ASN Wikibase Occurrence # 295082
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| Date: | Thursday 16 October 2003 |
| Time: | 12:24 LT |
| Type: |  Bell UH-1B |
| Owner/operator: | Porter Flying Services, Inc. |
| Registration: | N234SJ |
| MSN: | 388 |
| Year of manufacture: | 1962 |
| Total airframe hrs: | 7538 hours |
| Engine model: | Honeywell T53-L-11D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Durham, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Durham, CA |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter landed hard and rolled over during an autorotation following a loss of engine power. The pilot was demonstrating crop dusting turns and maneuvers for school children. He had completed several simulated passes over a field. He returned to the middle of a field, and turned into a light wind in preparation for landing. The helicopter lost power and entered an unexpectedly rapid descent. He was unable to prevent a hard landing and rollover. The teardown and examination of the engine disclosed that the power turbine shaft retaining bolt had failed in overload, allowing the shaft to float in a fore and aft manner and eventually damaging the blades on the power turbine disk. The type and degree of damage to the turbine section shafting and related components was indicative of the separation of the bolt at some undetermined point in time prior to the accident flight.
Probable Cause: Separation of the power turbine shaft retaining bolt resulting in extensive power turbine area damage and a loss of shaft output power.
Accident investigation:
 |
|
Sources:
NTSB LAX04LA015
History of this aircraft
Other occurrences involving this aircraft
| 2 March 2023 | N234SJ | Porter Flying Services Inc | 0 | Orland, CA | |
sub |
| Fuel exhaustion | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Oct-2022 17:44 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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