NTSB Identification: FTW95LA145.
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Accident occurred Thursday, March 23, 1995 in GILLETT, AR
Probable Cause Approval Date: 06/19/1995
Aircraft: AERO COMMANDER S2R, registration: N5561X
Injuries: 1 Uninjured.

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

DURING AN AERIAL APPLICATION PASS THE ENGINE OIL PRESSURE DROPPED TO 40 PSI AND THE ENGINE LOST ALL POWER. THE AIRPLANE SLID INTO TREES DURING THE FORCED LANDING. AN ENGINE TEARDOWN REVEALED THAT THE ENGINE OIL PASSAGES WERE BLOCKED BY PIECES OF METAL WORN FROM THE MAIN ROD BEARING WHICH WAS SEIZED TO THE CRANKSHAFT. GEAR SPLINES WERE SEPARATED FROM THE CAM GEAR AND CAM GEAR DRIVE. THE CONDITION WAS DESCRIBED AS 'TYPICAL OF A HIGH TIME BEARING FAILURE.' THE ENGINE HAD 1,549 HOURS SINCE OVERHAUL. TBO WAS 1,200 HOURS.

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

THE ENGINE MAIN ROD BEARING SEIZED TO THE CRANKSHAFT DUE TO WORN MASTER ROD METAL PIECES BLOCKING THE OIL PASSAGES. A FACTOR WAS AN ENGINE OVERHAUL WAS NOT PERFORMED BY COMPANY MAINTENANCE PERSONNEL.

Full narrative available

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