NTSB Identification: LAX94FA309.
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Accident occurred Saturday, August 06, 1994 in MOHAVE VALLEY, AZ
Probable Cause Approval Date: 12/19/1995
Aircraft: AERO COMMANDER 112, registration: N1018J
Injuries: 3 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE AIRPLANE LANDED HARD AND FLIPPED OVER IN A DESERT WASH AFTER A TOTAL LOSS OF POWER. EXAMINATION OF THE ENGINE REVEALED THE NUMBER 4 PISTON CONNECTING ROD FAILED AS A RESULT OF LACK OF LUBRICATION. FURTHER EXAMINATION OF THE ENGINE DISCLOSED THE ENGINE CRANKCASE HALVES WERE REPAIRED DURING THE LAST ENGINE OVERHAUL. THE CASE HALVES WERE WELDED IN THE NUMBER 3 MAIN BEARING (CENTER) AND NUMBER 4 MAIN BEARING (REAR) BOSSES. THE OIL SUPPLY HOLE THAT SUPPLIES OIL TO THE NUMBER 4 CONNECTING ROD WAS FOUND WELDED OVER AND NOT BORED AFTER THE REPAIR. THE ENGINE WAS OVERHAULED 1,420 HOURS BEFORE THE ACCIDENT.

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

Failure of the certified flight instructor to properly judge the flare to avert a hard landing, and the failure of other maintenance personnel to properly repair the engine case halves during engine overhaul. A factor in the accident was the uneven relief of the desert terrain.

Full narrative available

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