NTSB Identification: SEA88LA101.
The docket is stored on NTSB microfiche number 36016.
Accident occurred Monday, May 30, 1988 in LESTER STATE, WA
Probable Cause Approval Date: 02/28/1989
Aircraft: CESSNA 172M, registration: N20580
Injuries: 4 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.

THE PILOT INADVERTENTLY FLEW INTO A NARROW VALLEY WITH TREES ON BOTH SIDES AND STEEP RISING TERRAIN DURING CLIMB TO CRUISE. THE AIRCRAFT WAS NOT ABLE TO OUTCLIMB THE RISING TERRAIN, SO THE PILOT SLOWED THE AIRCRAFT TO 40 M.P.H. AND ATTEMPTED A SHALLOW CLIMBING TURN TO AVOID LARGE BOULDERS. THE AIRCRAFT STRUCK TREES DURING THE TURN. THE AIRCRAFT THEN DESCENDED TOWARDS THE GROUND. THE AIRCRAFT IMPACTED TREES AND CAME TO REST SEVERAL FEET ABOVE THE GROUND IN A NOSE LOW ATTITUDE.

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

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

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

CLEARANCE..NOT MAINTAINED..PILOT IN COMMAND

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

ALTITUDE..INADEQUATE..PILOT IN COMMAND



Contributing Factors

TERRAIN CONDITION..RISING


Contributing Factors

OBJECT..TREE(S)

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