ASN Wikibase Occurrence # 45743
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| Date: | Tuesday 25 September 2001 |
| Time: | 15:00 |
| Type: | Timber Choppers Kaman HH-43B/F |
| Owner/operator: | Precision Helicopters |
| Registration: | N55714 |
| MSN: | 154 |
| Year of manufacture: | 1963 |
| Total airframe hrs: | 11110 hours |
| Engine model: | Lycoming T-53-L-13B |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 12 mi N of Bonners Ferry, ID -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | External load operation |
| Departure airport: | Bonners Ferry, ID |
| Investigating agency: | NTSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
During CFR Part 133 aero-logging operations in mountainous terrain, a loaded long-line became caught in some trees and separated from the helicopter. After the ground crew told the pilot what had happened, he began a hover over the site of the line separation, apparently to survey the situation. While in the hover, the pilot allowed the aircraft to move a short distance back and to the side. This put it into a position where its main rotor blades came in contact with a coniferous tree. Although the ground crew transmitted a warning to the pilot to power up and out of the trees, the rotor blades began coming apart before the pilot was able to take corrective action. Soon thereafter the helicopter collided with other trees, and fell to the ground in a nose down position.
Probable Cause: The pilot's inadequate visual lookout which lead to his failure to maintain clearance from the nearby trees while in a high-hover. Factors include mountainous/hilly terrain, and tall trees in the area where the helicopter was hovering.
(Ex US Army 62-4528)
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20010928X02008&key=1
Air International February 2002, p79
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Oct-2008 00:45 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Dec-2017 12:54 | ASN Update Bot | Updated [Nature, Source, Narrative] |
| 31-Mar-2018 17:53 | TB | Updated [Aircraft type, Cn, Location, Nature, Source, Damage, Narrative] |
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