AD 95-13-06 Airworthiness Directives; Boeing Model 747 Series Airplanes Equipped With General Electric Model CF6-80C2 Series Engines or Pratt & Whitney Model PW4000 Series Engines

Models named: 747 series, CF6-80C2 series, PW4000 series. Read the applicability below — it usually turns on serial or part numbers too.

Model 747 series airplanes having line positions 679 through 1046 inclusive, equipped with General Electric Model CF6-80C2 series engines or Pratt & Whitney Model PW4000 series engines; certificated in any category. Note 1: This Ad applies to each airplane 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 airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (d) of this AD to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition; or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any airplane from the applicability of this AD.

Required as indicated, unless accomplished previously. To prevent failure of the strut and subsequent loss of the engine, accomplish the following: (a) Within 80 months after the effective date of this AD, accomplish the modification of the nacelle strut and wing structure in accordance with Boeing Alert Service Bulletin 747-54A2156, dated December 15, 1994. All of the terminating actions described in the service bulletins listed in paragraph I.C., Table 2, ``Prior or Concurrent Service Bulletins,'' on page 7 of Boeing Alert Service Bulletin 747-54A2156, dated December 15, 1994, must be accomplished in accordance with those service bulletins prior to, or concurrently with, the accomplishment of the modification of the nacelle strut and wing structure required by this paragraph. (b) Perform the inspections and checks (including a torque check to detect loose fasteners) specified in paragraph III, Notes 8, 9, 10, and 11 of the Accomplishment Instructions on page 91 of Boeing Alert Service Bulletin 747-54A2156, dated December 15, 1994, concurrently with the modification of the nacelle strut and wing structure required by paragraph (a) of this AD. Prior to further flight, correct any discrepancies in accordance with the alert service bulletin. (c) Accomplishment of the modification of the nacelle strut and wing structure in accordance with Boeing Alert Service Bulletin 747- 54A2156, dated December 15, 1994, constitutes terminating action for the inspections required by the following AD's: [[Page 33342]] ------------------------------------------------------------------------ Amendment Federal Register AD No. No. citation Date of publication ------------------------------------------------------------------------ 93-17-07. 39-8678 58 FR 45827............. Aug. 31, 1993. 93-03-14. 39-8518 58 FR 14513............. Mar. 18, 1993. 93-24-51. 39-8439 57 FR 60118............. Dec. 18, 1992. ------------------------------------------------------------------------ (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, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Seattle ACO. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO. (e) Special flight permits may be issued in accordance with Secs. 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. (f) The modification, inspections, checks, and correction of discrepancies shall be done in accordance with Boeing Alert Service Bulletin 747-54A2156, dated December 15, 1994. 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 Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124-2207. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (g) This amendment becomes effective on July 28, 1995. Issued in Renton, Washington, on June 16, 1995. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 95-15300 Filed 6-27-95; 8:45 am] BILLING CODE 4910-13-M