LAX86FA140

NTSB accident investigation · Beech A36TC · Woodfords, CA · March 15, 1986

Accident · FatalField investigationFinal report
Date
March 15, 1986, 13:40 local (21:40 UTC)
Place
Woodfords, CA
Injuries
3 fatal
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N333AUBeech A36TC
Weather
Instrument (IMC) · Day
Status
Completed · report February 3, 1988
Report
Approved by Office Director
FAA report
19860315087199A
Case key
24905

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
Weather condition - icing conditionsFactor
Weather condition - snow
Weather condition - turbulenceFactor
Loss of control - in flightCruise - normal
Aircraft handling - improperPilot in commandCause
Directional control - not maintainedPilot in commandCause
Descent - uncontrolledPilot in commandCause
Airframe/component/system failure/malfunctionDescent - uncontrolled
Wing - overload
Design stress limits of aircraft - exceededPilot in command

Analysis

The wx deteriorated while the acft was cruising in IMC at 17,000 ft. moderate turbulence & icing conditions in the layered clouds were reported by other nearby flying acft. The plt informed ARTCC that he 'lost the autopilot,' & the acft's course began changing radically. A ground based witness described the approaching acft's noise as being similar to the 'screaming' produced by an acft in a power dive. The surface visibility was restricted by snow to between 200 ft - 1/4 mi. Control of the acft was lost and an inflight breakup occurred. The wreckage was found distributed over a 1/8 by 3/4 mile area. The primary airframe failure occurred on the left side of the wing spar carry through structure. The structure broke in an upward (positive) direction. No evidence for the reported loss of the autopilot or with the related flight control system was found. The acft was neither certificated not equipped for flight into icing conditions.

Aircraft

Registration
N333AU
Reported as
Beech A36TC
Category
Airplane
Serial number
EA-198
Engine
Continental TSIO-520-UB, 300 horsepower, reciprocating
Damage
Destroyed
Flight
Business · Part 91
Registered owner
Aurich, Inc.
Airworthiness certificate
Standard, Utility
Last inspection
Annual · October 21, 1985 · 21 hours before
Departed
BFI · Seattle, WA
Destination
OXR · Oxnard, CA
Flight plan
IFR

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
47
Certificate
Private
Airplane ratings
Single-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Seat
Left
Toxicology
Performed
Flight hours
2,310 total

Weather

Conditions
Instrument (IMC) · Day
Wind
180° at 10 knots
Lowest ceiling
800 ft
Temperature
28 °F, dew point 27 °F
Altimeter
29.00 inHg
Observed at
TVL, 9 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.