ASN Wikibase Occurrence # 134244
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| Date: | Saturday 16 June 2001 |
| Time: | 14:15 |
| Type: |  Hughes 369HS |
| Owner/operator: | Trinity Helicopters, Inc. |
| Registration: | N4467V |
| MSN: | 1206363S |
| Year of manufacture: | 1972 |
| Total airframe hrs: | 7635 hours |
| Engine model: | Allison 250-C20 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Mountain View, CA -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Mountain View, CA (NUQ) |
| Mountain View, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
During powerline maintenance work, the pilot lost control of the helicopter, resulting in the main rotor blades contacting a transmission line tower, and the helicopter fell to the ground. As he had on numerous occasions, the pilot flew to the tower to pickup a passenger who was performing maintenance on it. The pilot placed one of the helicopter's skids on the tower and the passenger began boarding. However, on this occasion a gust of wind was experienced and the wind direction suddenly shifted. Despite the pilot's effort to maintain control, the helicopter dynamically rolled over resulting in a main rotor blade striking the tower. Thereafter, the pilot lost total control and the helicopter fell about 90 feet to the ground. No mechanical malfunctions were reported.
Probable Cause: The pilot's failure to maintain control while hovering out of ground effect. A factor was the wind gusts.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20010625X01252&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Dec-2017 11:26 | ASN Update Bot | Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
| 12-Sep-2019 07:55 | BEAVERSPOTTER | Updated [Cn] |
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