NTSB Identification: CHI83FA023
14 CFR Part 91: General Aviation
Accident occurred Thursday, October 21, 1982 in INDIAN HILL, OH
Probable Cause Approval Date: 10/21/1983
Aircraft: ROBINSON R-22, registration: N9015R
Injuries: 1 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE HELICOPTER WAS OBSERVED CIRCLING AN ATHLETIC FIELD. DURING THE THIRD PASS OVER THE FIELD IT WAS OBSERVED TO COME TO A NEAR HOVER IMMEDIATELY FOLLOWED BY A TAILROTOR SEPARATION. THE MANUFACTURER ISSUED A SAFETY NOTICE 12/4/81 & AGAIN ON 10/4/82 STRESSING THE IMPORTANCE OF MAINTAINING ROTOR RPM & AIRSPEED. ON 10/27/82 NTSB ISSUED SAFETY RECOMMENDATIONS A-82-143 & -144 TO SUSPEND THE AIRWORTHINESS CERTIFICATE OF THE R-22 UNTIL (1) MAIN ROTOR SYST STABILITY/STALL CHARACTERISTICS & M/R RPM DECAY RATES ARE DETERMINED TO PROVIDE ADEQUATE MARGINS OF SAFETY & TO BE COMPATIBLE WITH NORMAL PLT REACTION TIMES, & UNTIL THE M/R SYSTEM IS DETERMINED TO BE IN COMPLIANCE WITH 14CFR27.661. THE BOARD RECOMMENDED A STUDY BE CONDUCTED TO VERIFY THAT ADEQUATE ENG TORQUE IS AVAILABLE TO THE M/R SYSTEM TO RECOVER RPM SHOULDA RAPID DECAY OF RPM OCCUR DURING FLT. AN AD WAS ISSUED REQUIRING RAISING THE ACTUATION RPM SETTING FOR THE LOW RPM WARNING LIGHT & REQUIRING THAT A LOWROTOR RPM WARNING LIGHT BE INSTALLED ON A R-22'S.

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

COLLECTIVE..IMPROPER USE OF..PILOT IN COMMAND

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

ADEQUATE ROTOR RPM..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

ROTOR SYSTEM..INADEQUATE


Contributing Factors

ACFT/EQUIP,INADEQUATE HANDLING/PERF CAPABILITIES..MANUFACTURER


Contributing Factors

INADEQUATE TRANSITION/UPGRADE TRAINING..PILOT IN COMMAND


Contributing Factors

LACK OF TOTAL EXPERIENCE IN TYPE OF AIRCRAFT..PILOT IN COMMAND


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