NTSB Identification: FTW91LA053.
The docket is stored on NTSB microfiche number 43082.
Accident occurred Thursday, March 28, 1991 in SPRING, TX
Probable Cause Approval Date: 03/31/1993
Aircraft: ROBINSON R-22B, registration: N8050B
Injuries: 1 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

DURING A PARTIAL LOSS OF ENGINE POWER DUE TO CARBURETOR ICE, THE PILOT FAILED TO APPLY CARBURETOR HEAT IN AN EFFORT TO REGAIN POWER. DURING THE FORCED LANDING TO A RESIDENTIAL AREA THE STUDENT PILOT DID NOT APPLY APPROPRIATE COLLECTIVE CUSHIONING PITCH RESULTING IN THE HELICOPTER LANDING HARD AS THE TAIL ROTOR AND MAIN ROTOR STRUCK A TREE. TEMPERATURE/DEW POINT WERE 78/67 DEGREES RESPECTIVELY.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

POWER LOSS DUE TO CARBURETOR ICE, THE PILOT'S FAILURE TO USE CARBURETOR HEAT, AND HIS FAILURE TO APPLY ADEQUATE CUSHIONING COLLECTIVE PITCH DURING THE FLARE SEGMENT OF THE AUTOROTATION. A FACTOR IN THE ACCIDENT WAS THE PILOT'S IMPROPER AUTOROTATION TECHNIQUE.

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