LAX83FA124

NTSB accident investigation · Thorp T-18 · Simi, CA · March 5, 1983

Accident · FatalField investigationFinal report
Date
March 5, 1983, 12:00 local (20:00 UTC)
Place
Simi, CA
Injuries
1 fatal
Damage
Destroyed
Phase of flight
Unknown
Aircraft
N3124Thorp T-18
Weather
Visual (VMC) · Not reported
Status
Completed
Report
Approved by Office Director
FAA report
19830305006099A
Case key
23433

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

On this page

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.

Airframe/component/system failure/malfunctionUnknown
Flight control,stabilator attachment - failure,totalCause
Maintenance,annual inspection - inadequateOther maintenance personnelCause
Lack of total experience in kind of aircraftPilot in commandCause
Flight control,stabilator attachment - fatigueCause
In flight collision with terrain/waterDescent - uncontrolled

Analysis

The acft crashed in a school playground in a steep uncontrolled descent. Witnesses said the acft was observed in a 60 degree nose down attitude at about 1000 ft AGL and this continued until ground impact. The engine was producing high power at this time. No witnesses saw the acft before the dive. Examination revealed that the cockpit control stick had failed and the aileron and stabilator cross-bar right mounting post tube welded area failed prior to the accident. A pre-existing crack had existed for some time on the cross-bar tube when this tube failed the flt controls jammed which prevented the plt from controlling the acft.

Aircraft

Registration
N3124
Reported as
Thorp T-18
Category
Airplane, amateur-built
Serial number
MC-68
Airframe hours
506
Engine
Lycoming O-320B, 160 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Operator
Eric J. Shaw & Associates
Registered owner
Ted J. Mason
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · December 15, 1982 · 7 hours before
Departed
VNY · Van Nuys, CA

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
19
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Medical
Class 3, Valid Medical--no waivers/lim.
Seat
Left
Toxicology
Performed
Flight hours
195 total · 5 in this make and model · 118 as pilot in command · 18 in the last 90 days · 6 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Not reported
Wind
170° at 5 knots
Visibility
10 statute miles
Lowest ceiling
3,000 ft broken
Altimeter
30.00 inHg
Observed at
VYN, 13 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.