AD 74-18-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED Model L-1011 Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED Model L-1011 Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED Model L-1011 Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-3 | LOCKHEED Model L-1011 Airplanes |
Unsafe Condition
Inadvertent activation of the automatic ground speed brakes could occur, leading to unsafe conditions.
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Required Actions
Deactivate the automatic ground speed brake (AGSB) system and install placards as specified in Lockheed Alert Service Bulletin 093-22-A066 or equivalent approved procedures. Modify FCES computers and proximity logic boxes per specified service bulletins, update maintenance and flight manuals, and amend operating procedures to include flight crew monitoring of the speed brake lever.
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Compliance Time
Prior to further flight
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Affected Aircraft
Lockheed Model L-1011-385-1, L-1011-385-1-14, L-1011-385-1-15, L-1011-385-3 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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