NTSB Identification: NYC84LA055.
The docket is stored on NTSB microfiche number 22604.
Accident occurred Sunday, December 18, 1983 in DUMMERSTON, VT
Aircraft: BELL 47-G3B1, registration: N48316
Injuries: 1 Uninjured.

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 PLT INITIATED A PRACTICE AUTOROTATION FROM ABOUT 600 FT AGL. AIRSPEED WAS ABOUT 55 KTS WITH LOW M/R RPM DUE TO LOW GROSS WEIGHT. A MODERATE FLARE WAS INITIATED IN AN EFFORT TO INCREASE ROTOR RPM, REDUCING THE AIRSPEED TO 40 KTS. HOWEVER, THE APPLICATION OF COLLECTIVE FAILED TO ARREST THE DESCENT RATE & THE T/R STRUCK THE GROUND CAUSING THE HELICOPTER TO VIBRATE. WHEN THE T/R STRUCK, ABOUT 6 INCHES OF ONE TIP BROKE CAUSING MORE VIBRATION. THE PLT ATTEMPTED TOLAND THE HELICOPTER, BUT DRIVE TO THE T/R CEASED TO RESPOND, & THE HELICOPTER YAWED TO THE RIGHT. THE LEFT SKID STRUCK THE GROUND & COLLAPSED, & THE MAST ASSEMBLY WAS PROJECTED THROUGH THE CANOPY BUBBLE.

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

AIRSPEED..MISJUDGED..PILOT IN COMMAND

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

ALTITUDE..MISJUDGED..PILOT IN COMMAND



Contributing Factors

AUTOROTATION..SIMULATED..PILOT IN COMMAND

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