SEA85FA162

NTSB accident investigation · Beech B36TC · Idaho City, ID · July 12, 1985

Accident · FatalField investigationFinal report
Date
July 12, 1985, 10:27 local (16:27 UTC)
Place
Idaho City, ID
Injuries
2 fatal
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N948STBeech B36TC
Weather
Day
Status
Completed
Report
Approved by Office Director
FAA report
19850712030889A
Case key
40053

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight encounter with weatherCruise - normal
Preflight briefing service - not usedPilot in commandFactor
Weather evaluation - misjudgedPilot in commandCause
Loss of control - in flightClimb - to cruise
Weather condition - turbulence in cloudsCause
In flight collision with terrain/waterDescent - uncontrolled
Spiral - uncontrolledPilot in commandCause
Became lost/disorientedPilot in commandFactor
PanicPilot in commandFactor

Analysis

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.

Aircraft

Registration
N948ST
Reported as
Beech B36TC
Category
Airplane
Serial number
EA279
Engine
Continental TSIO-520-UB, 300 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Personal · Part 91
Operator
Michael E. Quesnoy
Registered owner
Visalia Electric Motor Shop
Airworthiness certificate
Standard, Normal
Last inspection
Annual · October 16, 1984
Departed
SMN · Salmon, ID
Destination
VIS · Visalia, CA
Flight plan
IFR

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
41
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
350 total · 2 in the last 24 hours

Weather

Conditions
Day
Wind
20° at 7 knots
Visibility
10 statute miles
Lowest ceiling
14,000 ft broken
Temperature
75 °F, dew point 55 °F
Altimeter
30.00 inHg
Observed at
BOI, 30 nm away

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.