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NTSB Report
July 22, 1991 · Cessna 177RG · N1573H
Salmon, ID
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 22, 1991
Injury Outcomes
4 injuries (4 fatalities)
Location
Salmon, ID
Aircraft
Cessna 177RG
Tail Number
N1573H
Operator
Marshall J Grosboll
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
SEA91FA183
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.
NTSB Probable Cause
IMPROPER INFLIGHT PLANNING AND DECISION BY THE PILOT, AND HIS FAILURE TO MAINTAIN SUFFICIENT ALTITUDE AND CLEARANCE FROM MOUNTAINOUS/HILLY TERRAIN.
Full Narrative
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.
Flight
Event TypeAccident
Event Time12:30 MDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionGrd
Aircraft
AircraftCessna 177RG
Tail NumberN1573H
Aircraft CategoryAir
DamageDestroyed
OperatorMarshall J Grosboll
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-360-A1B6D · Reciprocating · 200
Seats4
People & Injuries
Injury Summary4 injuries (4 fatalities)
Fatal4
Serious0
Minor0
Uninjured0
Total4
Crew 1Age 43 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point46
Altimeter30.00 inHg
Observation Time20:08
Weather SourceWFAC