ASN Wikibase Occurrence # 196595
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| Date: | Saturday 8 July 2017 |
| Time: | 10:40 |
| Type: |  Robinson R44 Raven I |
| Owner/operator: | J R AVIATION INC |
| Registration: | N7224U |
| MSN: | 1442 |
| Year of manufacture: | 2004 |
| Total airframe hrs: | 2217 hours |
| Engine model: | Lycoming O-540-F1B5 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Ireland, Dubois County, NW of Jasper, IN -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Ireland, IN |
| Ireland, IN | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The commercial pilot was conducting an agricultural aerial application flight. The pilot reported that the helicopter made an uncommanded right yaw during a turn. The pilot stated that he applied full left pedal to counter the yaw and that the helicopter centered briefly, but then the right yaw started again, which continued as the helicopter descended and impacted the ground.
Because the helicopter was likely operating out of ground effect at a high power setting, the uncommanded right yaw was likely the result of a loss of tail rotor effectiveness (LTE). According to Federal Aviation Administration guidance, the procedures to recover from LTE are early detection followed by applying forward cyclic to regain airspeed, applying right (not left) pedal to maintain rotor rpm, and reducing collective to reduce the high power demand on the tail rotor. On the basis of the available information, the pilot lost control of the helicopter when he responded improperly to the LTE by adding left pedal rather than by applying forward cyclic and right pedal and reducing collective.
Probable Cause: The pilot's failure to apply the proper procedures to recover from a loss of tail rotor effectiveness, which resulted in a loss of control during an aerial application turn.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N7224U
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Jul-2017 20:41 | Geno | Added |
| 10-Jul-2017 11:55 | rotorspot | Updated [Aircraft type] |
| 22-Dec-2018 20:28 | ASN Update Bot | Updated [Time, Operator, Departure airport, Destination airport, Source, Narrative, Accident report, ] |
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