MIA96LA123

NTSB accident investigation · Vernon L. Cox COX-HAWK · Mebane, NC · April 20, 1996

Accident · Serious injuriesLimited investigationFinal report
Date
April 20, 1996, 10:05 local (14:05 UTC)
Place
Mebane, NC
Injuries
1 serious
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N7VCVernon L. Cox COX-HAWK
Weather
Instrument (IMC) · Day
Status
Completed · report September 24, 1996
Report
Approved by Office Director
FAA report
19960420007989A
Case key
38009

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

The pilot's inadvertent flight into instrument meteorological conditions in an airplane not equipped with appropriate instrumentation which led to the pilot's inability to maintain control and spatial disorientation. In addition, during an attemped recovery from the loss of control, the airplane exceeded Vne which resulted in failure of the aileron flight control system and flying wires. Contributing to the accident was the failure of the pilot to obtain a preflight weather briefing and the unsuitable terrain encountered during the forced landing.

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
Preflight planning/preparation - inadequatePilot in commandFactor
Weather condition - cloudsFactor
Vfr flight into imc - inadvertentPilot in commandCause
Loss of control - in flightCruise - normal
Aircraft control - uncontrolledPilot in commandCause
Spatial disorientationPilot in commandCause
Airframe/component/system failure/malfunctionDescent - uncontrolled
Wing,bracing wire - overload
Design stress limits of aircraft - exceededPilot in commandCause
Forced landingEmergency landing
Nose overEmergency landing
Terrain condition - rough/unevenFactor

Analysis

During cruise flight the pilot encountered adverse weather ahead. He initiated a 180-degree turn but inadvertently entered clouds. The pilot became spatially disoriented and the airplane began descending with the airspeed increasing beyond Vne. The aileron system then failed and 2 of the 6 flying wires for the left wing also failed. The flight descended below the base of the clouds about 1,300 feet above ground level and the pilot made a forced landing into a field. After touchdown in a rough field the airplane cartwheeled and came to rest upright. The pilot did not obtain a weather briefing before takeoff, and the airplane was not equipped with instruments for controlling the airplane without reference to terrain.

Factual narrative

On April 20, 1996, about 1005 eastern daylight time, a homebuilt Cox-Hawk, N7VC, registered to a private individual, was substantially damaged during a forced landing near Mebane, North Carolina. Visual meteorological conditions prevailed at the time and no flight plan was filed for the 14 CFR Part 91 personal flight. The commercial-rated pilot sustained serious injuries. The flight originated about 0945 from a private airstrip near Apex, North Carolina.

The pilot stated that he did not obtain a weather briefing before takeoff. After departure during cruise flight between cloud layers with adverse weather ahead, he initiated a turn to perform a 180-degree turn to avoid the weather. The airplane which was not equipped with an attitude indicator or turn coordinator then entered clouds. The pilot further stated that the airplane began descending with the airspeed increasing beyond the designed never exceed speed(Vne). During the descent he felt buffeting through the airframe and observed that two of the six flying wires for the left wing were failed and the aileron flight control system was failed. The airplane emerged from the clouds about 1,300 feet above ground level and the pilot arrested the descent then selected a field for the forced landing. After touchdown in a rough field, the airplane cartwheeled and came to rest upright.

Aircraft

Registration
N7VC
Reported as
Vernon L. Cox COX-HAWK
Category
Airplane, amateur-built
Serial number
A001
Airframe hours
170
Engine
Lycoming IO-540, 300 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Registered owner
Vernon L. Cox
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · March 15, 1996 · 22 hours before
Departed
NC81 · Apex, NC
Destination
MTV · Martinsville, VA

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
66
Certificates
Private, Commercial
Airplane ratings
Single-engine sea, Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Center
Flight hours
8,000 total · 2,000 in this make and model · 8,000 as pilot in command · 50 in the last 90 days · 20 in the last 30 days

Weather

Conditions
Instrument (IMC) · Day
Wind
220° at 14 knots
Visibility
10 statute miles
Lowest ceiling
2,200 ft overcast
Temperature
68 °F, dew point 63 °F
Altimeter
30.00 inHg
Observed at
RDU, 26 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.