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NTSB Report
August 14, 1984 · Piper PA-18A · N1561P
Mckinley, AK
Overview
Report Status
Preliminary report
Event Type
Accident
Date
August 14, 1984
Injury Outcomes
No injuries (2 uninjured)
Location
Mckinley, AK
Aircraft
Piper PA-18A
Tail Number
N1561P
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC84FA137
THE ACFT CRASHED WHILE ATTEMPTNG A TAKEOFF FROM A GRAVEL BAR. THE PLT ESTIMATED THE USEABLE AREA FOR TAKEOFF AS 400 TO 500 FT. INVESTIGATION REVEALED THAT THE DENSITY ALTITUDE WAS AT LEAST 3400 FT MSL. A TEST ENG RUN AFTER THE ACFT WAS RECOVERED, DETERMINED THAT THE CARBURETOR HEAT 'BUTTERFLY' VALVE FUNCTIONED NORMALLY IN THE 'ON' POSITION BUT WHEN PLACED IN THE 'OFF' POSITION WOULD ONLY OPEN PARTIALLY. THIS PREVENTED THE ENG FROM DELIVERYING FULL STATIC POWER DURING THE TEST.
Full Narrative
THE ACFT CRASHED WHILE ATTEMPTNG A TAKEOFF FROM A GRAVEL BAR. THE PLT ESTIMATED THE USEABLE AREA FOR TAKEOFF AS 400 TO 500 FT. INVESTIGATION REVEALED THAT THE DENSITY ALTITUDE WAS AT LEAST 3400 FT MSL. A TEST ENG RUN AFTER THE ACFT WAS RECOVERED, DETERMINED THAT THE CARBURETOR HEAT 'BUTTERFLY' VALVE FUNCTIONED NORMALLY IN THE 'ON' POSITION BUT WHEN PLACED IN THE 'OFF' POSITION WOULD ONLY OPEN PARTIALLY. THIS PREVENTED THE ENG FROM DELIVERYING FULL STATIC POWER DURING THE TEST.
Flight
Event TypeAccident
Event Time11:00 AKDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftPiper PA-18A
Tail NumberN1561P
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-A2B · Reciprocating · 150
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 36 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility20 sm
CeilingNone
Temperature / Dew Point61 F / 0 C
Altimeter0
Observation Time11:00
Weather SourcePILO