AD 89-13-08

89-13-08 BOEING: Amendment 39-6241. Applicability: Model 757 series airplanes, listed in Boeing Service Bulletin 757-32- 0083, dated December 15, 1988, certificated in any category.

Compliance: Required within the next 750 landings after the effective date of this AD or prior to the accumulation of 10,000 landings, whichever occurs later, unless previously accomplished.

To prevent the partial loss of braking and, potentially, the complete loss of braking, accomplish the following:

A. Replace aluminum brake metering valve actuation shafts with steel shafts, in accordance with Boeing Service Bulletin 757-32-0083, dated December 15, 1988.

B. 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, FAA, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Seattle Aircraft Certification Office.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of the inspections and/or modifications required by this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6241, AD 89-13-08) becomes effective on July 24, 1989.