ASN Wikibase Occurrence # 385576
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| Date: | Saturday 21 July 2001 |
| Time: | 11:55 LT |
| Type: |  Hughes 269C |
| Owner/operator: | Advanced Aviation |
| Registration: | N5015V |
| MSN: | 611058 |
| Total airframe hrs: | 6827 hours |
| Engine model: | Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Tracy, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Stockton Airport, CA (SCK/KSCK) |
| Tracy, CA (1Q4) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor stated that he was demonstrating an autorotation to his student when the accident occurred. He said that he initiated a straight in autorotation to runway 30 at 600 feet above ground level (agl). The descent rate was stabilized until 200 feet agl, when he felt a sudden increase in the rate of descent. He began the flare at 50 feet agl. He stated that the vertical speed did not decrease at the rate he was accustomed to, resulting in a hard landing. He stated that the tail boom hit the ground first in a right yawing moment. The helicopter then rolled to the right, crushing the right skid, severing the tail boom, and allowing the rotor blades to contact the ground. He noted that no mechanical problems existed with the helicopter during the flight. He did not notice any mechanical anomalies during the autorotation demonstration. He stated that the engine was running normally during the autorotation and the landing flare. The pilot stated that wind shear may have been a factor. He had observed the winds to be from the northwest at 8 knots, and gusts to 12 knots with light turbulence.
Probable Cause: The pilot's misjudgement of the landing flare during an autorotation demonstration. Factors were shifting winds and an excessive descent rate.
Accident investigation:
 |
|
Sources:
NTSB LAX01LA255
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Apr-2024 05:39 | ASN Update Bot | Added |
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