59-07-01 CURTISS: Applies to Models C634S-C400 and C634S-C500 Series Propellers.
Compliance required as indicated.
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. Accordingly:
(1) 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.
(2) Discontinue mixture of Molybdenum Disulfide in spline lubricant. Use only Lubriplate 315.
Inspect as directed in Curtiss-Wright Corporation Propeller Division letters to all operators of Lockheed 749 and 1049 Series aircraft dated December 5, 1958, and March 20, 1959. Worn parts must be replaced.
This supersedes AD 58-25-02.