AD 96-22-01 Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes

Models named: 747-200, -300, -400 series. Read the applicability below — it usually turns on serial or part numbers too.

Model 747-200, -300, and -400 series airplanes having cumulative line number (C/L) 696 through 1057, inclusive; equipped with Parker inboard elevator power control packages (PCP) having part numbers (P/N) 93600-5005 through -5051 inclusive, or P/ N's 327400-1001, -1003, -1005, and -1007; certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise 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 uncommanded elevator deflection, which could result in structural damage and reduced controllability of the airplane, accomplish the following: (a) For Model 747-400 series airplanes, as listed in Boeing Alert Service Bulletin 747-27A2348, Revision 1, dated January 26, 1995: Within 1 year after the effective date of this AD, modify the hydraulic tubing of the right inboard elevator PCP, in accordance with Boeing Alert Service Bulletin 747-27A2348, Revision 1, dated January 26, 1995. (b) For all airplanes: Within 3 years after the effective date of this AD, modify the left and right servo assemblies of the inboard elevator PCP, in accordance with Parker Service Bulletin 327400-27-171, Revision 1, dated April 14, 1995, or Parker Service Bulletin 93600-27-173, dated May 17, 1995, as applicable. (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, 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. (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 modifications shall be done in accordance with Boeing Alert Service Bulletin 747-27A2348, Revision 1, dated January 26, 1995; Parker Service Bulletin 327400-27-171, Revision 1, dated April 14, 1995; and Parker Service Bulletin 93600-27-173, dated May 17, 1995; as applicable. 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; and Parker Hannifin Corporation, Customer Support Operations, 16666 Von Karman Avenue, Irvine, California 92714. 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. (f) This amendment becomes effective on December 6, 1996. Issued in Renton, Washington, on October 15, 1996. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 96-26952 Filed 11-5-96; 8:45 am] BILLING CODE 4910-13-U