AD 76-09-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-3 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385 Series Airplanes |
Unsafe Condition
Separation of the center engine S-duct assembly due to failure of the articulating joints, potentially caused by damaged alignment units, worn attachment holes, or cracks in the forward ring of the articulating joint.
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Required Actions
Inspect all alignment units (leaf springs and spring cartridges) at the forward articulating joint for damage or worn holes, and inspect the forward ring for cracks. Repair or modify as necessary before further flight. Repeat inspections at intervals not exceeding 800, 1600, or 2400 hours' time in service until modifications per Service Bulletin 093-54-019 are completed.
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Compliance Time
Within the next 250 hours' time in service after July 14, 1975, or before the accumulation of 4,500 hours' time in service, whichever occurs later, unless already accomplished.
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Affected Aircraft
Lockheed-California Company Model L-1011-385 series airplanes with Part I configuration center engine S-duct installed, including serials 1002 through 1037.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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