- Model
- C634S
- Data sheet
- TCDSP-825
- Product
- Propeller
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
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On this page
The airworthiness directive
59-18-03 CURTISS: Applies to All Models C634S-C400 and C634S-C500 Series Propellers. Compliance required at first propeller overhaul after January 1, 1960, but not later than May 1,1960.
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. In order to minimize the possibility of such occurrences, provide a new motor rotor assembly which incorporates a longer shaft with splines of a larger pitch diameter and a new mating splined sleeve and high speed drive gear. Modification of the 145295-2 power unit assembly in Curtiss C634S-C400 and C634S-C500 Series propellers to the 163308 power unit assembly accomplishes the desired objective.
(Curtiss Service Bulletin No. C-24 covers this same subject.)
Compliance with AD 59-07-01 is no longer required after compliance with this AD.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.