Airworthiness directives › 98-19-03
AD 98-19-03 Airworthiness Directives; Pratt & Whitney PW4000 Series Turbofan Engines
Models named: PW4052, PW4056, PW4060, PW4060A, PW4062, PW4152, PW4156A, PW4158, PW4460, PW4462. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Pratt & Whitney Models PW4052, PW4056, PW4060, PW4060A, PW4062, PW4152, PW4156A, PW4158, PW4460, PW4462, PW4164, and PW4168 turbofan engines, with 2nd stage high pressure turbine (HPT) rotating airseals, Part Numbers (P/N) 50L156 or 50L195, installed. These engines are installed on but not limited to Boeing 747 and 767 series, McDonnell Douglas MD-11 series, and Airbus Industrie A300, A310, and A330 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. This 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 eliminated, the request should include specific proposed actions to address it.
Compliance
Required as indicated, unless accomplished previously. To prevent 2nd stage HPT rotating airseal cracking, which could result in an uncontained engine failure and damage to the aircraft, accomplish the following: (a) At the next hot section shop visit after the effective date of this AD, and at each subsequent hot section shop visit, fluorescent penetrant inspect and eddy current inspect 2nd stage HPT rotating airseals for cracks, remove from service cracked airseals, and replace with serviceable parts, in accordance with Pratt & Whitney Alert Service Bulletins (ASBs) No. PW4ENG A72-628, Revision 1, dated February 17, 1998, for models PW4052, PW4056, PW4060, PW4060A, PW4062, PW4152, PW4156A, PW4158, PW4460 and PW4462, and Pratt & Whitney ASB No. PW4G-100-A72-80, Revision 1, dated February 17, 1998, for models PW4164 and PW4168. (b) For the purpose of this AD, a hot section shop visit is defined as any time the HPT modules is disassembled. (c) Within 6 years after the effective date of this AD, modify 2nd stage ring segments and vane clusters, and install improved 2nd stage HPT rotating airseals in accordance with Pratt & Whitney Service Bulletins (SBs) No. PW4ENG 72-636, dated May 16, 1997, and No. PW4ENG 72-637, dated May 16, 1997, for models PW4052, PW4056, PW4060, PW4060A, PW4062, PW4152, PW4156A, PW4158, PW4460 and PW4462, and Pratt & Whitney ASB No. PW4G-100-72-93, dated May 22, 1997, and No. PW4G-100-72-94, dated May 22, 1997 for the PW4164 and PW4168. Performance of these modifications and installation of the improved 2nd stage HPT rotating airseal constitutes terminating action to the inspection requirements 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 requirements of this AD can be accomplished. (f) The actions required by this AD shall be done in accordance with the following Pratt & Whitney service documents: ---------------------------------------------------------------------------------------------------------------- Document No Pages Revision Date ---------------------------------------------------------------------------------------------------------------- ASB No. PW4ENG-A72-628........... 1, 2................ 1.................. February 17, 1998. 3................... Original........... November 21, 1996. 4-9................. 1.................. February 17, 1998. 10.................. Original........... November 21, 1996. 11-22............... 1.................. February 17, 1998. NDIP-894......................... 1-25................ Original........... November 12, 1996. NDIP-896......................... 1-10................ Original........... November 7, 1996. Total Pages: 57. ASB No. PW4G-100-A72-80.......... 1-16................ 1.................. February 17, 1998. NDIP-894......................... 1-25................ Original........... November 12, 1996. NDIP-896......................... 1-10................ Original........... November 7, 1996. Total Pages: 51. SB No. PW4ENG-72-636............. 1-30................ Original........... May 16, 1997. Total Pages: 30. SB No. PW4G-100-72-93............ 1-16................ Original........... May 22, 1997. Total Pages: 16. SB No. PW4ENG-72-637............. 1-15................ Original........... May 16, 1997. Total Pages: 15. SB No. PW4G-100-72-94............ 1-10................ Original........... May 22, 1997. Total Pages: 10. ---------------------------------------------------------------------------------------------------------------- [[Page 48421]] This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Pratt & Whitney, 400 Main St., East Hartford, CT 06108; telephone (860) 565-6600, fax (860) 565- 4503. Copies may be inspected at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street NW., suite 700, Washington, DC. (g) This amendment becomes effective on November 9, 1998. Issued in Burlington, Massachusetts on August 31, 1998. Donald E. Plouffe, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 98-23997 Filed 9-9-98; 8:45 am] BILLING CODE 4910-13-M
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