AD 75-07-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED Model L-1011-385-1 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED Model L-1011-385-1 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED Model L-1011-385-1 Series Airplanes |
Unsafe Condition
The possibility of an out-of-trim Autopilot upon manual disconnect occurring at close proximity to the ground, and operation at speeds where the airplane may not meet stability requirements with inoperative MACH TRIM and MACH FEEL systems, and incorrect failure annunciations.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install the placard 'DUAL PITCH TRIM REQ'D TO 100 FT. FOR A/P USE BELOW 100 FT.' within 100 hours time in service after the effective date. Revise AFM Limitations sections LR 25925 and LR 25225 with specified pages or later FAA-approved revisions, and update operations manuals. Modify Trim Augmentation Computers per Service Bulletin 093-22-069 by July 1, 1977. Operators may remove placards after all computers are modified and parts pooling is established.
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Compliance Time
within 100 hours time in service after the effective date of this AD
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Affected Aircraft
Lockheed Model L-1011-385-1 series airplanes certificated in all categories, including L-1011-385-1, L-1011-385-1-14, L-1011-385-1-15 models.
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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