AD 79-14-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED CALIFORNIA Model L-1011-385-1 Series Airplanes |
Unsafe Condition
Uncontrolled pressure buildup in the hydraulic system return lines which could reduce flight control capability.
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Required Actions
Remove the hydraulic system return filter module inlet shutoff valve assemblies per Lockheed Service Bulletin 093-29-069. Equivalent modifications may be approved by the Chief, Aircraft Engineering Division, FAA Western Region. Special flight permits may be issued under FAR 21.197 and 21.199 to operate the airplane to a base for modifications.
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Compliance Time
within the next 350 hours time in service
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Affected Aircraft
Lockheed Martin Corporation L-1011-385-1 series airplanes certificated in all categories
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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