99-12-03: Critical Life Limited Part Inspection

99-12-03 Pratt & Whitney: Amendment 39-11187, Docket 98-ANE-48-AD. Applicability: Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR series turbofan engines, installed on but not limited to Boeing 727 and 737 series and McDonnell Douglas DC-9 series 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. 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 30 days after the effective date of this AD, revise the Time Limits Section (TLS) of the Pratt & Whitney (PW) JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR Turbofan Engines Engine Manual (EM), part number 481672, and for air carrier operations revise the approved continuous airworthiness maintenance program, by adding the following: "5. Critical Life Limited Part Inspection A. Inspection Requirements: (1) This section has the definitions for individual engine piece parts and the inspection procedures which are necessary when these parts are removed from the engine. (2) It is necessary to do theinspection procedures of the piece parts in paragraph B when: (a) The part is removed from the engine and disassembled to the level specified in paragraph B and (b) The part has accumulated more than 100 cycles since the last piece part inspection, provided that the part was not damaged or related to the cause for its removal from the engine. (3) The inspections specified in this paragraph do not replace or make not necessary other recommended inspections for these parts or other parts. B. Parts Requiring Inspection Note: Piece part is defined as any of the listed parts with all the blades removed. ENGINE MANUAL DESCRIPTION Hub (Disk), 1st Stage Compressor SECTION INSPECTION 491201 72-33-31 -04,-02,-03 496501 72-33-31 -04,-02,-03 504101 72-33-31 -04,-02,-03 515201 72-33-31 -04,-02,-03 594301 72-33-31 -04,-02,-03 640501 72-33-31 -04,-02,-03 640601 72-33-31 -04,-02,-03 743301 72-33-31 -04,-02,-03 749701 72-33-31-04,-02,-03 749801 72-33-31 -04,-02,-03 750001 72-33-31 -04,-02,-03 750101 72-33-31 -04,-02,-03 778901 72-33-31 -04,-02,-03 791401 72-33-31 -04,-02,-03 791501 72-33-31 -04,-02,-03 791601 72-33-31 -04,-02,-03 791701 72-33-31 -04,-02,-03 791801 72-33-31 -04,-02,-03 806001 72-33-31 -04,-02,-03 806101 72-33-31 -04,-02,-03 817401 72-33-31 -04,-02,-03 844401 72-33-31 -04,-02,-03 845401 72-33-31 -04,-02,-03 848001 72-33-31 -04,-02,-03 848101 72-33-31 -04,-02,-03 Disk, 2nd Stage Compressor 482502 72-33-33 -02 502502 72-33-33 -02 520602 72-33-33 -02 570302 72-33-33 -02 570402 72-33-33 -02 678202 72-33-33 -02 730202 72-33-33 -02 730302 2-33-33 -02 730402 72-33-33 -02 740502 72-33-33 -02 745702 72-33-33 -02 745902 72-33-33 -02 746002 72-33-33 -02 746802 72-33-33 -02 760402 72-33-33 -02 760502 72-33-33 -02 807502 72-33-33 -02 5002402-01 72-33-33 -02 790832 (Disk assembly) 72-33-33 -02" (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 Time Limits section in the EM. (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. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector (PMI), who may add comments and then send it to the 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. (d) Special flight permits may be issued in accordance with Sec. 21.197 andSec. 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 Sec. 121.369 (c) of the Federal Aviation Regulations [14 CFR 121.369 (c)] of this chapter 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 Sec. 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 Sec. 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 July 8, 1999.