ASN Wikibase Occurrence # 213043
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| Date: | Saturday 30 July 2016 |
| Time: | 15:05 |
| Type: |  Bell 47G-2 |
| Owner/operator: | Experimental Aircraft Association |
| Registration: | N975BH |
| MSN: | 2242 |
| Year of manufacture: | 1959 |
| Total airframe hrs: | 6866 hours |
| Engine model: | Lycoming VO-435 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Oshkosh, WI -
 United States of America
|
| Phase: | Approach |
| Nature: | Executive |
| Departure airport: | Oshkosh, WI (OSH) |
| Oshkosh, WI (OSH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airline transport pilot maneuvered the helicopter on the downwind leg of the airport traffic pattern and attempted to reduce power for landing; however, the engine power remained excessively high. The pilot attempted to further reduce the engine power by turning off one magneto and applying carburetor heat, but the power remained too high to safely descend. The pilot then entered a sideslip, which allowed the helicopter to descend to about 100 ft above the runway. He turned the engine power off and autorotated to the ground. The helicopter landed hard in a tail-low attitude. The main rotor struck the tail and the tail rotor assembly separated from the helicopter.
A postaccident examination found that the throttle linkage nut had loosened and separated from its fitting, causing the throttle to remain open. The helicopter's maintenance manual did not specify a torque value for the throttle linkage nut, and there were no maintenance procedures requiring the nut to be loosened or removed during overhaul. The pilot indicated that a complete overhaul of the helicopter was completed about 37 hours before the accident flight.
Probable Cause: The loosening and separation of the throttle linkage nut, which resulted in a loss of throttle control and subsequent hard landing after autorotation.
Accident investigation:
 |
|
Sources:
NTSB
History of this aircraft
Other occurrences involving this aircraft
| 12 April 1994 | N5827U | Arizona Apple Company, Inc. | 0 | Willcox, AZ | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Jul-2018 13:13 | ASN Update Bot | Added |
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