ASN Wikibase Occurrence # 152375
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| Date: | Tuesday 8 January 2013 |
| Time: | 12:25 |
| Type: |  Bell OH-58C |
| Owner/operator: | Blair Helicopter Service Inc |
| Registration: | N911PT |
| MSN: | 41217 |
| Year of manufacture: | 1971 |
| Total airframe hrs: | 5443 hours |
| Engine model: | Rolls Royce T63 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Highway 41 and Harlan Avenue, E of Riverdale, CA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Riverdale, CA |
| Riverdale, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was conducting agricultural spray operations when he experienced a flight control system anomaly that was described as a right rolling tendency. The pilot increased altitude in an effort to return to the operator’s base for repairs. The helicopter became progressively difficult to control, continuing to roll right and not fully responding to left cyclic control inputs, and the pilot maneuvered to a nearby company loader to land. However, the right rolling tendency continued and the helicopter subsequently collided with terrain.
Postaccident examination of the flight control assembly revealed that the gas producer throttle control cable, which is routed adjacent to the connecting linkage push-pull tubes, was entwined with the push-pull tubes. A section of the cable appeared to be pinched between the lower mixing lever unit and the tunnel partition wall. Multiple nylon loop cable clamps, used to secure the throttle cable to the vertical tunnel partition, were broken and separated; however, it was not possible to determine whether the observed damage was the result of the wreckage recovery efforts or a preexisting condition.
Probable Cause: A flight control malfunction while maneuvering for reasons that could not be determined because it was not possible to establish whether observed damage to the flight control assembly was the result of wreckage recovery efforts or a preexisting condition.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=911PT
Location
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Jan-2013 03:33 | ben-haverdee | Added |
| 09-Jan-2013 03:35 | harro | Updated [Source, Embed code] |
| 09-Jan-2013 04:04 | gerard57 | Updated [Aircraft type, Embed code] |
| 09-Jan-2013 07:47 | Geno | Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 14:06 | ASN Update Bot | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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