NTSB Identification: NYC86LA013.
The docket is stored on NTSB microfiche number 29745.
Accident occurred Friday, October 18, 1985 in STERLING, MA
Aircraft: ROBINSON R22A, registration: N9069G
Injuries: 2 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 ACCIDENT OCCURRED WHEN THE CFI ALLOWED THE STUDENT WHO WAS IN A HOVER MANEUVER TO LOSE ROTOR RPM. THE HELICOPTER DRIFT REARWARD, THE LEFT REAR SKID DUG INTO THE GROUND AND THE HELICOPTER ROLLED OVER. RPM DECAYED SO BADLY THAT THE HELICOPTER COULD NOT RESPOND TO RECOVERY CONTROL INPUTS.

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

ROTORCRAFT FLIGHT CONTROLS..IMPROPER USE OF..DUAL STUDENT

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

REMEDIAL ACTION..DELAYED..PILOT IN COMMAND(CFI)

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

ROTOR RPM..NOT MAINTAINED..DUAL STUDENT

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

SUPERVISION..INADEQUATE..PILOT IN COMMAND(CFI)

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