AD 89-20-07 ACTIVE

89-20-07 LOCKHEED AERONAUTICAL SYSTEMS COMPANY: Amendment 39-6327. (Docket No. 89-NM-165-AD)

Applicability: All Model L-1011 series airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent fuel leaking in the pylon leading to premature fuel exhaustion or fire, accomplish the following:

A. Within 500 hours time-in-service after the effective date of this AD, unless already accomplished within the last 1,600 hours time-in-service, and thereafter at intervals not to exceed 2,100 hours time-in-service from the last inspection, accomplish the following:

1. Visually inspect the fuel feed line in Number 1 and Number 3 pylons between pylon stations PS89 and PS166 for clearance and chafing, as follows:

a. The fuel line must have no evidence of chafing, and a minimum of 0.25 inch clearance must exist between it and the hydraulic lines.

b. If there is less than 0.25 inch clearance between the fuel line and the hydraulic lines, reposition to obtain a minimum of 0.25 inch clearance prior to further flight.

c. If the fuel line has evidence of chafing, repair or replace the line prior to further flight. A minimum of 0.25 inch clearance between the fuel line and the hydraulic lines is required.

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, Los Angeles Aircraft Certification Office, 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, Los Angeles 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 in order to comply with the requirements of this AD.

This amendment (39-6327, AD 89-20-07) becomes effective on October6, 1989.