AD 85-07-05 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED AERONAUTICAL SYSTEMS COMPANY Model L-1011 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED AERONAUTICAL SYSTEMS COMPANY Model L-1011 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED AERONAUTICAL SYSTEMS COMPANY Model L-1011 Series Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-3 | LOCKHEED AERONAUTICAL SYSTEMS COMPANY Model L-1011 Series Airplanes |
Unsafe Condition
The potential for unrecoverable loss of all AC/DC electrical power, including the emergency bus, due to thermal overheat sensor deficiencies and inadequate duct isolation barrier.
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Required Actions
Extend and reroute Fenwall thermal overheat sensors below the Mid-Electrical Service Center (MESC) floor, remove excess flow sensors, modify structure below the MESC floor, extend the duct isolation barrier, further extend the duct isolation barrier, add overheat sensors, and revise insulation blanket retention as per specified service bulletins.
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Compliance Time
Within 3,600 flight hours after May 9, 1985, and within 3,600 flight hours after November 13, 1989.
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Affected Aircraft
Lockheed Aeronautical Systems Company Model L-1011 series airplanes, Serial Numbers -1002 through -1221, not modified per Service Bulletin 093-21-184.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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