AD 81-18-51 R4
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | L-1011-385-1 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385-1 Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-14 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385-1 Airplanes |
| aircraft | Lockheed Martin Corporation | L-1011-385-1-15 | LOCKHEED-CALIFORNIA COMPANY Model L-1011-385-1 Airplanes |
Unsafe Condition
Cracks in the Fuselage Station (FS) 1363 bulkhead lower cap, fuselage skin, adjacent web, and web horizontal stiffeners could lead to failure and possible sudden decompression of the pressurized fuselage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for cracks in FS 1363 bulkhead and surrounding areas via visual inspection or Service Bulletin 093-53-206, repair cracks before flight, and install permanent modifications per Service Bulletin 093-53-207 to eliminate inspection requirements. Inspections must be done within 50 hours time in service after the effective date, then every 300 hours or per landing intervals as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time in service after the effective date of this AD, and at intervals not to exceed 300 hours time in service thereafter. Alternatively, for Option 2 inspections, intervals not to exceed 1000 landings (500 landings if bulkhead cap has repairs or damage).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed-California Company Model L-1011-385-1 airplanes, Serial Numbers 1001 through 1051, inclusive.
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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