ASN Wikibase Occurrence # 296376
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| Date: | Sunday 1 December 2002 |
| Time: | 13:10 LT |
| Type: |  Bell 47G-3B-1 |
| Owner/operator: | Bureau Of Land Managment |
| Registration: | N48020 |
| MSN: | 2812 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 7471 hours |
| Engine model: | Lycoming TVO-435-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Panaca, Nevada -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Caliente, NV |
| Panaca, NV | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter experienced a loss of engine power and landed hard during an autorotation, severing the tail boom. The number 6 cylinder's intake valve separated, with the valve's head wedged in the intake valve seat bore. Removal of the rocker box cover on that cylinder revealed that the spring retainer was broken into numerous pieces. The piston head showed over 15 impressions consistent in dimension to that of the valve head. After examining the number 6 cylinder, a metallurgist determined that the valve failed in between the intake valve head and the valve stem.
Probable Cause: separation of the no. 6 cylinder intake valve head from the valve stem, which resulted in a loss of engine power. The mechanism responsible for the valve failure is unknown.
Accident investigation:
 |
|
Sources:
NTSB LAX03TA043
History of this aircraft
Other occurrences involving this aircraft
| 12 September 2003 | N48020 | Private | 0 | Diamond, Oregon | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Oct-2022 19:51 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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