- Effective
- July 16, 1978
- Models
- L-1011-385-1, L-1011-385-1-14, L-1011-385-1-15
- Data sheet
- TCDSA23WE
- Registered aircraft
- 3 matched by model
- Product
- Aircraft · Large airplane
- Amendment
- 39-3511
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
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On this page
The airworthiness directive
79-14-03 LOCKHEED CALIFORNIA: Amendment 39-3511. Applies to Lockheed L-1011-385-1 series airplanes certificated in all categories.
Compliance required within the next 350 hours time in service, unless already accomplished.
To prevent uncontrolled pressure buildup in the hydraulic system return lines and to maintain full flight control capability, accomplish the following:
(a) Remove the hydraulic system return filter module inlet shutoff valve assemblies from the hydraulic system return filter modules per Lockheed Service Bulletin 093-29-069, dated June 27, 1979.
(b) Equivalent modifications may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.
(c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a base to perform the required modifications.
This amendment becomes effective July 16, 1978.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 3
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.