20000324011599A

(-23) A/c was on a flight from whiteman airport, CA to stellar airpark, AZ. Planned calculated fuel burn was for 4.5 gallons per hour. The engine on the a/c is a converted vw engine called a "revmaster" which uses a "posa" fuel metering device. During flight, this fuel metering device rotated to the full rich position causing the engine to burn much more fuel per hour than planned. Pilot noticed the low fuel indication and diverted to buckeye to no avail. The engine quit 15 miles short of buckeye. A glide was established and the pilot force landed on the median of interstate 10 substantially damaging the a/c. (.4)on March 24, 2000, at 1116 hours mountain standard time, a scovil KR-2, N73BP, collided with trees while performing a forced landing in the median of highway 10 near Tonopah, Arizona. The commercial pilot, the sole occupant, was not injured. The airplane sustained substantial damage. The personal flight was flown under the provisions of 14 CFR part 91 when the accident occurred. The airplane had departed from whiteman airport near los angeles, California, at 0800 pacific standard time, and was destined for steller a irpark airpark in chandler, Arizona. Visual meteorological conditions prevailed at the time of the accident. A VFR flight plan was filed. According to the pilot, past the halfway portion of his flight, he noticed the fuel gauge was reading lower than it should have. He said that he had already decided to land at the next closest airport to troubleshoot the problem. The fuel-metering unit has a needle, which, according to the pilot, rotated and allowed an increase in the fuel mixture. The pilot said that he slowed his descent, reduced the throttle, and got to within 15 miles of buckeye airport when the airplane ran out of fuel. The pilot decided to attempt a landing on the I-10 freeway. As he maneuvered and got lined up over the eastbound lane, he said he saw power lines at the last second and had to dive under to avoid hitting them. After the landing, he said he noted that the right wing of the airplane was sheared off at the fuselage, the right landing gear leg casting broke in half, and the landing gear collapsed aft into the gear up position. In the pilot operator report, the pilot stated that the airplane had a posa fuel-metering device installed on it. The fuel-metering device device installed on it. The fuel-metering device has a main fuel flow, which is metered by a needle with a flat milled area along the length of it. The needle reportedly slides in and out of a tube, which changes the area that the fuel feeds through. During the mid portion of the flight, the needle rotated slowly making the mixture go rich as the flight continued. This continued to progress and dramatically increased the fuel consumption rate until the tank ran dry. The pilot stated he inspected the posa the day after the accident and confirmed that the needle had rotated 90 degrees from the original setting to a position where the airflow was creating a siphon effect.