NTSB Identification: LAX91LA182.
The docket is stored on NTSB microfiche number 45278.
Accident occurred Saturday, April 20, 1991 in PHOENIX, AZ
Probable Cause Approval Date: 05/27/1993
Aircraft: ROBINSON R22-BETA, registration: N4066J
Injuries: 1 Serious,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.

THE INSTRUCTOR PILOT ENTERED AN AUTOROTATION WHILE IN CRUISE FLIGHT AT AN ALTITUDE OF 500 FEET ABOVE THE GROUND AND AT AN AIRSPEED OF 60 KNOTS. THE MAIN ROTOR TACHOMETER DECREASED BELOW ITS MINIMAL RANGE FOR FLIGHT WHEN THE HELICOPTER ENTERED THE AUTOROTATION. THE INSTRUCTOR PILOT CONTINUED THE AUTOROTATIVE DESCENT UNTIL PASSING 150 FEET ABOVE GROUND LEVEL BEFORE INITIATING A POWER RECOVERY. THE MAIN ROTOR RPM DID NOT INCREASE AND THE AIRCRAFT COLLIDED WITH GROUND.

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

THE PILOT'S FAILURE TO MAINTAIN MAIN ROTOR RPM. FACTOR CONTRIBUTING TO THE ACCIDENT WAS THE PILOT'S INADEQUATE IN-FLIGHT PLANNING.

Index for Apr1991 | Index of months