NTSB Identification: BFO94LA100.
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Accident occurred Wednesday, June 15, 1994 in RAYNHAM, MA
Probable Cause Approval Date: 04/05/1995
Aircraft: ROBINSON R-22, registration: N8029Z
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.

WHILE IN CRUISE FLIGHT AT 500 FEET ABOVE THE GROUND, THE ENGINE HAD A PARTIAL LOSS OF POWER. THE PILOT STATED THAT HE NOTICED A RAPID RISE IN THE OIL TEMPERATURE, CYLINDER HEAD TEMPERATURE, AND MANIFOLD PRESSURE. HE STATED THE RPM'S BEGAN TO DECREASE SO HE INITIATED AN EMERGENCY DESCENT TO LAND. HE STATED ABOUT 100 FEET ABOVE THE GROUND, TOTAL POWER LOSS OCCURRED AND HE DID AN AUTOROTATION LANDING. THE PILOT STATED THAT DUE TO IRREGULAR TERRAIN AT THE LANDING SITE, THE MAIN ROTOR BLADES FLEXED DOWN AND CONTACTED THE TAIL BOOM. THE EXAMINATION OF THE ENGINE REVEALED THAT THERE WERE METAL SHAVINGS THROUGHOUT THE ENGINE AND THE NUMBER FOUR PISTON RINGS WERE BROKEN.

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

Failure of the number four cylinder piston rings.

Full narrative available

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