ASN Wikibase Occurrence # 138817
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| Date: | Tuesday 27 September 2011 |
| Time: | 10:30 |
| Type: |  Bell 47D-1 |
| Owner/operator: | Private |
| Registration: | N9158R |
| MSN: | 455 |
| Year of manufacture: | 1960 |
| Total airframe hrs: | 4831 hours |
| Engine model: | Franklin 6V4-178-B32 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Road 601 and Songbird Lane, north of Ahwahnee, CA -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Ahwahnee, CA |
| Ahwahnee, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot and mechanic were on a local area flight to warm the oil before changing the oil lines. As they returned, the pilot slowed the helicopter and initiated a gradual descent to the landing site. The main rotor rpm decreased. As they continued the descent, the clearance from the trees surrounding the landing area was minimal. The pilot attempted to avoid the trees as he tried to regain main rotor rpm. The helicopter impacted a tree and descended nose down into the terrain. According to the mechanic and pilot, they encountered no mechanical anomalies during the flight.
Probable Cause: The pilot’s failure to maintain adequate main rotor rpm during the landing approach, which resulted in a loss of control.
Accident investigation:
 |
|
Sources:
NTSB
History of this aircraft
Other occurrences involving this aircraft
| 20 May 1984 | N9158R | E.L. Decker | 0 | Alpena, MI | |
w/o |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Sep-2011 01:34 | RobertMB | Added |
| 28-Sep-2011 01:37 | RobertMB | Updated [Operator] |
| 30-Sep-2011 12:20 | Anon. | Updated [Operator] |
| 30-Sep-2011 13:37 | RobertMB | Updated [Operator] |
| 26-Oct-2011 02:03 | Dr. John Smith | Updated [Aircraft type, Phase, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 17:14 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Source, Narrative] |
Corrections or additions? ... Edit this accident description
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