AD 59-18-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Curtiss-Wright Corporation | C634S | CURTISS Models C634S-C400 and C634S-C500 Series Propellers |
Unsafe Condition
Peculiar wear of power unit motor and mating speed reducer splines in Curtiss C634S-C400 and C634S-C500 Series propellers has been observed at a time short of a full overhaul period.
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Required Actions
Install a new motor rotor assembly with a longer shaft and larger pitch diameter splines, along with a new mating splined sleeve and high speed drive gear. Modify the 145295-2 power unit assembly to the 163308 power unit assembly.
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Compliance Time
at first propeller overhaul after January 1, 1960, but not later than May 1, 1960
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Affected Aircraft
Curtiss-Wright Corporation Models C634S-C400 and C634S-C500 Series Propellers, all serial numbers
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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