AD 91-02-01

91-02-01 BOEING: Amendment 39-6855. Docket No. 90-NM-277-AD.

Applicability: Model 757 series airplanes equipped with Pratt & Whitney engines, as listed in Boeing Alert Service Bulletin 757-29A0038, Revision 1, dated November 8, 1990, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent the possibility of fuel leakage in the engine strut, accomplish the following: A. Within 45 days after the effective date of this AD, accomplish the following in accordance with Boeing Alert Service Bulletin 757-29A0038, Revision 1, dated November 8, 1990:

1. Visually inspect the retainer channel and fuel tubing within the engine strut for damage. If any damage is detected, repair prior to further flight.

2. Replace the aluminum retainer channel at station 179 with an inconel retainer channel.

B. Within 30 days after accomplishing the inspection required by paragraph A. of this AD, submit a report of inspection findings from those inspections from which it was determined that the aluminum tube support retainer channel was damaged, to the Manager, Seattle Aircraft Certification Office, 1601 Lind Avenue S.W., Renton, Washington 98055-4056; rapid fax: (206) 227-1181.

C. An alternate means 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.

NOTE: The request should be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Seattle ACO.

D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.

This amendment (39-6855, AD 91-02-01) becomes effective on January 22, 1991.