NTSB Identification: CHI90DEC04.
The docket is stored on NTSB microfiche number 43185.
Accident occurred Tuesday, August 14, 1990 in STOCKBRIDGE, MI
Probable Cause Approval Date: 12/08/1992
Aircraft: BELL 47 D-1, registration: N3656F
Injuries: 1 Serious.

THE AGRICULTURAL HEILCOPTER HAD JUST TAKEN OFF ON AN EARLY MORNING RE-POSITIONING FLIGHT WHEN THE CANOPY BECAME COMPLETELY FOGGED OVER. BEFORE THE PILOT COULD RE-ORIENT HIMSELF BY LOOKING OUT THE SIDE OPENING, THE HELICOPTER COLLIDED WITH A POWER POLE AND WIRES. THE COLLISION CAUSED THE FUEL TANK TO RUPTURE AND SPRAYED AVIATION FUEL ONTO THE HOT ENGINE AND EXHAUST PIPES. THE ENSUING FIRE DESTROYED THE HELICOPTER.

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

THE RESTRICTED VISUAL LOOKOUT WHICH RESULTED FROM THE CANOPY FOGGING UP.

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