ASN Wikibase Occurrence # 286764
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| Date: | Friday 24 July 2009 |
| Time: | 13:45 LT |
| Type: |  Sikorsky S-55 |
| Owner/operator: | Private |
| Registration: | N1255T |
| MSN: | 55607 |
| Total airframe hrs: | 7530 hours |
| Engine model: | Aireasearch TSE331 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chelan, Washington -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | Chelan, WA |
| Chelan, WA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was using rotor wash to dry cherries at low altitude when the helicopter lost hydraulic pressure. After clearing a stand of trees, the pilot made an emergency run-on landing into a vacant field. During the landing, one of the landing skids hit a large hole, and the main rotor severed the tail boom. Post accident examination revealed that an internal seal had leaked resulting in the loss of pressure in the hydraulic system.
Probable Cause: Failure of a seal in the hydraulic system resulting in a loss of hydraulic pressure while maneuvering at low altitude.
Accident investigation:
 |
|
Sources:
NTSB WPR09LA371
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Oct-2022 15:43 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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