AD 87-08-04

87-08-04 BOEING: Amendment 39-5593. Applies to Model 757 series airplanes equipped with Rolls Royce RB211-535E4 engines, as listed in Boeing Service Bulletin 757-78-0010, dated December 23, 1986, certificated in any category. Compliance required as indicated, unless previously accomplished.

To maintain the fire integrity of the thrust reverser C-ducts, accomplish the following within the next 250 flight hours after the effective date of this AD:

A. Inspect and repair, if necessary, the thermal blanket in the upper 45 degree section of the C-ducts, as described in Boeing Service Bulletin 757-78-0010, dated December 23, 1986, or later FAA-approved revision. Any damage to the thermal blanket (such as holes, splits, and tears) must be repaired prior to further flight.

B. Inspect and repair, if necessary, the thermal blanket in the lower section of the C- ducts and engine components, as described in the Boeing Service Bulletin 757-78-0010, dated December 23, 1986, or later FAA-approved revisions. Any damage discovered must be repaired within the next 250 flight hours.

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, FAA, Northwest Mountain Region.

D. 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 inspections and/or repair required by 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 the Boeing Commercial Airplane Company, P. O. Box 3707, Seattle, Washington 98124-2207. This information may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment becomes effective April 16, 1987.