AD 59-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049-54 | LOCKHEED Models 049, 149, 649, 649A, 749, 749A, and 1049-54 Aircraft |
| aircraft | Lockheed Aircraft Corporation | 149-46 | LOCKHEED Models 049, 149, 649, 649A, 749, 749A, and 1049-54 Aircraft |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 049, 149, 649, 649A, 749, 749A, and 1049-54 Aircraft |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 049, 149, 649, 649A, 749, 749A, and 1049-54 Aircraft |
| aircraft | Lockheed Aircraft Corporation | 649A-79 | LOCKHEED Models 049, 149, 649, 649A, 749, 749A, and 1049-54 Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 049, 149, 649, 649A, 749, 749A, and 1049-54 Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | LOCKHEED Models 049, 149, 649, 649A, 749, 749A, and 1049-54 Aircraft |
Unsafe Condition
Fatigue failures in the fillet radius of the main landing gear downlock guide stub, P/N 270201-3.
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Required Actions
Inspect for fatigue cracks in the main landing gear downlock guide stub fillet radius using magnetic inspection within 150 flight hours. Replace the entire main landing gear guide assembly (P/N 270197) with P/N 318332 if cracks are found. Reinspect every 60 flight hours until replacement is completed. Replace P/N 270197 with P/N 318332 by the first block overhaul after July 1, 1959, or no later than July 1, 1960.
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Compliance Time
within the next 150 flight hours
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Affected Aircraft
All Lockheed Models 049, 149, 649, 649A, 749, 749A, and 1049-54 Aircraft except those already incorporating the improved main landing gear downlock guide assembly per Lockheed Service Bulletins 49/SB-707 and 1049/SB-2021.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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