NTSB Identification: LAX88FA230.
The docket is stored on NTSB microfiche number 36056.
Accident occurred Thursday, June 23, 1988 in BIG BEAR LAKE, CA
Probable Cause Approval Date: 03/13/1989
Aircraft: CESSNA 310, registration: N170R
Injuries: 4 Fatal.
NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.
THE RECENTLY CERTIFICATED MULTIENGINE PILOT AND FRIENDS FLEW TO BIG BEAR AIRPORT FOR LUNCH. THE DENSITY ALTITUDE AT THE AIRPORT WAS ABOUT 8,000 FEET. THE PILOT ENTERED A SOUTH DOWNWIND LEG FOR RUNWAY 07 AT THE AIRPORT FOLLOWING A MOONEY 231. GROUND WITNESSES REPORTED THAT THE AIRPLANE WAS FLYING VERY SLOW WHEN IT WAS ON THE DOWNWIND LEG. WHEN THE AIRPLANE ENTERED THE BASE LEG. IT STALLED AND ENTERED INTO A SPIN. THE AIRPLANE CRASHED IN A NEAR VERTICAL DESCENT ATTITUDE. THE POST CRASH INVESTIGATION REVEALED THAT THE AIRPLANE'S LANDING GEARS AND FLAPS WERE EXTENDED; THE AMOUNT OF FLAP EXTENSION, HOWEVER, COULD NOT BE DETERMINED. THE INVESTIGATION DID NOT DISCLOSE ANY PREEXISTING MALFUNCTIONS OR FAILURES.
The National Transportation Safety Board determines the probable cause(s) of this accident to be:AIRSPEED..NOT MAINTAINED..PILOT IN COMMAND
WEATHER CONDITION..HIGH DENSITY ALTITUDE
STALL/SPIN..INADVERTENT..PILOT IN COMMAND
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