 R73013 9................................
701509 R73420 9................................
701509 R73464 9................................
701509 R73467 9................................
701509 R73804 9................................
701509 R73934 9................................
701509 S00689 9................................
701509 S00741 9................................
701509 S00777 9................................
701509 S00798 9................................
701509 S18975 9................................
701509 S19201 9................................
701509 S50490 9................................
701509 S77602 9................................
701509 S77616 9................................
701509 S77651 9................................
739509 G79836 9................................
772509 H49185 9................................
772509 K56788 9................................
772509 P97497 9................................
772509 R73983 9................................
772509 S01209 9................................
772509 S50832 9................................
798509 B209AA0539 9................................
798509 BENCAH3770 9................................
798509 BENCAJ9383 9................................
798509 BENCAK9880 9................................
798509 BENCAL0717 9................................
798509 BENCAL0703 9................................
798509 BENCAL2372 9................................
798509 BENCAL6305 9................................
701509 BENCAH0448 9................................
701509N R18236 9................................
772509 K23767 9................................
798509 BENCAJ9360 9................................
798509 P53159 10...............................
701410 7Z0800 10...............................
701410 7Z0806 10...............................
701810 0A0377 10...............................
701810 3B8966 10...............................
701810 3B9144 10...............................
701810 9Z9847 10...............................
701810 A00862 10...............................
701810 H39339 10...............................
701810 H60642 10...............................
701810 R22292 10...............................
701810G G82663 10...............................
770510 4B4921 10...............................
770510 G80187 10...............................
772510 B210AA0014 10...............................
772510 B210AA0202 10...............................
772510 B210AA0273 10...............................
772510 B210AA0637 10...............................
772510 B210AA0640 10...............................
772510 B210AA0749 10...............................
772510 B210AA0752 10...............................
772510 B210AA0429 10...............................
772510 BENCAH0251 10...............................
772510 BENCAH1404 10...............................
772510 BENCAJ9735 10...............................
772510 BENCAJ9784 10...............................
772510 BENCAJ9868 10...............................
772510 BENCAK5318 10...............................
772510 BENCAK5762 10...............................
772510 BENCAK5946 10...............................
772510 BENCAK9105 10...............................
772510 BENCAL0388 10...............................
772510 BENCAL1598 10...............................
772510 BENCAL1601 10...............................
772510 BENCAL2427 10...............................
772510 BENCAL4455 10...............................
772510 BENCAL5993 10...............................
772510 H34395 10...............................
772510 H58784 10...............................
772510 J23708 10...............................
772510 J68609 10...............................
772510 J87953 10...............................
772510 J88767 10...............................
772510 K03190 10...............................
772510 K03586 10...............................
772510 K24796 10...............................
772510 K25271 10...............................
772510 K35625 10...............................
772510 K55848 10...............................
772510 K66100 10...............................
772510 K68068 10...............................
772510 K85468 10...............................
772510 L15000 10...............................
772510 L56873 10...............................
772510 L84428 10...............................
772510 L86007 10...............................
772510 M10049 10...............................
772510 M10613 10...............................
772510 M39974 10...............................
772510 M56263 10...............................
772510 M61659 10...............................
772510 M84606 10...............................
772510 M87097 10...............................
772510 N03907 10...............................
772510 N02538 10...............................
772510 N02778 10...............................
772510 N03133 10...............................
772510 N21767 10...............................
772510 N22275
[[Page 72152]]
-
772510 N41185 10...............................
772510 N41208 10...............................
772510 N41484 10...............................
772510 N41613 10...............................
772510 N42094 10...............................
772510 N42143 10...............................
772510 N42187 10...............................
772510 N42838 10...............................
772510 N57150 10...............................
772510 N57830 10...............................
772510 N57862 10...............................
772510 N80227 10...............................
772510 N80661 10...............................
772510 N80671 10...............................
772510 N81136 10...............................
772510 N81150 10...............................
772510 N81454 10...............................
772510 N81456 10...............................
772510 P11024 10...............................
772510 P11818 10...............................
772510 P11869 10...............................
772510 P12016 10...............................
772510 P12811 10...............................
772510 P51804 10...............................
772510 P51873 10...............................
772510 P52670 10...............................
772510 P53019 10...............................
772510 P53213 10...............................
772510 P76639 10...............................
772510 P77620 10...............................
772510 P77862 10...............................
772510 P78050 10...............................
772510 P97278 10...............................
772510 P98630 10...............................
772510 R17507 10...............................
772510 R18502 10...............................
772510 R18520 10...............................
772510 R44856 10...............................
772510 R44861 10...............................
772510 R44864 10...............................
772510 R45159 10...............................
772510 R46345 10...............................
772510 R72614 10...............................
772510 R72630 10...............................
772510 R72884 10...............................
772510 R73138 10...............................
772510 R73408 10...............................
772510 R73612 10...............................
772510 R73617 10...............................
772510 R73862 10...............................
772510 S01349 10...............................
772510 S01364 10...............................
772510 S01365 10...............................
772510 S01406 10...............................
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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 (b) 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.
[[Page 72154]]
To prevent the failure of a high-pressure compressor disk due to Cadmium embrittlement, resulting in uncontained engine failure and damage to the airplane, accomplish the following:
(a) Remove from service stage 7 through stage 15 high-pressure compressor (HPC) disks identified in Appendix 1 of this AD as follows:
(1) For disks with less than 250 hours time in service (TIS) since last NiCd plating, remove disk and replace with a serviceable part within 100 hours TIS after the effective date of this AD.
(2) For disks with greater than or equal to 250 hours and less than 500 hours TIS since last NiCd plating, remove disk and replace with a serviceable part within 150 hours TIS after the effective date of this AD.
(3) For disks with greater than or equal to 500 hours TIS since last NiCd plating no action is required.
(4) Disks removed from service in accordance with this AD are not eligible for installation in any engine.
(b) 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 requests 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.
(c) 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 record search requirements of this AD can be accomplished.
(d) This amendment becomes effective on January 5, 1999.
Issued in Burlington, Massachusetts, on December 23, 1998. David A. Downey, Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service.
[FR Doc. 98-34706Filed12-30-98; 8:45 am]
BILLING CODE 4910-13-P
