NTSB Identification: LAX87LA299.
The docket is stored on NTSB microfiche number 34673.
Accident occurred Saturday, August 08, 1987 in MAMMOTH LAKES, CA
Probable Cause Approval Date: 11/29/1988
Aircraft: BEECH C23, registration: N24651
Injuries: 2 Uninjured.

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

DURING A PLEASURE FLIGHT, JUST AFTER TAKE-OFF, THE ENGINE EXPERIENCED A PARTIAL LOSS OF POWER WHEN THE PLT POSITIONED THE CARB HEAT CONTROL TO FULL COLD. THE PLT STATED THAT IN ORDER TO OBTAIN FULL POWER, DURING THE RUNUP HE WOULD POSITION THE CARB HEAT TO ONE EIGHTH HOT. INSPECTION AND A FLOW TEST OF THE CARB REVEALED THAT THE CARB WOULD SUSTAIN ENGINE OPERATION. THERE WERE NO MECHANICAL FAILURES OR MALFUNCTIONS REPORTED. THE TEMPERATURE RECORDED AT MAMMOTH LAKES AIRPORT 13 MINUTES AFTER THE ACCIDENT WAS 82 DEGREES. THE DENSITY ALTITUDE WAS 10,300 FEET. THE DEW POINT WAS NOT RECORDED THEREFORE THE PROBABILITY OF CARBURETOR ICING COULD NOT BE DETERMINED.

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

PREFLIGHT PLANNING/PREPARATION..INADEQUATE..PILOT IN COMMAND

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

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..INTENTIONAL..PILOT IN COMMAND


Contributing Factors

OBJECT..FENCE


Contributing Factors

TERRAIN CONDITION..DITCH


Contributing Factors

WEATHER CONDITION..HIGH DENSITY ALTITUDE


Contributing Factors

LACK OF TOTAL EXPERIENCE IN TYPE OPERATION..PILOT IN COMMAND


Contributing Factors

LACK OF TOTAL EXPERIENCE IN TYPE OF AIRCRAFT..PILOT IN COMMAND

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