NTSB Identification: SEA89LA007.
The docket is stored on NTSB microfiche number 37265.
Accident occurred Tuesday, October 04, 1988 in FIELDS, OR
Probable Cause Approval Date: 09/19/1989
Aircraft: AEROSPATIALE SA341G, registration: N401S
Injuries: 4 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.
THE PLT RPRTD THAT AS HE WAS IN A SLOW DESCENDING TURN TO THE LEFT AT ABOUT 20 KTS (TRANSLATIONAL LIFT). THE HELICOPTER SUDDENLY ROTATED TO THE LEFT WITHOUT WARNING. HE ESTIMATED THAT THIS OCCURRED AT ABOUT 30 FT AGL. HE APPLIED RIGHT PEDAL & THE ROTATION STOPPED IN A SLIGHT NOSE DOWN ATTITUDE AFTER ABOUT 2 TURNS. ALSO, THE PLT NOTICED THAT THE ENG WAS NOT PROVIDING POWER; HE PRESUMED THE FUEL LIMITER HAD RESTRICTED THE FLOW OF FUEL TO THE ENG, CAUSING A REDUCTION OF POWER. BEFORE TOUCHDOWN, THE PLT APPLIED COLLECTIVE TO CUSHION THE LANDING, BUT THE RIGHT SKID WAS DAMAGED & THE MAIN ROTOR BLADES FLEXED DOWNWARD & CONTACTED THE TAIL BOOM. THE DENSITY ALT WAS COMPUTED TO BE NEAR 6000 FT.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:ROTORCRAFT FLIGHT CONTROLS..IMPROPER USE OF..PILOT IN COMMAND
WEATHER CONDITION..HIGH DENSITY ALTITUDE
LACK OF TOTAL EXPERIENCE IN TYPE OF AIRCRAFT..PILOT IN COMMAND
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