ASN Wikibase Occurrence # 355820
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| Date: | Tuesday 27 May 1997 |
| Time: | 11:10 LT |
| Type: |  Bell 206L3 |
| Owner/operator: | Jeflyn Aviation Inc. |
| Registration: | N35CH |
| MSN: | 51335 |
| Year of manufacture: | 1990 |
| Total airframe hrs: | 3202 hours |
| Engine model: | Allison 250-C30P |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Boise, ID -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | , ID (KBOI) |
| (KBOI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was executing an autorotation maneuver for a FAR Part 135 flight check. This autorotation maneuver was to be a 180-degree reversal autorotation to a predetermined spot landing with a power termination. The pilot executed the maneuver, but during the level-off received a low RPM warning horn, and attempted to recover using power. During the attempt to increase power the helicopter's throttle interfered with a nut which had been installed for an external torque meter approximately one week before the accident. The nut on the torque meter installation interfered with the throttle controls in certain positions only. A discrepancy with the helicopter's throttle was noticed by the pilot-in-command, and reported to the FAA examiner before the beginning of the flight check.
Probable Cause: the improper torque meter installation by maintenance personnel, attempting flight with known discrepancies by the pilot-in-command and the check airman, and an improper autorotation by the pilot-in-command with improper oversight of the autorotation maneuver by the check airman.
Accident investigation:
 |
|
Sources:
NTSB CHI97FA149
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 15:58 | ASN Update Bot | Added |
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