ASN Wikibase Occurrence # 385667
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| Date: | Monday 2 July 2001 |
| Time: | 14:26 LT |
| Type: |  Robinson R22 Beta |
| Owner/operator: | Sierra Academy Of Aeronautics, Inc. |
| Registration: | N4052K |
| MSN: | 1766 |
| Year of manufacture: | 1991 |
| Total airframe hrs: | 7982 hours |
| Engine model: | Textron Lycoming O-320-32C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hayward, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Oakland International Airport, CA (OAK/KOAK) |
| Hayward Executive Airport, CA (HWD/KHWD) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter impacted the ground, bounced, and impacted the ground a second time during a practice autorotation. The commercial/student pilot was practicing a 180-degree autorotation with a power recovery when an excessive rate of descent developed. The flight instructor said he "joined" the student on the controls and initiated a progressive rollout of the turn while simultaneously applying aft cyclic, raising the collective, and applying more power for a power recovery to level flight. The instructor said that the engine did not respond to the throttle input. Due to the rate of descent, the flight instructor elected not to attempt an "aggressive" flare "fearing a tail rotor ground strike." He continued with aft cyclic input and collective manipulation to reduce forward airspeed and rate of descent for a run-on landing. The helicopter contacted the ground in a "near skids level attitude" approximately 30 knots, with the rotor rpm in the "high end of the green region." The helicopter became airborne approximately 8-10 feet above the ground. The flight instructor indicated that the throttle was still unresponsive. He raised the collective to cushion the second impact and the low rotor rpm warning light and horn came on prior to set down. The helicopter impacted the ground again approximately 20 knots, collapsing the left skid. The helicopter then rolled to the left and came to rest on its left side facing approximately 180 degrees from the approach heading. A post-accident examination of the helicopter revealed no anomalies, with the exception of a failed left seat restraining system. An engine test run was conducted and no anomalies were noted that would have affected its operation.
Probable Cause: the student's excessive rate of descent during a practice autorotation, and, the inadequate use of the rotorcraft flight controls by both pilots during the attempted recovery, which resulted in a hard landing. The flight instructor's inadequate supervision during the maneuver was also causal.
Accident investigation:
 |
|
Sources:
NTSB LAX01LA232
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Apr-2024 06:38 | ASN Update Bot | Added |
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