AD 80-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED-CALIFORNIA COMPANY Model L-188A and L-188C Airplanes |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED-CALIFORNIA COMPANY Model L-188A and L-188C Airplanes |
Unsafe Condition
Rapid decompression, door warning failure, or loss of cargo door.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard prohibiting pressurized flight within 15 hours' time in service from the AD effective date. Inspect cargo doors and sills using visual, magnetic particle, and dye penetrant methods per specified Lockheed Alert Bulletins. Repair as required. For pressurized aircraft, install door reinforcements, re-rig the door, and inspect within 5,000 hours' time in service. Rewire door warning light circuitry per drawing 4036666, Rev D within 5,000 hours. Unpressurized aircraft must also install reinforcements and inspect within 5,000 hours. Alternative actions may be approved by FAA.
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Compliance Time
Within 15 hours' time in service from the effective date of this AD except for those to whom it was made effective earlier by telegraphic AD T80WE-11 dated February 22, 1980.
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Affected Aircraft
Lockheed-California Company Model L-188A and L-188C airplanes with Supplemental Type Certificate SA1754WE, SA1831WE, or SA2536WE (cargo door modification).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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