FTW88FA164

NTSB accident investigation · Piper PA-28R-201T · Okmulgee, OK · September 18, 1988

Accident · FatalField investigationFinal report
Date
September 17, 1988, 23:02 local (Sep 18, 1988, 04:02 UTC)
Place
Okmulgee, OK
Injuries
1 fatal
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N47806Piper PA-28R-201T
Weather
Instrument (IMC) · Night/dark
Status
Completed · report January 16, 1990
Report
Approved by Office Director
FAA report
19880917045409A
Case key
22564

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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Probable cause

Non-instrument rated pilot's intentional flight into an area of adverse weather associated with thunderstorms, heavy precipitation, and turbulence. The pilot experienced vertigo and lost control of the aircraft. The aircraft then sustained an infight breakup at a high altitude.

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
Flight into known adverse weather - intentionalPilot in commandCause
Light condition - dark nightFactor
Weather condition - cloudsFactor
Weather condition - low ceilingFactor
Weather condition - fogFactor
Weather condition - turbulenceFactor
Vfr flight into imc - continuedPilot in commandCause
Loss of control - in flightCruise
Aircraft control - not maintainedPilot in commandCause
Spatial disorientationPilot in commandCause
Lack of total instrument timePilot in commandFactor
Airframe/component/system failure/malfunctionDescent - uncontrolled
Design stress limits of aircraft - exceededPilot in commandCause
Wing - overload
Wing - separation
Horizontal stabilizer attachment - overload
Horizontal stabilizer attachment - separation
In flight collision with terrain/waterDescent - uncontrolled

Analysis

The non-instrument rated plt contd VFR flt at night into an area that wx briefers & ATC controllers had warned of thunderstorms, heavy precipation & possible tornado activity. Subsequently, he requested 'a little guidance' & said he was having trouble 'holding a position' & was 'running on a . . . Magnetic compass.' Subsequently, the acft entered a steep descent, then radio & radar contact were lost. The acft broke up in flt at an unknown alt & wreckage was scattered over a 3 mi area. An exam of the wreckage revealed the rgt wing had failed under positive loads (upward) &the the left horizontal stabilizer spar was bent downward. The rgt horizontal stabilizer separated & was not found.

Aircraft

Registration
N47806
Reported as
Piper PA-28R-201T (PA-28R-201)
Category
Airplane
Serial number
28R-7803017
Airframe hours
1,447
Engine
Continental TSIO-360-F, 200 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Operator
Richard Smith Enterprises
Registered owner
Richard Smith Enterprises
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 5, 1988 · 87 hours before
Departed
JAN · Jackson, MI
Destination
PWA · Oklahoma City, OK

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
50
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--no waivers/lim.
Seat
Left
Toxicology
Performed
Flight hours
2,000 total

Weather

Conditions
Instrument (IMC) · Night/dark
Wind
180° at 11 knots
Temperature
82 °F, dew point 72 °F
Altimeter
30.00 inHg
Observed at
TUL, 40 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.