ASN Wikibase Occurrence # 42592
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| Date: | Friday 11 February 2000 |
| Time: | 14:04 |
| Type: |  Bell OH-58A Kiowa |
| Owner/operator: | Utah Depart Of Public Safety |
| Registration: | N7UT |
| MSN: | 41703 |
| Year of manufacture: | 1971 |
| Total airframe hrs: | 5015 hours |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | West 1500 Street South, Woods Cross, Utah -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | BTF |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot of the helicopter was to perform an autorotation during a maintenance flight to perform a functional check of the free-wheeling unit. A witness observed the helicopter at 100 to 150 feet agl, and he said that the main rotor blades 'stopped' and the aircraft started a slow spiral to the left, nose down. He further said that the helicopter was shaking violently, and its skids were flexing in and out. Postcrash examination revealed that the fuel control pointer, on the fuel control, was slightly above flight idle. Both cockpit throttles were observed positioned in slightly above the flight idle position. The helicopter's power analyzer and recorder (PAR) documented that at the time of impact, the engine's torque (TRQ) was at 13.5% and the main rotor speed (NR) was at 65.8%. The procedure for a power recovery from an autorotation is to smoothly roll throttle back on, confirm rotor and N2 needles are joined and in normal operating range, and simultaneously pull up collective while applying left pedal.
Probable Cause: The pilot's failure to roll throttle back on (return the power to the normal operating range) during an attempted power recovery from an autorotation, and his subsequent failure to maintain aircraft control.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X20478&key=1
FAA register: 2. http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=7UT
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 14-Apr-2015 15:11 | Dr. John Smith | Updated [Time, Cn, Location, Nature, Departure airport, Source, Narrative] |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 12-Dec-2017 18:24 | ASN Update Bot | Updated [Aircraft type, Cn, Nature, Departure airport, Source, Narrative] |
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