AD 51-05-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Double Wasp CA15 | PRATT & WHITNEY Models R-2800-34M1, -83AM3, -83AM4, and Double Wasp CA Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA17 | PRATT & WHITNEY Models R-2800-34M1, -83AM3, -83AM4, and Double Wasp CA Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA18 | PRATT & WHITNEY Models R-2800-34M1, -83AM3, -83AM4, and Double Wasp CA Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA19 | PRATT & WHITNEY Models R-2800-34M1, -83AM3, -83AM4, and Double Wasp CA Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA3 | PRATT & WHITNEY Models R-2800-34M1, -83AM3, -83AM4, and Double Wasp CA Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA5 | PRATT & WHITNEY Models R-2800-34M1, -83AM3, -83AM4, and Double Wasp CA Series Engines |
| engine | Pratt & Whitney Division | Military R-2800 Series | PRATT & WHITNEY Models R-2800-34M1, -83AM3, -83AM4, and Double Wasp CA Series Engines |
Unsafe Condition
Engines may fail to develop the selected power level during takeoff when using Antidetonant Injection (Wet Power), potentially compromising aircraft performance and safety.
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Required Actions
Operators must select and maintain a power level, measure engine power at specified intervals (installation, midpoint, end of service time), and ensure compliance with FAA-acceptable methods. Non-compliant engines must restore power, replace engines, or reduce operating weights.
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Compliance Time
Compliance required as soon as possible but not later than February 15, 1951.
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Affected Aircraft
Pratt & Whitney Models R-2800-34M1, -83AM3, -83AM4, and Double Wasp CA Series engines installed on Douglas DC-6 and Convair 240 aircraft using Antidetonant Injection (Wet Power) for takeoff.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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