AD 91-02-03

91-02-03 BOEING: Amendment 39-6853. Docket No. 90-NM-270-AD.

Applicability: Model 767 series airplanes, listed in Boeing Alert Service Bulletin 767- 29A0054, dated March 26, 1990, and airplanes line numbers 308 and 311, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent fire caused by the chafing of wires on hydraulic components, accomplish the following:

A. For airplanes listed in Boeing Alert Service Bulletin 767-29A0054, dated March 26, 1990: Within 500 hours time-in-service after July 2, 1990 (the effective date of Amendment 39-6633, AD 90-13-06), perform the procedures required by paragraph C. of this AD.

B. For airplanes line numbers 308 and 311: Within 500 hours time-in-service after the effective date of this AD, perform the procedures required by paragraph C. of this AD.

C. Inspect the wire bundles in the aft fairing areas of the left and right engine struts to determine if sufficient separation exists between the wire bundles and hydraulic components, in accordance with Boeing Alert Service Bulletin 767-29A0054, dated March 26, 1990; Revision 1, dated May 24, 1990; or Revision 2, dated November 8, 1990. If adequate separation is not present, prior to further flight, repair, adjust the wire bundles, and install protective coverings on the wiring and hydraulic tubing in accordance with the Alert Service Bulletin.

D. 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.

E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operateairplanes 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 Airplanes, P.O. Box 3707, Seattle, Washington 98124. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington.

Airworthiness Directive 91-02-03 supersedes AD 90-13-06, Amendment 39-6633. This amendment (39-6853, AD 91-02-03) becomes effective on January 14, 1991.