ASN Wikibase Occurrence # 17502
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| Date: | Friday 11 April 2008 |
| Time: | 09:00 |
| Type: |  Bell 47G-3B1 |
| Owner/operator: | Helicopter Roundup Service, LLC |
| Registration: | N24SD |
| MSN: | 3671 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 9476 hours |
| Engine model: | Lycoming TVO-435-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 25 mi S of Denio, NV -
 United States of America
|
| Phase: | En route |
| Nature: | Survey |
| Departure airport: | Denio, NV |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After the passenger shot a coyote during the predator control flight, the helicopter pilot circled the injured coyote. While maneuvering at 15 miles per hour and about 20 feet above the hilly terrain, the pilot heard a grinding noise, which he opined originated from the transmission. The pilot believed the helicopter was losing power, and he opted to immediately land on sloping terrain. The helicopter touched down hard, the main rotors severed the tail boom, and the helicopter rolled over. During the subsequent examination of the airframe, transmission, and engine, no evidence of a mechanical malfunction was found. One of the two cooling fan drive belts was not found seated, and may have rolled over on its pulley, producing the noise that the pilot may have misinterpreted as relating to a loss of power.
Probable Cause: The pilot's inadvertent hard landing induced by a perceived loss of power and a main transmission anomaly while maneuvering at low altitude.
Accident investigation:
 |
|
Sources:
NTSB
History of this aircraft
Other occurrences involving this aircraft
| 13 September 2005 | N24SD | Helicopter Roundup Service LLC | 0 | Rock Springs, Wyoming | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Apr-2008 21:01 | Fusko | Added |
| 19-Oct-2011 07:50 | Dr. John Smith | Updated [Time, Departure airport, Destination airport, Source, Narrative] |
| 05-Jun-2014 19:14 | TB | Updated [Aircraft type, Location, Departure airport, Destination airport, Source, Damage, Narrative] |
| 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 10:44 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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