NTSB Identification: SEA91LA109.
The docket is stored on NTSB microfiche number 43925.
Accident occurred Sunday, May 19, 1991 in MALOTT, WA
Probable Cause Approval Date: 05/27/1993
Aircraft: BELL 47G-3B-1, registration: N73903
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.

DURING AN AERIAL APPLICATION FLIGHT, THE ENGINE SUDDENLY LOST POWER. THE PILOT TRIED TO MANEUVER TO AN OPEN AREA, HOWEVER, THE HELICOPTER COLLIDED WITH TREES. POST CRASH INVESTIGATION REVEALED THAT THE HELICOPTER EXPERIENCED AN IN FLIGHT FIRE. IT WAS FOUND THAT A SECTION OF THE AUXILIARY FUEL PUMP CASING BROKE AWAY IN THE AREA WHERE THE FUEL LINE FITTING SCREWS INTO THE PUMP. DUE TO FIRE DAMAGE, USEFUL FACTURE TOPOGRAPHY TO DETERMINE THE MODE OF FAILURE WAS DESTROYED.

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

AN UNDETERMINED FAILURE OF THE FUEL PUMP CASING RESULTING IN AN IN FLIGHT FIRE AND LOSS OF ENGINE POWER.

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