NTSB Identification: FTW01LA168.
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Accident occurred Monday, July 23, 2001 in Marion, TX
Probable Cause Approval Date: 07/01/2002
Aircraft: Schnitz FIIC-2 Goshawk, registration: N393Y
Injuries: 1 Fatal,1 Serious.

NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The two pilots were conducting a high speed taxi test run when the bi-wing, experimental, amateur-built airplane inadvertently took off. Witnesses observed the tandem-seat airplane make a "sharp turn to the left", "stall," impact terrain and catch fire. During the brief flight, witnesses heard a surging noise. The airplane had never been flown before and had been issued an experimental airworthiness certificate two months prior to the accident. According to people at the airport, the front seat pilot had been working on the airplane for over a year and had never flown it. They added that the propeller governor had been removed and reinstalled a few days prior to the accident. The rear seat pilot stated that it was his understanding that the airplane was not supposed to takeoff. Toxicology tests on the front seat pilot revealed 0.05 ug/ml of diphenhydramine in the pilot's blood, an unquantified amount of diphenhydramine in the liver, and 1.076 ug/ml of acetaminophen in the pilot's blood. Acetaminophen is an over-the-counter pain reliever commonly known by the trade name Tylenol. Diphenhydramine is an over-the-counter antihistamine. A study on the effects of diphenhydramine on driving performance revealed that the drug significantly impaired a person's ability to maneuver an automobile. Examination of the propeller governor revealed that the booster pump drive shaft was coated with what appeared to be a cooked oil coating, and the pilot valve was sticking inside the booster pump drive shaft. It could not be determined if the cooked oil coating was a result of the post crash fire or a pre-existing condition.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

the loss of control on takeoff for undetermined reasons.

Full narrative available

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