Pilot Debrief

ROBINSON HELICOPTER R44 near Ireland, IN — 2017-07-08

Final reportCEN17LA267
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Date
2017-07-08
Location
Ireland, IN, USA
Aircraft
ROBINSON HELICOPTER R44
Registration
N7224U
Category
Helicopter
Highest injury
Serious
Fatalities
0
Phase of flight
Maneuvering

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.

NTSB narrative

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.

Analysis

Primary failure mode
Loss of control
First missed decision gate
Pilot could have recognized and corrected for loss of tail rotor effectiveness sooner.

NTSB coding

Evidence available

  • 3 docket documents
View NTSB final reportView NTSB docket

Docket documents3

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