86-25-51 PRATT & WHITNEY: Amendment 39-5528. Applies to Pratt & Whitney (PW) JT9D-7R4D, D1, E, E1, E4, and H1 turbofan engines installed on Boeing Company B767, and Airbus Industries A310 and A300 aircraft.
Compliance is required as indicated, unless already accomplished.
To prevent low altitude surges which could result in an inflight shutdown on JT9D-7R4 series engines installed on B767, A310, or A300 aircraft, accomplish the following:
(a) Inspect inlet guide vane (IGV), stage 5, stage 6, and stage 7 compressor variable stator vane synchronizing ring runners within the next 10 calendar days in service from the effective date of this AD in accordance with the applicable PW JT9D-7R4 engine manual, Part Number (P/N) 785058, 785059, or 789328. Determine if the engine is configured with IGV, stage 5, stage 6, and stage 7 runners with a Class 2 average or more.
NOTE: Definition of Class 2 average is an arithmetic average of the IGV, stage 5, stage 6, and stage 7stage runner classes. The IGV through stage 7 runners, P/N's 678495, 678496, 698497, and 623625, respectively, are classified as being Class 1, 2, or 3. The IGV through stage 7 runners P/N's 804046, 804047, 804048, and 804049, respectively, as defined in PW SB 72-316, are non-classified but for the purpose of computing class average are computed as Class 3, even though P/N 804049 stage 7 runner will provide greater clearance than P/N 623625 Class 3 stage 7 runner.
(1) B767, A310, and A300 aircraft with at least one installed JT9D-7R4 series engine configured with IGV through stage 7 runners with a Class 2 average or more may be returned to service, provided the applicable following procedure is adhered to and incorporated into the normal procedure section of the aircraft flight manual (AFM):
(i) Operate B767 aircraft in accordance with Boeing B767 Operations Bulletin Number (OB) 86-13, dated December 9, 1986, or FAA approved equivalent.
(ii) Operate A300 series andA310 series aircraft in accordance with Airbus Operations Engineering Bulletin Numbers (OEB) 50/1 and 86/1 respectively, or FAA approved equivalent.
(2) For B767, A310, and A300 aircraft with both JT9D-7R4 series engines configured with IGV through stage 7 runners with less than a Class 2 average, accomplish the following prior to further flight:
Remove and replace runners with a suitable class to establish a Class 2 average or greater, or accomplish PW service bulletin (SB) 72-316 dated October 22, 1986, or FAA approved equivalent, on at least one installed engine. Aircraft may then be returned to service in accordance with paragraph (a)(1) above.
(b) Modify IGV through stage 7 runners in accordance with PW SB 72-316, dated October 22, 1986, or FAA approved equivalent, prior to December 31, 1987.
NOTE: For an individual operator whose fleet of B767, A310, or A300 aircraft have both engines on all aircraft configured with IGV through stage 7 runners with a Class2 average or greater, or in accordance with paragraph (b) above, the procedure specified in paragraph (a)(1)(i) or (a)(1)(ii) may be discontinued and removed from the aircraft flight manual.
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.
Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, Engine Certification Office, Aircraft Certification Division, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803.
Upon submission of substantiating data by an owner or operator through an FAA maintenance inspector, the Manager, Engine Certification Office, may adjust the compliance times specified in this AD.
PW SB 72-316, dated October 22, 1986; Boeing B767 OB 86-13, dated December 9, 1986; and Airbus OEB 50/1 and 86/1, identified and described in this document are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies, upon request, from Pratt & Whitney, Commercial Division, 400 Main Street, East Hartford, Connecticut 06108; Airbus Industries, Flight Division, Office of Airworthiness, P.O. Box 33, F-31707 Blagnac Cedex, France; and Boeing Commercial Airplane Company, P.O. Box 3707, MS 3k-13, Seattle Washington 98124-2207. These documents also may be examined at the Office of the Regional Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Rules Docket Number 86-ANE-50, Room 311, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday, except Federal holidays.
This amendment becomes effective on March 20, 1987, as to all persons except those persons to whom it was made immediately effective by TAD, issued December 11, 1986, which contained thisamendment.