ASN Wikibase Occurrence # 196788
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| Date: | Wednesday 19 July 2017 |
| Time: | 10:10 |
| Type: |  Enstrom F-28C |
| Owner/operator: | Private |
| Registration: | N5697B |
| MSN: | 505-2 |
| Total airframe hrs: | 3715 hours |
| Engine model: | Lycoming HIO-360-E1AO |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | San Bernardino County, Chino, CA -
 United States of America
|
| Phase: | Approach |
| Nature: | Training |
| Departure airport: | Ontario, CA (CNO) |
| Ontario, CA (CNO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The solo student pilot reported that he entered the downwind leg to set up for the helicopter’s first landing of the day. When abeam the touchdown location, he conducted the prelanding checks with no anomalies noted. Before turning onto the base leg, the pilot lowered the collective, reduced the throttle, and started to descend about 100 ft per minute. During the descent, he observed that the engine rpm was slightly above 2,900 rpm. He reduced the throttle, and the rpm reduced slightly; however, it again increased to 2,900 rpm, and the manifold pressure was about 10 inches of mercury. When the helicopter was about 400 ft above ground level, the pilot heard the engine sound increase, and he observed that the engine rpm had increased to between about 3,300 and 3,500 rpm. The helicopter was unable to reach the runway, so the pilot continued to descend it toward a pasture, and it landed hard in the dirt.
A postaccident airframe and engine examination and subsequent engine run revealed no preimpact anomalies that would have precluded normal operation. The observed damage to the main rotor blades was consistent with blade coning, a condition indicative of low main rotor rpm. It is likely that the student pilot mismanaged the main rotor rpm during the descent, which resulted in a low rotor rpm and a high descent rate during landing.
Probable Cause: The student pilot's mismanagement of the main rotor rpm, which resulted in low rotor rpm, a high descent rate, and a subsequent hard landing.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=5697B
Location
Media:
Small helicopter crashes in Chino cow pasture, no cow was injured, pilot too, USA https://t.co/8RQj1W8DWM pic.twitter.com/9eZyWASEat
— Planes Of Legend (@PlanesOfLegend) 21 juillet 2017
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Jul-2017 06:05 | FHolbert | Added |
| 20-Jul-2017 06:06 | harro | Updated [Aircraft type] |
| 20-Jul-2017 14:08 | Geno | Updated [Cn, Location, Source, Damage] |
| 20-Jul-2017 17:49 | Aerossurance | Updated [Time, Operator, Location] |
| 21-Jul-2017 20:01 | Iceman 29 | Updated [Departure airport, Destination airport, Source, Embed code] |
| 07-Feb-2018 13:48 | ASN Update Bot | Updated [Time, Operator, Departure airport, Destination airport, Source, Embed code, Narrative] |
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