NTSB Identification: SEA84LA010.
The docket is stored on NTSB microfiche number 21426.
Accident occurred Saturday, October 15, 1983 in MCCALL, ID
Aircraft: CESSNA 172, registration: N738RD
Injuries: 2 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

WHILE EN ROUTE, THE PLT ENTERED A DRAINAGE AREA IN MOUNTAINOUS TERRAIN WITH THE INTENT OF CROSSING A RIDGE AT THE LOWEST POINT. AS HE CONTINUED IN A CANYON, HE HAD A 500 FT/MIN CLIMB RATE & HE BELIEVED HE COULD EASILY CLEAR THE RIDGE.HOWEVER, AS HE CONTINUED, THE CLIMB RATE DECREASED & HE GOT IN A POSITION WHERE THERE WAS INSUFFICIENT ROOM TO TURN AROUND. SUBSEQUENTLY, THE ACFT STRUCK THE TOP OF A TREE & CRASHED NEAR THE RIDGE AT AN ELEVATION OF APRX 7900 FT. THE PLT BELIEVED HE HAD ENCOUNTERED DOWNDRAFTS. THE ACFT WAS ESTIMATED TO BE NEAR ITS MAX GROSS WEIGHT LIMIT. ITS NORMAL CLIMB RATE AT THAT WEIGHT & ALT COMPUTED TO BE APRX 330 FT/MIN. HOWEVER, THE CLIMB RATE WAS NEAR ZERO JUST PRIOR TO THE ACCIDENT.

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

TERRAIN CONDITION..RISING


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

WEATHER CONDITION..DOWNDRAFT


Contributing Factors

PROPER CLIMB RATE..NOT POSSIBLE..PILOT IN COMMAND


Contributing Factors

MANEUVER..NOT POSSIBLE..PILOT IN COMMAND


Contributing Factors

OBJECT..TREE(S)

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