ASN Wikibase Occurrence # 284778
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| Date: | Tuesday 12 June 2007 |
| Time: | 07:05 LT |
| Type: |  Bell UH-1B |
| Owner/operator: | Jones Aviation Inc. |
| Registration: | N2087S |
| MSN: | 734 |
| Year of manufacture: | 1963 |
| Total airframe hrs: | 8105 hours |
| Engine model: | Lycoming T53-13B-22 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Biggs, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Agricultural |
| Departure airport: | Biggs, CA |
| Biggs, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
As the helicopter lifted off from the top of a chemical truck the pilot heard a faint whining sound, which got louder and then abruptly stopped when the helicopter had cleared the truck. After the whining stopped, the helicopter flight controls locked up, but despite the restriction the pilot managed to pull a small amount of aft cyclic to help the helicopter settle to the ground. On touchdown the helicopter drifted to the right, then skidded across the ground before experiencing a dynamic rollover. The pilot reported that the hydraulic pump, which supplies hydraulic power to the flight control system servos, failed. A postaccident examination of the hydraulic pump, which sustained impact damage as result of the accident sequence, failed to reveal why the pump had failed. An FAA inspector reported that the hydraulic pump had been removed from a salvaged helicopter in 2000, and had not been used prior to being installed on the accident aircraft, about a month and a half before the accident. The inspector also reported that the pump's condition was unknown and that it was never tested prior to being installed on the helicopter.
Probable Cause: Loss of control during hover for undetermined reasons.
Accident investigation:
 |
|
Sources:
NTSB SEA07LA154
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Oct-2022 07:24 | ASN Update Bot | Added |
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