NTSB Identification: LAX85FA030.
The docket is stored on NTSB microfiche number 26098.
Accident occurred Sunday, October 21, 1984 in LEE VINING, CA
Aircraft: CESSNA 150M, registration: N704EQ
Injuries: 2 Serious.

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 ACFT CRASHED INTO A MOUNTAIN DURING A VFR X-COUNTRY. THE ACFT WAS APPROACHING THE MOUNTAIN RIDGE ON THE LEE SIDE ANDDID NOT CLEAR THE TOP OF THE RIDGE. THE PLT SAID THAT WHEN HE SAW THE ACFT WAS NOT GOING TO CLEAR THE RIDGE HE LOWERED 10 DEGREES OF FLAPS AND STARTED A LEFT TURN. THE LEFT WING HIT THE SIDE OF THE RIDGE AND THE NOSE OF THE ACFT HIT A LARGE ROCK. THE ACFT THEN CARTWHEELED AND CAME TO A STOP RIGHT SIDE UP. THE AVIATION WEATHER HANDBOOK STATES IN PART THAT THE DOWNDRAFT ON THE LEE SIDE OF A MOUNTAIN MAY DRIVE AN ACFT INTO THE MOUNTAINSIDE. IT RECOMMENDS A CLIMB WELL IN ADVANCE OF THE MOUNTAIN TO AN ALT IN EXCESS OF THE TERRAIN TO BE CLEARED.

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

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

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

PROCEDURES/DIRECTIVES..IMPROPER..PILOT IN COMMAND

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

PROPER ALTITUDE..NOT OBTAINED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

WEATHER CONDITION..DOWNDRAFT


Contributing Factors

LACK OF FAMILIARITY WITH GEOGRAPHIC AREA..PILOT IN COMMAND


Contributing Factors

LOWERING OF FLAPS..IMPROPER..PILOT IN COMMAND

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