ASN Wikibase Occurrence # 291737
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| Date: | Sunday 8 October 2006 |
| Time: | 12:12 LT |
| Type: |  Robinson R22 Beta |
| Owner/operator: | Silver State Helicopters, LLC |
| Registration: | N821SH |
| MSN: | 3774 |
| Year of manufacture: | 2004 |
| Total airframe hrs: | 1809 hours |
| Engine model: | Lycoming O-360-J2A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Upland, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Upland-Cable Airport, CA (CCB/KCCB) |
| La Verne-Brackett Field, CA (POC/KPOC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter's engine suddenly lost power during initial climb on an instructional flight. The certified flight instructor (CFI) took the controls and autorotated to a hard touchdown in a gravel pit. After securing the helicopter, the CFI inspected the throttle linkage. He reported that something appeared disconnected behind the firewall. "When rotating the throttle from full open to full close, the push/pull tube that connects to the carburetor does not move." The subsequent examination of the helicopter's throttle spring assembly revealed that on a previous occasion improper maintenance had been performed. The helicopter's maintenance records did not reflect maintenance in this area. The inspection revealed that the upper rod end bearing was disconnected from the lower portion of the rod because it had not been safety wired as required. This maintenance error resulted in a total loss of throttle control.
Probable Cause: Disconnection of the throttle control linkage due to improper maintenance, which resulted in a loss of engine power during initial climb.
Accident investigation:
 |
|
Sources:
NTSB LAX07LA005
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Oct-2022 18:20 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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