2000-01-13: Airworthiness Directives; Pratt & Whitney JT9D Series Turbofan Engines

2000-01-13 Pratt & Whitney: Amendment 39-11511 Docket No. 98-ANE-47-AD. Supersedes AD 99-08-12, Amendment 39-11118. Applicability: Pratt & Whitney (PW) JT9D-7, -7A, -7H, -7AH, -7F, -7J, -20, -20J, -59A, -70A, -7Q, -7Q3, -7R4D, -7R4D1, -7R4E, -7R4E1, -7R4E4, -7R4G2, and -7R4H1 series turbofan engines, installed on but not limited to Boeing 747 and 767 series, McDonnell Douglas DC-10 series, and Airbus Industrie A300 and A310 airplanes. 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 (c) 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. For all the fan hubs and HPT disks listed in the following tables, the focused inspections shall be conducted per the applicable documents. To prevent critical life-limited rotating engine part failure, which could result in an uncontained engine failure and damage to the airplane, accomplish the following: (a) Within the next 35 days after the effective date of this AD, revise the Engine Time Limits Section (TLS) of the Engine Manual (EM), JT9D Part Numbers 646028, 754459, 770407, 770408, 777210, 785058, 785059, 789328, as indicated below, and for air carrier operations revise as appropriate the approved continuous airworthiness maintenance program, by adding the following: " MANDATORY INSPECTIONS (1)Perform inspections of the following parts at each piece-part opportunity in accordance with the instructions provided in the applicable manual provisions: Engine Model Part Nomenclature Engine Manual Part Number FPI per Manual Section Inspection 7/7A/7AH/7F 7H/7J/20/20J All Fan Hubs 646028 (or the equivalent customized versions, 770407 and 770408) 72-31-04 02 7/7A/7AH/7F 7H/7J/20/20J All HPT 1st Disks 646028 (or the equivalent customized versions, 770407 and 770408) 72-51-02 01 7/7A/7AH/7F 7H/7J/20/20J All HPT 2nd Disks 646028 (or the equivalent customized versions, 770407 and 770408) 72-51-02 03 59A/70A All Fan Hubs 754459 72-31-00 Heavy Maintenance Check 59A/70A All HPT 1st Disks 754459 72-51-02 Heavy Maintenance Check 59A/70A All HPT 2nd Disks 754459 72-51-02 Heavy Maintenance Check 7Q/7Q3 All Fan Hubs 777210 72-31-00 03 7Q/7Q3 All HPT 1st Disks 777210 72-51-06 01 7Q/7Q3 All HPT 2nd Disks 777210 72-51-07 01 7R4 All Fan Hubs 785058, 785059 and 789328 72-31-00 03 7R4 All HPT 1st Disks 785058, 785059 and 789328 72-51-06 01 7R4 All HPT 2nd Disks 785058, 785059 and 789328 72-51-07 01 (2) For the purposes of these mandatory inspections, piece-part opportunity means: (i) The part is considered completely disassembled when done in accordance with the disassembly instructions in the manufacturer's engine manual; and (ii) The part has accumulated more than 100 cycles in service since the last piece-part opportunity inspection, provided that the part was not damaged or related to the cause for its removal from the engine." (b) Except as provided in paragraph (c) of this AD, and notwithstanding contrary provisions in section 43.16 of the Federal Aviation Regulations (14 CFR 43.16), these mandatory inspections shall be performed only in accordance with the ALS of the manufacturer's ICA. (c) 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 Engine Certification Office (ECO). Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector (PMI), who may add comments and then send it to the ECO. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the ECO. (d) 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 airplane to a location where the requirements of this AD can be accomplished. (e) FAA-certificated air carriers that have an approved continuous airworthiness maintenance program in accordance with the record keeping requirement of 121.369 (c) of the Federal Aviation Regulations [14 CFR 121.369 (c)] must maintain records of the mandatory inspections that result from revising the Time Limits Section of the Instructions for Continuous Airworthiness (ICA) and the air carrier's continuous airworthiness program. Alternately, certificated air carriers may establish an approved system of record retention that provides a method for preservation and retrieval of the maintenance records that include the inspections resulting from this AD, and include the policy and procedures for implementing this alternate method in the air carrier's maintenance manual required by 121.369 (c) of the Federal Aviation Regulations [14 CFR 121.369 (c)]; however, the alternate system must be accepted by the appropriate PMI and require the maintenance records be maintained either indefinitely or until the work is repeated. Records of the piece-part inspections are not required under 121.380 (a) (2) (vi) of the Federal Aviation Regulations [14 CFR 121.380 (a) (2) (vi)]. All other Operators must maintain the records of mandatory inspections required by the applicable regulations governing their operations. Note 3: The requirements of this AD have been met when the engine manual changes are made and air carriers have modified their continuous airworthiness maintenance plans to reflect the requirements in the Engine Manuals. (f) This amendment becomes effective on February 23, 2000.