NTSB Identification: CHI92DEX04
Accident occurred Friday, July 31, 1992 in DELPHI, IN
Probable Cause Approval Date: 07/26/1993
Aircraft: ALKIRE PIETENPOL, registration: N2739
Injuries: 1 Minor.

THE AIRPLANE WAS IN CRUISE FLIGHT WHEN PROPELLER SEPARATED. THE PILOT MADE A FORCED LANDING IN A SOFT FIELD WITH HIGH GRASS. THE LANDING GEAR SANK INTO THE GROUND DURING THE ROLLOUT, AND THE AIRPLANE NOSED OVER. THE INVESTIGATION REVEALED THAT FOUR OF SIX PROPELLER RETAINING BOLTS WERE CRACKED AND RUSTED ACROSS THEIR DIAMETER IN AMOUNTS VARYING FROM 30 TO 100%.

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

SEPARATION OF THE PROPELLER WHILE IN FLIGHT, AND UNSUITABLE TERRAIN TO EFFECT A FORCED LANDING.

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