ASN Wikibase Occurrence # 291824
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| Date: | Saturday 9 September 2006 |
| Time: | 16:30 LT |
| Type: |  Schweizer 269C-1 |
| Owner/operator: | Group 3 Aviation |
| Registration: | N323CP |
| MSN: | 0181 |
| Year of manufacture: | 2004 |
| Total airframe hrs: | 1769 hours |
| Engine model: | Lycoming H/O-260-G1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Van Nuys, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Los Angeles-Van Nuys Airport, CA (VNY/KVNY) |
| Los Angeles-Van Nuys Airport, CA (VNY/KVNY) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The certified flight instructor (CFI) and pilot under instruction (PUI) were going to perform a practice autorotation onto the taxiway. The airspeed was 65 knots indicated airspeed (KIAS), the manifold pressure was 21-23 inches, and the altitude was about 500 feet above ground level (agl). Shortly after initiating the maneuver, the low voltage warning light illuminated. They scanned the operating gauges and tachometer, which indicated a loss of engine power. The CFI took control; the helicopter landed hard, and the tail boom separated. Post accident examination revealed that the engine would run rough at idle with full mixture applied. The engine produced 2,000 revolutions per minute (rpm) with the mixture leaned. Examination of the fuel servo revealed no anomaly other than the idle spring missing from the mixture link, and that the idle was out of adjustment. Initial flow test results were out of limits in the idle range, but satisfactory at maximum throttle. With proper adjustment of the idle link, test results were within specified limits in all ranges. The purpose of the idle mixture spring is to control the movement of the mixture adjustment. If this spring is not installed, the mixture setting can vibrate to higher or lower settings. Maintenance records indicated that maintenance personnel had recently made an adjustment to the idle setting.
Probable Cause: Inadequate maintenance adjustment and missing mixture spring, which resulted in a loss of engine power during approach.
Accident investigation:
 |
|
Sources:
NTSB LAX06LA290
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Oct-2022 19:24 | ASN Update Bot | Added |
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