ASN Wikibase Occurrence # 37374
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| Date: | Saturday 6 August 1994 |
| Time: | 15:45 LT |
| Type: |  Rockwell Commander 112 |
| Owner/operator: | Copper State Air Service |
| Registration: | N1018J |
| MSN: | 18 |
| Total airframe hrs: | 2626 hours |
| Engine model: | Lycoming IO-360-C1D6 |
| Fatalities: | Fatalities: 3 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Mohave Valley, AZ -
 United States of America
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | Bullhead City, AZ (KIFP) |
| Mesa, AZ (KFFZ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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.
Probable Cause: 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.
Accident investigation:
 |
|
Sources:
NTSB LAX94FA309
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 05:31 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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