NTSB Identification: LAX85FA048.
The docket is stored on NTSB microfiche number 27428.
Accident occurred Friday, November 23, 1984 in LAKE ISABELLA, CA
Aircraft: CESSNA 172M, registration: N9589V
Injuries: 2 Fatal,1 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.

ACFT DEPARTED ARPT IN MOUNTAIN VALLEY (ELEV 2,614) GENERALLY DIRECT TOWARD A SADDLE PASS (ELEV 6,500) ABOUT 1 MI NW & ON THE LEE SIDE OF THE VALLEY. TOPS OF THE MOUNTAINS AROUND THE VALLEY AVERAGE ABOUT 7,000 FT MSL. FLT ENCOUNTERED UPDRAFTS DURING CLIMB UNTIL REACHING 6,800 FT MSL NEAR THE PASS WHEN IT EXPERIENCED A STRONG DOWNDRAFT/WINDSHEAR. PLT STATED THAT ACFT WOULD NOT RESPOND TO EVEN FULL POWER APPLICATION & DESCENT COULD NOT BE ARRESTED PRIOR TO COLLIDING WITH TREES. NO WX BRIEFING WAS OBTAINED PRIOR TO FLT. STRONG WINDS ALOFT AT 6 & 9 THOUSAND FT WERE FORECAST, ALONG WITH DOWNDRAFTS, WINDSHEARS & MODERATE TURBULENCE IN MOUNTAIN AREAS.

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

AIRCRAFT PERFORMANCE,CLIMB CAPABILITY..EXCEEDED

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

ALTITUDE..NOT MAINTAINED..PILOT IN COMMAND

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

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


Contributing Factors

WEATHER CONDITION..DOWNDRAFT


Contributing Factors

WEATHER CONDITION..WINDSHEAR


Contributing Factors

OBJECT..TREE(S)


Contributing Factors

JUDGMENT..DISREGARDED..PILOT IN COMMAND

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