90-23-19 PRATT & WHITNEY: Amendment 39-6753. Docket No. 90-ANE-11.
Applicability: Pratt & Whitney (PW) JT9D-3A/-7/-7A/-7A(SP)/-7AH/-7F/-7H/-7J/-20/-20J/-7R4D/-7R4D1/ -7R4E/-7R4E1/-7R4E4/-7R4H1/-7R4G2 turbofan engines installed on, but not limited to, Boeing 767, Boeing 747, McDonnell Douglas DC10-40, Airbus A300 and Airbus A310 aircraft.
Compliance: Required as indicated, unless already accomplished.
To prevent failure of the high pressure turbine HPT) stage one rotating air seal, which could result in an uncontained engine failure, accomplish the following:
(a) For JT9D-7R4E1 (AI 600 Series)/E4/H1 model engines, remove from service HPT stage one rotating air seal, Part Numbers (P/N) 797576, 797576P48, 793707 and 793707P48, within 60 days from the effective date of this AD, in accordance with Service Bulletin (SB) JT9D-7R4-72-392, Revision 2, dated March 2, 1990.
(b) For JT9D-7R4G2 model engines, remove from service HPT stage one rotating air seal, P/N's 797576, 797576P48, 793707 and 793707P48, at the next engine shop visit or within 2,350 cycles in service (CIS) from the effective date of this AD, whichever occurs first, in accordance with SB JT9D-7R4-72-392, Revision 2, dated March 2, 1990.
(c) For JT9D-7R4D/D1/E/E1(AI 500 Series) model engines, remove from service HPT stage one rotating air seal, P/N's 797576, 797576P48 and 793707, whose part serial numbers (S/N) are listed in Tables 1-3 inclusive of JT9D SB JT9D-7R4-72-393, Revision 1, dated December 21, 1989, at the next engine shop visit or within 2,450 CIS from the effective date of this AD, whichever occurs first, in accordance with the above noted SB.
(d) For JT9D-7R4D/D1/E/E1(AI 500 series) model engines, fluorescent penetrant inspect (FPI) HPT stage one rotating air seal, P/N's 797576, 797576P48 and 793707, whose part S/N's are not listed in Tables 1-3 inclusive of SB JT9D-7R4-72-393, Revision 1, dated December 21, 1989, in accordance with the Accomplishment Instructions, Part B, of the above noted SB, at the next HPT module exposure or within 2,900 CIS after the effective date of this AD, whichever occurs first. Remove from service parts found cracked and replace with a serviceable air seal. Thereafter, reinspect at each HPT module exposure not to exceed 2,900 cycles since last inspection (CSLI), in accordance with the above noted SB.
(e) For JT9D-3A/-7/-7A/-7A(SP)/-7AH/-7F/-7H/-7J/-20/-20J model engines, remove from service HPT stage one rotating air seals, P/N's 797576, 797576P48 and 793707, whose part S/N's are listed in Tables 1-3 inclusive of SB 5873, Revision 1, dated December 21, 1989, at the next engine shop visit or within 2,450 CIS after the effective date of this AD, whichever occurs first.
(f) For JT9D-3A/-7/-7A/-7A(SP)/-7AH/-7F/-7H/-7J/-20/-20J model engines, FPI HPT stage one rotating air seal, P/N's 797576, 797576P48 and 793707, whose part S/N's are not listed in Tables 1-3 inclusive of PW SB 5873, Revision 1, dated December 21, 1989,in accordance with the Accomplishment Instructions, Part B, of the above noted SB, at the next HPT module exposure or within 2,900 CIS from the effective date of this AD, whichever occurs first. Remove from service parts found cracked and replace with a serviceable air seal. Thereafter, reinspect at each HPT module exposure not to exceed 2,900 CSLI, in accordance with the above noted SB.
(g) For the purpose of this AD, an engine shop visit is defined as the induction of an engine into a shop for the conduct of engine maintenance.
(h) For the purpose of this AD, HPT module exposure is defined as separation of the M Flange.
(i) Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished.
(j) Upon submission of substantiating data by an owner or operator through an FAA Airworthiness Inspector, an alternate method of compliance with the requirements of this AD or adjustments to the compliance schedule specifiedin this AD may be approved by the Manager, Engine Certification Office, Engine and Propeller Directorate, Aircraft Certification Service, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803.
The removal and inspection procedures shall be done in accordance with the following PW documents:
Document
Page No.
Revision
Date
SB JT9D-7R4-72-392
2
Original
Oct. 25, 1989
5, 6, 8,
Rev.1
Dec. 21, 1989
9, 10
1, 3, 4, 7
Rev.2
March 2, 1990
SB JT9D-7R4-72-393
2-4
Original
Oct. 27, 1989
1, 5 thru 15
Rev. 1
Dec. 21, 1989
SB 5873
2 thru 5
Original
Oct. 30, 1989
1, 6, thru 16
Rev. 1
Dec. 20, 1989
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, Publications Department, P.O. Box 611, Middletown, Connecticut 06457. Copies may be inspected at the Regional Rules Docket, Office of the Assistant Chief Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Room 311, Burlington, Massachusetts 01803, or at the Office of the Federal Register, 1100 L Street NW, Room 8301, Washington, D.C. 20591.
This amendment (39-6753, AD 90-23-19) becomes effective on November 23, 1990.