AD 79-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385-1, L-1011-385-1-14, and L-1011-385-1-15 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385-1, L-1011-385-1-14, and L-1011-385-1-15 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385-1, L-1011-385-1-14, and L-1011-385-1-15 Series Airplanes |
Unsafe Condition
A potentially hazardous jam in the elevator drive system prior to takeoff can result in degradation of airplane controllability.
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Required Actions
Conduct an exterior visual check of elevator/stabilizer surface positions before each takeoff. Install the elevator drive system jam warning system by July 1, 1981, in accordance with Service Bulletin 093-27-174. Discontinue visual checks upon installation of the warning system. Correct any discrepancies prior to further flight.
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Compliance Time
Within the next ten (10) days after the effective date of this AD, or install the warning system by July 1, 1981.
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Affected Aircraft
Lockheed-California Company Model L-1011-385-1, L-1011-385-1-14, and L-1011-385-1-15 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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