NTSB Identification: SEA91FA183.
The docket is stored on NTSB microfiche number 43935.
Accident occurred Monday, July 22, 1991 in SALMON, ID
Probable Cause Approval Date: 12/04/1992
Aircraft: CESSNA 177RG, registration: N1573H
Injuries: 4 Fatal.
NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.
THE PILOT DEPARTED SOUTHBOUND FROM THE SALMON, IDAHO AIRPORT AFTER A REFUELING STOP. A WITNESS SAW THE AIRCRAFT ENTER A CANYON SOUTH OF THE AIRPORT AT LOW ALTITUDE. SUBSEQUENTLY, IT COLLIDED WITH THE EAST SIDE OF THE CANYON AFTER TURNING BACK TOWARD A NORTHERLY DIRECTION. DURING INITIAL IMPACT, THE RIGHT WINGTIP & NOSE OF THE AIRCRAFT COLLIDED WITH A 30 TO 35 DEG RISING SLOPE. THERE WAS EVIDENCE THE AIRCRAFT WAS STILL ANGLED TOWARD RISING TERRAIN WHEN THE ACCIDENT OCCURRED. THE ACCIDENT OCCURRED AT AN ELEVATION OF ABOUT 5600 FT, ABOUT 11 MI SOUTH OF THE AIRPORT. LEADING EDGE GOUGES & CHORDWISE SCRATCHES WERE NOTED ON THE PROPELLER BLADES. THE THROTTLE, MIXTURE & PROPELLER CONTROLS WERE FOUND IN THE FULL FORWARD POSITION.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: IMPROPER INFLIGHT PLANNING AND DECISION BY THE PILOT, AND HIS FAILURE TO MAINTAIN SUFFICIENT ALTITUDE AND CLEARANCE FROM MOUNTAINOUS/HILLY TERRAIN.
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