AD 81-26-51 R3
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
Cracks in the Fuselage Station (FS) 1363 bulkhead lower caps, fuselage skin, adjacent web, and web horizontal stiffeners could lead to failure and possible sudden decompression of the airplane.
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Required Actions
Inspect for cracks in FS 1363 bulkhead cap and surrounding areas using specified service bulletins. Repetitive inspections are required at intervals not exceeding 2000 landings internally and 600 landings externally. Repairs must be made before further flight if cracks are found.
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Compliance Time
Compliance is required within 300 landings after the effective date (September 21, 1983) for aircraft with 10,000 or more landings as of that date. Aircraft with fewer landings must complete initial inspection prior to 10,300 landings. Repetitive inspections must be conducted at specified intervals.
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Affected Aircraft
Lockheed-California Company Model L-1011-385 series airplanes, serial numbers 1052 and subsequent, 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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