AD 84-09-51 R1
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
Depressurization of the aircraft due to failure of the negative pressure relief valve.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the negative pressure relief valve mounting adapters within 100 flight hours. If cracks are found, replace or repair the adapter before next flight. Install specific stainless steel clips with required dimensions and fasteners for repairs or reinforcements. Repeat inspections at intervals not exceeding 25 landings or 500 landings depending on repair status, and comply with reinforcement requirements within 350 flight hours after last inspection or AD receipt.
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Compliance Time
Within 100 flight hours after the receipt of this AD
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Affected Aircraft
Lockheed Model L-1011-385 series airplanes, specifically serial numbers 1001 through 1250, and aircraft with replaced negative pressure relief valve adapters.
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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