AD 65-21-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Models 188A and 188C Series Airplanes |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Models 188A and 188C Series Airplanes |
Unsafe Condition
Cracks in the vertical stabilizer-to-fuselage attach channel, P/N 803179-5, located at Fuselage Station 1117.6, could lead to structural failure.
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Required Actions
Inspect the vertical stabilizer-to-fuselage attach channel visually or with FAA-approved methods for cracks. If cracks are found, stop drill cracks under 3 inches and install specific angles, or replace the channel and install angles for cracks over 3 inches, both before further flight except under FAR 21.197. Periodic reinspections are required unless repairs or reinforcements are made.
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Compliance Time
Within the next 150 hours' time in service for airplanes with 8,000+ hours as of the effective date (October 11, 1965), unless accomplished within 1,350 hours prior. For those with less than 8,000 hours, comply prior to 8,150 hours' time in service unless done between 6,650 and 8,000 hours. Thereafter, inspections at intervals not exceeding 1,500 hours' time in service.
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Affected Aircraft
Lockheed Models 188A and 188C Series Airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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