AD 87-08-06

87-08-06 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-5594. Applies to Lockheed Model L-1011-385 series airplanes, equipped with Dynamic Controls Corporation oxygen initiator sequence timer switch(es), P/N's 11035-2/-3, certificated in any category. Compliance required as indicated, unless previously accomplished.

To prevent malfunction of the passenger oxygen system due to dormant shorted electromagnetic interference filter capacitors in the oxygen initiator sequencer timer switch(es), accomplish the following:

A. Within 12 months after the effective date of this airworthiness directive (AD), modify P/N's 11035-2 and -3 oxygen initiator sequencer timer switches in accordance with Part II of the Accomplishment Instructions of Lockheed Service Bulletin 093-35-041, Revision 3, dated November 6, 1986, or later revisions approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region.

B. Alternate means of compliance which provide 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 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 Lockheed-California Company, P.O. Box 551, Burbank, California 91520, Attention: Commercial Order Administration, Dept. 65-33, U-33, B-1. 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 May 5, 1987.