ASN Wikibase Occurrence # 284850
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| Date: | Sunday 27 May 2007 |
| Time: | 09:45 LT |
| Type: |  McDonnell Douglas MD 500E (369E) |
| Owner/operator: | Air Finance Corp C/o The Flying M Hunt Club |
| Registration: | N526BH |
| MSN: | 0467E |
| Year of manufacture: | 1991 |
| Engine model: | Allison 250-C20 SER |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Yerington, Nevada -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Yerington, NV (KFMR) |
| Yerington, NV (KFMR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter landed hard while practicing a low altitude engine failure and autorotation. According to the CFI, the student had rolled off the throttle to flight idle in preparation for the maneuver. As the helicopter descended the CFI heard the engine spool down, but did not observe a split between the rotor and engine tachometer needles. He realized that the student had not completely bottomed out the collective, and he immediately took over the flight controls. He attempted to regain some of the decayed rotor rpm's by rolling the throttle to full flight rpm, lowering the collective, and raising the nose to build inertia in the blades; however, he realized that the engine did not have enough time to spool up. He then reduced the throttle to flight idle, leveled the skids, and used the pedals to control the yaw in preparation for the touchdown. The helicopter landed hard with forward speed, and came to rest upright. The CFI reported that the maneuver had been initiated at 100 feet agl, with a targeted recovery of 20 feet agl. The CFI said there were no mechanical anomalies noted with the helicopter.
Probable Cause: The failure of the student and instructor to maintain an adequate main rotor rpm, and the instructor's inadequate in-flight supervision while conducting a low-level simulated emergency procedure, which resulted in a hard landing.
Accident investigation:
 |
|
Sources:
NTSB LAX07CA177
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Oct-2022 09:40 | ASN Update Bot | Added |
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