AD 59-07-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Curtiss-Wright Corporation | C634S | CURTISS Models C634S-C400 and C634S-C500 Series Propellers |
Unsafe Condition
Excessive 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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect rotor assembly P/N 113330 and drive sleeve P/N 102664 splines, and rear motor shaft bearing fit at each 500-600 hours' flying time. Discontinue mixture of Molybdenum Disulfide in spline lubricant and use only Lubriplate 315. Inspect as directed in Curtiss-Wright Corporation Propeller Division letters dated December 5, 1958, and March 20, 1959, and replace worn parts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
CURTISS Models C634S-C400 and C634S-C500 Series Propellers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.