AD 99-02-05 Airworthiness Directives; Lockheed Model L-1011-385-1 Series Airplanes

Models named: L-1011-385-1, L-1011-385-1-14, L-1011- 385-1-15 series. Read the applicability below — it usually turns on serial or part numbers too.

Model L-1011-385-1, L-1011-385-1-14, and L-1011- 385-1-15 series airplanes, equipped with lower deck galleys; 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 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.

Required as indicated, unless accomplished previously. To prevent fatigue cracking of the primary and secondary drive shafts, which could result in complete fracturing of the secondary shaft, and consequent dropping of the galley lift to the bottom of the shaft and possible injury to crewmembers, accomplish the following: (a) Within 18 months after the effective date of this AD, modify the power drive units and the lower drive sprocket assemblies of the galley lift system in accordance with Lockheed Service Bulletin 093- 25-294, Revision 2, dated April 13, 1981. Note 2: The Lockheed service bulletin references Lear Siegler, Inc., Service Bulletins 21192-25-08, Revision 1, dated October 19, 1979; 21192-25-09, dated August 17, 1979; and 65806-25-03, dated June 9, 1979; as additional sources of service information for modification of the power drive units and the lower drive sprocket assemblies. (b) As of the effective date of this AD, no person shall install on any airplane a power drive unit of the galley lift system having Lockheed part number (P/N) 671980-191 (Lear Siegler P/N 21192-004) or a lower drive sprocket assembly having Lockheed P/N 671980-171 (Lear Siegler P/N 65806-313) unless it has been modified in accordance with this AD. (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 Manager, Atlanta Aircraft Certification Office (ACO), FAA, Small 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, Atlanta ACO. Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Atlanta ACO. (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) The modification shall be done in accordance with Lockheed Service Bulletin 093-25-294, Revision 2, dated April 13, 1981, which contains the following list of effective pages: [[Page 2558]] ------------------------------------------------------------------------ Revision level Page No. shown on page Date shown on page ------------------------------------------------------------------------ 1, 3.......................... 2.............. April 13, 1981. 2, 4-13....................... Original....... June 29, 1979. ------------------------------------------------------------------------ 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 Lockheed Aeronautical Systems Support Company (LASSC), Field Support Department, Dept. 693, Zone 0755, 2251 Lake Park Drive, Smyrna, Georgia 30080. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at FAA, Small Airplane Directorate, Atlanta Aircraft Certification Office, One Crown Center, 1895 Phoenix Boulevard, suite 450, Atlanta, Georgia; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (f) This amendment becomes effective on February 19, 1999. Issued in Renton, Washington, on January 7, 1999. John J. Hickey, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 99-810 Filed 1-14-99; 8:45 am] BILLING CODE 4910-13-P