AD 87-04-16

87-04-16 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-5539. Applies to Lockheed Model L-1011 series airplanes equipped with carbon fibre cowls, certificated in any category. Compliance is required within 12 months after the effective date of this AD, unless already accomplished.

To prevent loss of throttle control caused by an unstowed left rear fan cowl door support on carbon fibre cowls, accomplish the following:

A. Modify the fan cowl support strut stowage mechanism in accordance with Rolls- Royce Service Bulletin RB211-71-8220, dated May 23, 1986, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

B. Alternate means of compliance which provides an acceptable level of safety may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes toa base for the accomplishment of the modification 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 Rolls-Royce PLC, P.O. Box 31, Derby DE 2 8BJ, England, Attention: Technical Publications Department. These documents may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Los Angeles Aircraft Certification Office, 4344 Donald Douglas Drive, Long Beach, California.

This amendment becomes effective March 9, 1987.