CHI00LA252

The pilot reported that he applied full throttle and pushed in the carburetor heat during the go-around, but the engine did not respond normally. He reported that, "It felt like a brake had been applied to the engine. It didn't pick up RPM like normal." The pilot reported the airplane started rolling to the right and he applied left aileron and left rudder to bring the wings level. He reported the airplane "... made an abrupt roll to the left and into the ground." An inspection of the carburetor revealed that the horseshoe washer (Mixture Control Valve Head) was found detached from the Mixture Control Metering Valve and laying in the bottom of the carburetor bowl. When the horseshoe washer was placed back on the Metering Valve, it was loose. The inspection also revealed that the pump plunger assembly, the float valve seat, and the Mixture Control Metering Valve were worn. The carburetor airbox gasket had a smaller diameter than the diameter of the carburetor air intake. The engine was put on a test stand with an operable carburetor and it ran at idle power and at 2,300 RPM's.

On August 9, 2000, at 2140 central daylight time, a Cessna 182Q, N94MB, was substantially damaged when it impacted runway 18 (3,300 feet by 60 feet, asphalt) at the Warsaw Municipal Airport (56M), Warsaw, Missouri, after a partial loss of power during a go-around. The pilot reported the airplane had ballooned during the flare. The airplane's right wing impacted the ground followed by the nose wheel and then the engine. The private pilot and one passenger were not injured. The 14 CFR Part 91 flight had departed Sedalia, Missouri, at 2125 and was en route to Warsaw Municipal Airport, Warsaw, Missouri. Visual meteorological conditions prevailed and no flight plan was filed.

The pilot reported that he applied full throttle and pushed in the carburetor heat during the go-around, but the engine did not respond normally. He reported that, "It felt like a brake had been applied to the engine. It didn't pick up RPM like normal." The pilot reported the airplane started rolling to the right and he applied left aileron and left rudder to bring the wings level. He reported the airplane "... made an abrupt roll to the left and into the ground."

The pilot reported that a pilot who lived north of the airport had reported seeing a "contrail" coming from the airplane during the approach to landing.

An on-site inspection of the airplane revealed there was fuel on board the airplane. The spark plug from the No. 5 cylinder was removed and was dark in color. The engine was not rotated on-site. The flaps, flap handle, and flap indicator were in the full down position.

The engine was sent to Teledyne Continental Motors to be run on a test stand. Prior to the engine run, the following components were replaced: intake tubing for the No. 2, 4, 5, and 6 cylinders; slave exhaust for all cylinders; oil pan; and the carburetor.

The engine started and was run at idle power and at 2,300 rpm.

An inspection of the carburetor at an engine component repair facility revealed the following anomalies:

1. The carburetor airbox gasket had a smaller diameter than the diameter of the carburetor air intake.

2. The pump plunger assembly was worn.

3. The float valve seat was worn.

4. The horseshoe washer (Mixture Control Valve Head) was found detached from the Mixture Control Metering Valve and laying in the carburetor bowl. When the horseshoe washer was placed back on the Metering Valve, it was loose.

5. The Mixture Control Metering Valve was worn.

6. Soot was found around the plunger area for the mixture control metering valve stem.

7. Black soot was found all through the venturi.