NTSB Identification: SEA85FA162.
The docket is stored on NTSB microfiche number 28634.
Accident occurred Friday, July 12, 1985 in IDAHO CITY, ID
Aircraft: BEECH B36TC, registration: N948ST
Injuries: 2 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 PLT FAILED TO OBTAIN A PREFLT WX BRIEFING PRIOR TO DEPARTING BOTH BUTTE, MT, AND SALMON, ID. EN ROUTE AT FL180 HE ENTERED INSTRUMENT AND ICING CONDITIONS WHICH HE ATTEMPTED TO AVOID BY CLIMBING TO FL200. DURING THE CLIMB, THE PLT REPORTED ENCOUNTERING SEVERE TURBULENCE ASSOCIATED WITH DEVELOPING CUMULONIMBUS ACTIVITY. CONTROL OF THE ACFT WAS LOST AND THE ACFT DESCENDED TO GROUND IMPACT.

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

WEATHER CONDITION..TURBULENCE IN CLOUDS

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

SPIRAL..UNCONTROLLED..PILOT IN COMMAND

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

WEATHER EVALUATION..MISJUDGED..PILOT IN COMMAND


Contributing Factors

PREFLIGHT BRIEFING SERVICE..NOT USED..PILOT IN COMMAND


Contributing Factors

BECAME LOST/DISORIENTED..PILOT IN COMMAND


Contributing Factors

PANIC..PILOT IN COMMAND

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