SEA86FA165

NTSB accident investigation · Thorp T-18 · Richland, WA · July 11, 1986

Accident · FatalField investigationFinal report
Date
July 11, 1986, 14:50 local (21:50 UTC)
Place
Richland, WA
Injuries
2 fatal
Damage
Destroyed
Phase of flight
Approach
Aircraft
N2056Thorp T-18
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19860711032059A
Case key
40289

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 flightApproach - vfr pattern - base leg/base to final
Proper alignment - not attainedPilot in commandFactor
Remedial action - excessivePilot in commandCause
Airspeed - not maintainedPilot in commandCause
Stall/spin - inadvertentPilot in commandCause
Weather condition - crosswindFactor
In flight collision with terrain/waterDescent - uncontrolled

Analysis

At time of mishap, acft presumed to be in rt-hand approach to land in 20-KT, 40 degree rt crosswind. Witnesses first observed acft descending vertically, out of control, in an area consistent with the 90 degree approach position. Evidence indicates acft contacted soft, sandy terrain in vertical attitude, then fell over to upright flat attitude before intense post-impact fire incinerated most of airframe. No evidence found of mechanical failure/malfunction. Scenario indicative of steep turn to correct crosswind-induced close-in pattern.

Aircraft

Registration
N2056
Reported as
Thorp T-18
Category
Airplane, amateur-built
Serial number
474
Airframe hours
650
Engine
Lycoming O-290-GPO, 125 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Personal · Part 91
Operator
Donald A. Mccune
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · June 13, 1986 · 9 hours before
Departed
S21 · Sun River, OR
Destination
RLD · Richland, WA
Flight plan
VFR
Airport
RLD · Richland, Wa

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
57
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Toxicology
Performed
Flight hours
1,000 total · 400 in this make and model · 20 in the last 90 days · 9 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
230° at 20 knots
Visibility
35 statute miles
Lowest ceiling
None
Temperature
84 °F, dew point 48 °F
Altimeter
29.00 inHg
Observed at
PSC, 8 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.