AD 68-09-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 1329-23A | LOCKHEED Model 1329 Airplanes |
| aircraft | Lockheed Martin Corporation | 1329-23D | LOCKHEED Model 1329 Airplanes |
| aircraft | Lockheed Martin Corporation | 1329-23E | LOCKHEED Model 1329 Airplanes |
Unsafe Condition
Stress corrosion cracks in the wing skin risers at the riser-skin intersection have been experienced on Lockheed Model 1329 and military C-140 series airplanes.
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Required Actions
Within 15 days after the effective date, inspect all aircraft per Lockheed-Georgia Service Bulletin 329-257 and Supplement 329-257A or equivalent. If cracks are found, reinspect every 180 days. Repeat inspections annually or every twelve months, limited to Phase I and II as per the same service bulletins.
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Compliance Time
Within 15 days after the effective date of this AD
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Affected Aircraft
Lockheed Model 1329 airplanes, serial numbers 5001 through 5029 and 5031 through 5055
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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