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NTSB Report
September 7, 1989 · Piper PA-24-180 · N7835P
Grantsville, UT
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 7, 1989
Injury Outcomes
2 injuries (2 fatalities)
Location
Grantsville, UT
Aircraft
Piper PA-24-180
Tail Number
N7835P
Operator
Calvin Joe B
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
DEN89FA208
THE PLT & PASSENGER TOOK OFF ON A LOCAL FLT AT 1801 MDT. WHEN THE ACFT DID NOT RETURN, A SEARCH WAS INITIATED. THE ACFT WAS FOUND THE NEXT MORNING WHERE IT HAD CRASHED & BURNED ON THE SIDE OF A BOX CANYON. ENTRANCE TO THE CANYON WAS FROM THE SOUTHEAST. THE ACFT CRASHED ON STEEP TERRAIN ON THE WEST SIDE OF THE CANYON. IMPACT WAS ON A SOUTHERLY HEADING. IMPACT MARKS (FRAGMENTED & GOUGED ROCKS) WERE FOUND ABOUT 50 FT UPSLOPE FROM WHERE THE MAIN WRECKAGE CAME TO REST. MUCH OF THE WRECKAGE WAS DEMOLISHED BY FIRE. AN EXAM OF THE RGT WING REVEALED CHORDWISE CRUSHING OF ITS LOWER SKIN. BOTH PROP BLADES WERE BENT & TWISTED; THE TIPS OF BOTH PROPS WERE TORN OFF. NO PREIMPACT MECHANICAL PART FAILURE OR MALFUNCTION WAS FOUND. DENSITY ALTITUDE AT THE CRASH SITE WAS APRX 7000 FT.
NTSB Probable Cause
IMPROPER IN-FLIGHT PLANNING/DECISION BY THE PILOT, BY ENTERING A BOX CANYON WITH INSUFFICIENT ALTITUDE TO ASSURE A SAFE EXIT. CONTRIBUTING FACTORS WERE: BOX CANYON, RISING TERRAIN, AND HIGH DENSITY ALTITUDE.
Full Narrative
THE PLT & PASSENGER TOOK OFF ON A LOCAL FLT AT 1801 MDT. WHEN THE ACFT DID NOT RETURN, A SEARCH WAS INITIATED. THE ACFT WAS FOUND THE NEXT MORNING WHERE IT HAD CRASHED & BURNED ON THE SIDE OF A BOX CANYON. ENTRANCE TO THE CANYON WAS FROM THE SOUTHEAST. THE ACFT CRASHED ON STEEP TERRAIN ON THE WEST SIDE OF THE CANYON. IMPACT WAS ON A SOUTHERLY HEADING. IMPACT MARKS (FRAGMENTED & GOUGED ROCKS) WERE FOUND ABOUT 50 FT UPSLOPE FROM WHERE THE MAIN WRECKAGE CAME TO REST. MUCH OF THE WRECKAGE WAS DEMOLISHED BY FIRE. AN EXAM OF THE RGT WING REVEALED CHORDWISE CRUSHING OF ITS LOWER SKIN. BOTH PROP BLADES WERE BENT & TWISTED; THE TIPS OF BOTH PROPS WERE TORN OFF. NO PREIMPACT MECHANICAL PART FAILURE OR MALFUNCTION WAS FOUND. DENSITY ALTITUDE AT THE CRASH SITE WAS APRX 7000 FT.
Flight
Event TypeAccident
Event Time18:15 MDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledVFR
Aircraft FireGrd
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-24-180
Tail NumberN7835P
Aircraft CategoryAir
DamageDestroyed
OperatorCalvin Joe B
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-A1A · Reciprocating · 180
Seats4
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 30 · Second Class
Conditions
ConditionsVMC
LightDusk
Wind320° @ 11 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point39 C
Altimeter29.00 inHg
Observation Time23:54
Weather SourceWFAC