AD 92-06-01

92-06-01 BOEING: Amendment 39-8181. Docket No. 91-NM-169-AD.

Applicability: Model 747-200, 747-300, and 747-400 series airplanes, equipped with General Electric CF6-80C2 engines; as listed in Boeing Service Bulletin 747-28-2153, dated July 18, 1991, and Boeing Service Bulletin 747-28-2154, dated June 27, 1991; certificated in any category.

Compliance: Required within 6 months after the effective date of this AD, unless accomplished previously.

To prevent the possibility of a fire as a result of fuel leaks, accomplish the following:

(a) For airplanes listed in Boeing Service Bulletin 747-28-2153, dated July 18, 1991: Replace one fuel tube in the number one engine strut and two fuel tubes in the number four engine strut in accordance with the procedures described in that service bulletin.

(b) For airplanes listed in Boeing Service Bulletin 747-28-2154, dated June 27, 1991: Replace two fuel tubes in the number three strut in accordance with the proceduresdescribed in that service bulletin.

(c) An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. The request shall be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Seattle ACO.

(d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(e) The replacement shall be done in accordance with Boeing Service Bulletin 747- 28-2153, dated July 18, 1991, or Boeing Service Bulletin 747-28-2154, dated June 27, 1991. 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. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, DC.

(f) This amendment becomes effective on April 13, 1992.