Norman-University of Oklahoma Westheimer

According to air traffic control communication and radar data, the flight was VFR over the top, approximately 7,900 feet, and requested an IFR clearance to the destination airport. The flight was issued an IFR clearance and, subsequently, was cleared for the localizer runway 03 approach. Radar data indicates that the airplane intercepted the localizer and began tracking inbound. Once the airplane reached the final approach fix, the airplane entered a shallow descent, but did not reach the MDA until after passing the missed approach point (MAP). The airplane flew past the MAP, continued to descend and over flew the runway. The final radar return was captured at 1,200 feet and one mile northeast of the airport, where the airplane was later located. The weather observation facility located at the airport reported that, 11 minutes before the accident, the winds were from 140 degrees at 6 knots, ceiling 200 feet overcast, visibility 1/4 miles in fog, temperature 45 degrees Fahrenheit and dew point 45 degrees Fahrenheit. A person who was at the airport at the time of the accident reported that the "clouds were low and visibility was poor." Toxicological testing performed on the pilot by the FAA's Civil Aeromedical Institute, Oklahoma City, Oklahoma, revealed the following: 0.121 (ug/ml, ug/g) amphetamine detected in blood, 0.419 (ug/ml, ug/g) amphetamine detected in liver, amphetamine detected in kidney, 4.595 (ug/ml, ug/g) methamphetamine detected in blood, 5.34 (ug/ml, ug/g) methamphetamine detected in liver, 3.715 (ug/ml, ug/g) methamphetamine detected in kidney, pseudoephedrine present in blood, and pseudoephedrine present in liver. The airframe and engines were examined and no anomalies were discovered that would have affected operation of the flight.

As the airplane was deviating around low intensity weather returns, and passing through 20,500 feet during climb out, it departed controlled flight and entered a right spiral. Descent rates exceeded 16,600 fpm during the descent from 18,300 feet to 3,900 feet and then slowed. Witnesses stated they saw the airplane descend from the clouds in a right flap spin. The empennage had separated from the airplane in pieces. Pieces of the wreckage were found up to 1.5 mile from the primary impact point. Both wings remained attached. The right engine was flamed out, and the propeller was feathered at impact. No mechanical reason for the flameout could be determined. At no time did the pilot indicate he was having difficulties. The NTSB weather study indicated that moderate turbulence was present in the area. The pilot's toxicology tests found 0.151 ug/ml of chlorpheniramine in the blood; normal therapeutic concentration is 0.01 to 0.04. Effects of overdosage include sedation, diminished mental alertness, and cardiovascular collapse to stimulation. The pilot, sole on board, was killed.

The aircraft crashed after starting a go-around or aborted landing at Norman, OK. The aircraft was on a cross-country flight from Dallas to Wichita. There was no radio communication with the aircraft after it was cleared to land. The approach looked ok but on short final the aircraft suddenly turned right, leveled then entered a steep climbing right turn and continue to roll until inverted then pitched nose down until crashing. The pilot in the right seat had reportedly worked late the night before installing what appeared to be an auxiliary fuel system in the cabin. The aircraft had just been sold and the identity and location of the owner was not established. No one claimed the wreckage. Evidence revealed that both propellers were rotating at high rpm at impact. The fire after impact burned most intensely and persistently in the center of the cabin where the remains of what appeared to be an auxiliary fuel system were found. No pre-impact malfunctions or failures were found. Both occupants were killed.

The crew was engaged in a local test flight out from Norman Airport, consisting of various tests (stalls) in specific conditions. In flight, the pilot-in-command engaged the aircraft in a stall when control was lost. The airplane entered a dive and eventually crashed in a wooded area located in Rosedale, about 28 miles southeast of Norman Airfield. The aircraft was destroyed and all threes occupants were killed.