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NTSB Report
October 25, 1992 · Piper PA-12 · N3743M
Lowman, ID
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 25, 1992
Injury Outcomes
2 injuries (2 fatalities)
Location
Lowman, ID
Aircraft
Piper PA-12
Tail Number
N3743M
Operator
Harpham Samuel E
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
SEA93FA010
THE PILOT OF THE PIPER PA-12 SPENT ABOUT 45 MINUTES MANEUVERING AT LOW LEVEL IN AND AROUND STEEP CANYONS IN THE ROUGH MOUNTAINOUS TERRAIN. HE THEN LANDED AT THE REMOTE FOREST SERVICE AIRSTRIP, AND SPENT ABOUT AN HOUR ON THE GROUND. AFTER DEPARTURE FROM THE AIRSTRIP, THE AIRCRAFT WAS OBSERVED FLYING LESS THAN 50 FEET ABOVE TREETOP LEVEL ALONG AN UNEVEN FORESTED RIDGE. WITNESSES INDICATED THAT, ALTHOUGH THEY LOST SIGHT OF THE AIRCRAFT BEHIND SOME TREES ABOUT FIVE SECONDS PRIOR TO THE ACCIDENT, THE ENGINE SOUNDED AS IF IT WAS RUNNING SMOOTHLY, AND AT OR NEAR FULL POWER, UNTIL THEY HEARD THE NOISE FROM THE IMPACT.
NTSB Probable Cause
THE PILOT'S FAILURE TO MAINTAIN ADEQUATE TERRAIN CLEARANCE. FACTORS INCLUDE MOUNTAINOUS/HILLY TERRAIN, TREES, AND THE PILOT'S DIVERTED ATTENTION.
Full Narrative
THE PILOT OF THE PIPER PA-12 SPENT ABOUT 45 MINUTES MANEUVERING AT LOW LEVEL IN AND AROUND STEEP CANYONS IN THE ROUGH MOUNTAINOUS TERRAIN. HE THEN LANDED AT THE REMOTE FOREST SERVICE AIRSTRIP, AND SPENT ABOUT AN HOUR ON THE GROUND. AFTER DEPARTURE FROM THE AIRSTRIP, THE AIRCRAFT WAS OBSERVED FLYING LESS THAN 50 FEET ABOVE TREETOP LEVEL ALONG AN UNEVEN FORESTED RIDGE. WITNESSES INDICATED THAT, ALTHOUGH THEY LOST SIGHT OF THE AIRCRAFT BEHIND SOME TREES ABOUT FIVE SECONDS PRIOR TO THE ACCIDENT, THE ENGINE SOUNDED AS IF IT WAS RUNNING SMOOTHLY, AND AT OR NEAR FULL POWER, UNTIL THEY HEARD THE NOISE FROM THE IMPACT.
Flight
Event TypeAccident
Event Time10:50 MST
Nearest Airport1nm E
Runway0
Flight Plan FiledNone
Aircraft FireGrd
Aircraft ExplosionGrd
Aircraft
AircraftPiper PA-12
Tail NumberN3743M
Aircraft CategoryAir
DamageDestroyed
OperatorHarpham Samuel E
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-A3B · Reciprocating · 150
Seats2
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 30 · First Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility20 sm
CeilingNone
Temperature / Dew Point64 F / 0 C
Altimeter0
Weather SourceWIT