AD 56-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Curtiss-Wright Corporation | C632S | CURTISS Models C632S, C634D and C634S Propellers |
| aircraft | Curtiss-Wright Corporation | C634D | CURTISS Models C632S, C634D and C634S Propellers |
| aircraft | Curtiss-Wright Corporation | C634S | CURTISS Models C632S, C634D and C634S Propellers |
Unsafe Condition
Failure or malfunction of low pitch limit switches P/N 110425 and P/N 154592 beyond normal service wear could result in improper pitch control or loss of pitch limitation function.
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Required Actions
Replace low pitch limit switches P/N 110425 at intervals not exceeding specified flight hours per aircraft type. Disassemble and visually inspect low pitch limit switches P/N 154592 at the same intervals, checking for proper operation and mechanical/electrical condition; replace parts or assembly if adverse conditions are found.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
Curtiss-Wright Corporation Models C632S, C634D, and C634S Propellers installed on Douglas DC-6, Lockheed 749, Lockheed 1049, and Convair 240 Series Aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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