AD 47-49-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 49, 649, and 749 |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 49, 649, and 749 |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 49, 649, and 749 |
Unsafe Condition
Loose fuel dump valve shaft gland nuts and valves on drain lines, crossfeed lines, and cabin heater fuel lines could permit leakage or hazardous conditions.
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Required Actions
Inspect fuel dump valve shaft gland nuts (serials up to 2075) and valves on drain lines, crossfeed lines, and cabin heater fuel lines (serials 2047-2088 and 2501-2503) at intervals not exceeding 50 hours of operation to ensure they are tight. Safety wiring may discontinue inspections.
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Compliance Time
At periods not to exceed 50 hours of operation
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Affected Aircraft
Lockheed Models 49, 649, and 749 with serial numbers up to 2075 for part (a), and serials 2047-2088, 2501-2503 for part (b)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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