Hartzell; HC-C2YK-1BF; Incorrect Assembly Parts; ATA 6122

Hartzell; HC-C2YK-1BF; Incorrect Assembly Parts; ATA 6122

The propeller’s governor (P/N F2-7A) discrepancies included RPM control issues and a history of leaking. The submitting technician states, “During disassembly, the pilot-spool shaft (P/N 54696) threads were found to be damaged. It was discovered that during the previous assembly of this part a fine thread B3808-4 nut was used in place of the required B3808 (course thread) nut. The B3808-4 was forced onto the pilot-spool, distorting and cross-threading (the part). The unit was reported to have been overhauled in March of 1994, having approximately 200 hours (accumulated time).”

Part Total Time: unknown.

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