FTW86MA097

NTSB accident investigation · Mitsubishi MU-2B-35 · Bartlett, TX · June 3, 1986

Accident · FatalMajor investigationFinal report
Date
June 2, 1986, 21:42 local (Jun 3, 1986, 02:42 UTC)
Place
Bartlett, TX
Injuries
1 fatal
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N8CCMitsubishi MU-2B-35
Weather
Visual (VMC) · Night/dark
Status
Completed
Report
Approved by Office Director
Safety recommendations
Yes
FAA report
19860602024669A
Case key
22168

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.

Loss of control - in flightCruise - normal
Light condition - dark nightFactor
Autopilot/flight director - undeterminedFactor
Emergency procedure - inadequatePilot in commandCause
Lack of familiarity with aircraftPilot in commandFactor
Descent - uncontrolled
In flight collision with terrain/waterDescent - uncontrolled

Analysis

About 6 min after takeoff, at 2138:31 CDT, the plt rprtd level at 9000 ft MSL. At 2140:17, he transmitted that he had trouble & said he could not control or disconnect the autopilot (a/p) which was causing the acft to descend. At 2141:14,he stated he was descending at 6000 ft/min. Another company plt in another acft asked if he could find the breaker, meaning the a/p circuit breaker. At 2141:27, the plt of N8CC replied, 'call you back.' Seconds later, radio & radar contact with N8CC were lost. A search was initiated, but the acft was not fnd until the following morning. An exam revealed the acft impacted in a steep, nose down, inverted attitude while at high speed; much of the wreckage was buried. No preimpact part failure/malfunction was fnd. With the a/p engaged, back pressure on the control column would have caused the a/p to trim nose down. Subsequently, the manufacturer issued a precautionary advisory to all MU-2 owner/operators regarding proper operation of the a/p and the various ways in which it can be disengaged.

Aircraft

Registration
N8CC
Reported as
Mitsubishi MU-2B-35
Category
Airplane
Serial number
569
Airframe hours
3,293
Engine
Airesearch TPE 331, 715 horsepower, turbo prop
Damage
Destroyed
Flight
Part 135
Operator
Martinaire, Inc.
Registered owner
Barron Thomas Aviation, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · May 3, 1986 · 42 hours before
Departed
AUS · Austin, TX
Destination
DFW · D/Fw Airport, TX
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
41
Certificates
Airline transport, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
5,268 total · 152 in this make and model · 5,018 as pilot in command · 116 in the last 90 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Night/dark
Wind
110° at 6 knots
Visibility
10 statute miles
Lowest ceiling
3,800 ft broken
Temperature
79 °F, dew point 75 °F
Altimeter
29.00 inHg
Observed at
AUS, 35 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.