ASN Wikibase Occurrence # 133538
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| Date: | Friday 25 July 1997 |
| Time: | 15:30 LT |
| Type: |  Robinson R22 BETA |
| Owner/operator: | Delta Leasing Inc. |
| Registration: | N4008D |
| MSN: | 1456 |
| Year of manufacture: | 1990 |
| Total airframe hrs: | 5400 hours |
| Engine model: | Lycoming O-320 B2C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Chandler Memorial Airport, Chandler, Maricopa County, Arizona -
 United States of America
|
| Phase: | En route |
| Nature: | Training |
| Departure airport: | , AZ (KCHD) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The CFI and private pilot were practicing maneuvers at the airport. The CFI stated that the helicopter was suddenly in a nose-low attitude with a high rate of descent. He said he tried to raise the collective to stop the descent rate with no apparent result. The student stated that he began a 30-degree banked turn to the left. He said the instructor felt the turn was 'too lazy' and he took control of the aircraft and proceeded to increase the bank angle to approximately 45 degrees. The aircraft then began to pitch nose down, the collective and cyclic began to shake and vibrate, which he said continued until impact. The student is a private pilot with both single engine land and rotorcraft helicopter ratings. He had approximately 76 hours of fixed wing time and 223 hours in rotorcraft.
Probable Cause: The CFI's failure to recognize and correct for a vortex ring state, and his improper use of the flight controls, which resulted in the loss of control and uncontrolled descent.
Accident investigation:
 |
|
Sources:
NTSB LAX97LA260
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=4008D
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Sep-2016 18:21 | Dr.John Smith | Updated [Time, Operator, Location, Phase, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 08-Apr-2024 13:59 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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