ASN Wikibase Occurrence # 40421
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| Date: | Friday 18 December 1998 |
| Time: | 10:15 LT |
| Type: |  Rutan VariEze |
| Owner/operator: | Stephen Claude Parkman |
| Registration: | N81EZ |
| MSN: | 00001 |
| Engine model: | GM Geo Metro 1.3 LITER |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Tucson, AZ -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | (KRYN) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
This was the maiden flight in the aircraft, and during construction, the pilot made numerous design modifications to the airplane which had changed the flight and performance characteristics. Instead of the airplane's engines recommended by the designer, the pilot had installed a GM Geo Metro automobile engine, which the pilot altered by the addition of a Mitsubishi turbocharger. The pilot also altered the fuel computer chip to adjust the fuel flow, attempting to achieve a 2-gallon-per-hour consumption rate. The pilot told associates that the engine produced 78 hp at 4,800 rpm. Engine technical data showed the actual power output of the unmodified engine to be 79 hp at 6,000 rpm. Severe detonation was found in the engine during postaccident examination and it is believed that it most likely would produce only 55 percent of rated power. Following takeoff, witnesses saw the aircraft in a nose high attitude and it never achieved more than 100 feet agl. Some witnesses said the nose attitude was as high as 15 to 20 degrees just before the crash. The pilot radioed that he was having a problem and said he had to put the aircraft down. The airplane collided with a tree during the attempted forced landing and a postcrash fire consumed the wreckage.
Probable Cause: The pilot's failure to attain and maintain an adequate flying airspeed during the aircraft's maiden flight, which resulted in a stall/mush condition. Also causal was the pilot/builder's decision to modify the engine and the fuel system control microchip, which resulted in detonation and a severe reduction in power output, and led directly to the pilot's inability to attain and maintain airspeed.
Accident investigation:
 |
|
Sources:
NTSB LAX99FA052
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 04-Apr-2024 11:42 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report] |
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