ASN Wikibase Occurrence # 366870
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| Date: | Thursday 31 May 1990 |
| Time: | 09:45 LT |
| Type: |  Bell 47G-3B1 |
| Owner/operator: | Private |
| Registration: | N39268 |
| MSN: | 2957 |
| Year of manufacture: | 1965 |
| Total airframe hrs: | 5720 hours |
| Engine model: | LYCOMING VO-435-A1 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Becket, MA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Pittsfield, MA (KPSF) |
| Westfield, MA (KBAF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER ENGINE LOST POWER AND THE PILOT AUTOROTATED INTO UNSUITABLE TERRAIN. THE CAUSE OF THE POWER LOSS WAS A OIL CHANNEL WHICH WAS BLOCKED WITH DEBRIS AND LED TO THE FAILURE OF THE NUMBER 4 BEARING AND CONNECTING ROD. THE ENGINE HAD BEEN OVERHAULED 6 YEARS AND 228.5 HOURS PRIOR TO THE ACCIDENT. LYCOMING SAID THEIR POST CRASH EXAMINATION OF THE ENGINE SHOWED THE OVERHAUL HAD NOT BEEN CONDUCTED IN ACCORDANCE WITH THEIR DIRECTIVES.
Probable Cause: A POWER LOSS DUE TO OIL STARVATION, AFTER MAINTENANCE PERSONNEL FAILED TO COMPLY WITH LYCOMING DIRECTIVES DURING THE ENGINE OVERHAUL. FACTORS RELATED TO THE ACCIDENT WERE: IMPROPER ADJUSTMENT OF THE ENGINE OIL PRESSURE BY MAINTENANCE PERSONNEL AND UNSUITABLE TERRAIN.
Accident investigation:
 |
|
Sources:
NTSB NYC90LA122
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Mar-2024 12:59 | ASN Update Bot | Added |
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