AD 78-18-06
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
Failure of the center engine 'S' duct flexible fire seal could allow transfer of hazardous vapors from the engine compartment into the afterbody.
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Required Actions
Inspect the center engine 'S' duct flexible fire seal for groove depth and tears per SB 093-54-030. Depending on inspection results, retain, repair, replace, or reinspect the seal within specified intervals. Install chafing protection (Belt Assembly 1619429-101) to terminate AD requirements.
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Compliance Time
Within the next 1000 hours time in service if total time on effective date was ≥7500 hours, or prior to 8500 hours total time in service if total time was <7500 hours on effective date.
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Affected Aircraft
Lockheed-California Company Model L-1011-385 Series airplanes certificated in all categories, including models L-1011-385-1, L-1011-385-1-14, L-1011-385-1-15, L-1011-385-3.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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