NTSB Identification: MIA92LA031.
The docket is stored on NTSB microfiche number 45634.
Accident occurred Sunday, November 17, 1991 in OCALA, FL
Probable Cause Approval Date: 04/27/1993
Aircraft: ROBINSON R22 MARINER, registration: N4072U
Injuries: 2 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.
PILOT INITIATED PRACTICE AUTOROTATION. AT 500 FEET ALTITUDE RECOVERY WAS ATTEMPTED BY INCREASING COLLECTIVE AND INCREASING THROTTLE. LOW ROTOR SPEED WARNING WAS HEARD AND ENGINE DID NOT ACCELERATE. PILOT LOWERED COLLECTIVE AND CONTINUED AUTOROTATION TO THE GROUND AT WHICH TIME A HARD LANDING WAS MADE. POSTCRASH EXAMINATION OF THE AIRCRAFT BY FAA INSPECTORS REVEALED NO EVIDENCE OF FAILURE OR MALFUNCTION OF THE AIRCRAFT ENGINE. THE ENGINE WAS OPERATED AFTER THE ACCIDENT WITH NO EVIDENCE OF FAILURE.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: THE PILOT-IN-COMMAND'S IMPROPER USE OF COLLECTIVE CONTROL AND THROTTLE DURING RECOVERY FROM AN AUTOROTATION WHICH RESULTED IN LOSS OF ROTOR RPM AND A SUBSEQUENT HARD LANDING.
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