NTSB Identification: CEN12LA501
14 CFR Part 91: General Aviation
Accident occurred Wednesday, August 01, 2012 in Holly Lake Ranch, TX
Probable Cause Approval Date: 11/06/2013
Aircraft: BEECH H35, registration: N4684D
Injuries: 1 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The airplaneā€™s engine lost power during the descent to the destination airport, and the airplane struck trees during the ensuing forced landing attempt. A postaccident examination of the engine revealed that the idler gear pin was not in position and no retaining bolts were found. Additionally, the nuts from the forward left, lower through bolt on the crankcase half and the forward left engine mount bolt were missing. A logbook entry indicated that the engine had been reassembled and re-installed on the airplane about 1 week before the accident due to a previous propeller strike. Based on the available information, it is likely that the improper assembly of the engine, specifically the omission of the idler gear pin retaining bolts, resulted in the idler gear falling out of its position and a subsequent complete loss of engine power.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The incomplete maintenance performed by maintenance personnel, which resulted in a total loss of engine power.

Full narrative available

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