ASN Wikibase Occurrence # 133961
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| Date: | Saturday 20 April 1996 |
| Time: | 17:00 LT |
| Type: |  Maule M-5-210C |
| Owner/operator: | Donald E. Ernst |
| Registration: | N9704N |
| MSN: | 6030C |
| Total airframe hrs: | 1850 hours |
| Engine model: | Continental IO-360-D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Grayling, AK -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | , AK (KKGX) |
| Galena, AK (GAL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The certificated private pilot departed a remote airstrip. About 1,000 feet above the ground, the engine quit. The pilot performed an emergency landing on soft snow covered terrain and the airplane nosed over. An engine examination revealed that the alternator drive coupling, consisting of a hub, retainer and bushing, fragmented within the engine. The alternator drive shaft and the oil pump gear were fractured when fragments of the retainer were enmeshed in the engine accessory gear teeth that drove both accessories. The number 6 cylinder connecting rod failed and penetrated the engine case due to a lack of lubrication. The engine, including the alternator, was overhauled 250 hours before the accident. An engine manufacturer's service bulletin recommended inspection and replacement of the standard alternator drive coupling every 500 hours. The engine manufacturer offered a one piece alternator drive coupling in which the retainer, bushing and hub were bonded together as one unit.
Probable Cause: disintegration of the alternator drive coupling, jamming of the accessory drive gear, shearing of the oil pump drive, oil starvation, and failure of the number 6 cylinder connecting rod. Non-compliance with a manufacturer's service bulletin and soft snow were factors in the accident.
Accident investigation:
 |
|
Sources:
NTSB ANC96LA053
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 07:19 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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