AD 77-18-07
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
Possible jammed elevator drive system on the horizontal stabilizer of the primary pitch control system which can result in degradation of the airplane controllability.
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Required Actions
Initiate an exterior visual check of the elevator/stabilizer surface positions prior to each take-off. Revise the Airplane Flight Manual to incorporate Pitch Axis Control Assist Procedures within 30 days. Inspect elevator quadrant bearings within 150 hours time in service. Modify the elevator drive systems within 1500 hours time in service or by March 1, 1978.
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Compliance Time
Within the specified timeframes: next flight after effective date for initial check program, 30 days for AFM revision, 150 hours time in service for bearing inspection, and 1500 hours time in service or March 1, 1978 for drive system modification.
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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, and L-1011-385-3.
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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