NTSB Identification: ANC89LA118.
The docket is stored on NTSB microfiche number 39296.
Accident occurred Friday, July 07, 1989 in EUREKA, AK
Probable Cause Approval Date: 06/28/1991
Aircraft: PIPER PA-20, registration: N7029K
Injuries: 1 Serious,1 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PILOT WAS USING AUTOMOTIVE FUEL IN HIS AIRPLANE & HAD MADE NUMEROUS TAKEOFFS & LANDINGS IN RAPID SUCCESSION. THE TEMPERATURE WAS 50 DEGREES, THE SKY WAS CLEAR & THE AIRSTRIP ELEVATION WAS ABOUT 4000 FT. JUST AFTER LIFT-OFF, THE ENGINE COUGHED ONCE, THEN STOPPED COMPLETELY AS IF SOMEONE HAD TURNED IT OFF. SUBSQUENTLY THE AIRPLANE WAS DAMAGED DURING A LANDING ON UNEVEN TUNDRA. NO MECHANICAL IRREGULARITTIES WERE FOUND WITH THE ENGINE OR AIRPLANE. THE CARBURETOR COMPOSITE FLOAT WAS WEIGHTED & FOUND TO BE WITHIN SPECIFIED LIMITS, BUT WHEN SECTIONED, IT GAVE OFF A SLIGHT HYDROCARBONODOR. VAPOR PRESSURE OF THE AUTO FUEL WAS RPRTD TO BE 15 PSI AS COMPARED TO 5 PSI FOR 100 OCTANE AVIATION FUEL (AUTO FUEL MORE SUSCEPTIBLE TO VAPOR LOCK).

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LOSS OF ENGINE POWER FOR AN UNKNOWN REASON. A FACTOR RELATED TO THE ACCIDENT WAS: ROUGH TERRAIN IN THE EMERGENCY LANDING AREA.

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