ASN Wikibase Occurrence # 21723
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| Date: | Tuesday 24 June 2008 |
| Time: | 13:45 |
| Type: |  Schweizer 269C (300C) |
| Owner/operator: | Northern Skies Aviation Inc |
| Registration: | N432MS |
| MSN: | S1437 |
| Year of manufacture: | 1990 |
| Total airframe hrs: | 3293 hours |
| Engine model: | Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 22 miles east of Buffalo, WY -
 United States of America
|
| Phase: | Take off |
| Nature: | Ferry/positioning |
| Departure airport: | Buffalo, WY |
| Buffalo, WY | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter pilot was picking up a biologist who was conducting land surveys. Prior to landing he circled the landing zone to observe the wind conditions. During the landing approach he transitioned out of effective translational lift earlier than expected, and attributed this to a reduced headwind caused by the enclosed terrain. During departure and acceleration to effective translational lift speed, the rotor speed began to decay. The ground speed was faster than he anticipated so he lowered the collective, and added forward cyclic, but could not maintain enough rotor speed for sustained flight. The pilot elected to land the helicopter ahead on a 30-degree uphill slope. After landing, the helicopter rolled back and the tail rotor made contact with the ground causing substantial damage to the tail rotor drive system. After the accident the pilot noted that the winds had shifted 180 degrees from his initial pre-accident observation.
Probable Cause: The pilot's attempted downwind takeoff that resulted in an aborted takeoff. Contributing to the accident was the unsuitable terrain.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Jul-2008 12:41 | Fusko | Added |
| 21-Dec-2016 19:14 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:16 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:20 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 03-Dec-2017 11:20 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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