NTSB Identification: BFO86LA007.
The docket is stored on NTSB microfiche number 29871.
Accident occurred Friday, November 29, 1985 in MANASSAS, VA
Aircraft: ROBINSON R-22, registration: N8499B
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.

A SIMULATED STRAIGHT IN AUTOROTATION TO RUNWAY 34L WAS ENTERED FROM FINAL APPROACH BY LOWERING THE COLLECTIVE, AND A PWRRECOVERY WAS PLANNED AT THE BOTTOM OF THE AUTOROTATION. AT ABOUT 150 FEET AGL, THE THROTTLE WAS ROLLED IN TO MATCH THE ENGINE AND ROTOR NEEDLES, BUT THE ENGINE DID NOT RESPOND. THE AUTOROTATION WAS CONTINUED TO THE GROUND, AND THE HELICOPTER IMPACTED THE TERRAIN ABOUT 100 FEET FROM THE RWY 34L THRESHOLD, BOUNCED A FEW FEET IN THE AIR, ROTATED APPROXIMATELY 80-90 DEGREES TO THE LEFT, AND STRUCK THE GROUND AGAIN, COMING TO REST WITH AN APPROXIMATE 240 DEGREE HEADING.THE TAIL BOOM WAS SEVERED AND THE SKIDS WERE SPREAD.

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

AUTOROTATION..SIMULATED..PILOT IN COMMAND

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

REASON FOR OCCURRENCE UNDETERMINED

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

AUTOROTATION..PERFORMED..PILOT IN COMMAND


Contributing Factors

MISC ROTORCRAFT,TAIL BOOM..SEPARATION


Contributing Factors

TERRAIN CONDITION..GROUND

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