NTSB Identification: SEA86LA235.
The docket is stored on NTSB microfiche number 31662.
Accident occurred Saturday, August 30, 1986 in STIBNITE, ID
Aircraft: CESSNA 182D, registration: N8778X
Injuries: 2 Fatal,3 Serious.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
AFTER TAKING OFF IN MOUNTAINOUS TERRAIN, THE PILOT PREMATURELY TURNED ON COURSE TO A NORTHERLY HEADING, INTENDING TO CROSS OVER A RIDGE LINE. SHORTLY AFTER THE TURN, AND WHILE FLYING UP A DRAINAGE AREA TOWARDS RISING TERRAIN, HE ENCOUNTERED A DOWNDRAFT CONDITION WHICH REDUCED THE AIRCRAFT'S CLIMB PERFORMANCE. ITS CLIMB PERFORMANCE HAD ALREADY BEEN AGGRAVATED BY HIGHER THAN USUAL DENSITY ALTITUDE CONDITIONS. SUBSEQUENTLY, THE AIRCRAFT COLLIDED WITH TREES WHILE THE PILOT WAS ATTEMPTING TO REVERSE COURSE.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:PLANNING/DECISION..IMPROPER..PILOT IN COMMAND
WEATHER CONDITION..UNFAVORABLE WIND
WEATHER CONDITION..HIGH DENSITY ALTITUDE
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