NC13776

On July 23, 2015, about 1800 eastern daylight time, a Kinner Sportster B, NC13776, was substantially damaged during a forced landing at Merritt Field (4PN7), Eagles Mere, Pennsylvania. The private pilot was not injured. Visual meteorological conditions prevailed, and no flight plan had been filed. The local personal flight was conducted under the provisions of 14 Code of Federal Regulations Part 91.According to the pilot, the airplane had undergone a 7-year restoration, which was completed during October 2014, and at the time of the accident, had logged about 8 hours of flight time since then.

The pilot further noted that on July 18, 2015, after an earlier flight that day, the airplane's Kinner B-5 engine lost power on takeoff, but the pilot was able successfully land the airplane. "We found gas running out of the carburetor and believed the float was stuck. The engine appeared to have drowned by virtue of the rich mixture."

The airplane was subsequently hangared, and the following week, the carburetor was cleaned and inspected. "The float was determined to be intact but the float valve was not seating perfectly. It was removed, blued, reseated, reblued, and tested. The carburetor was reinstalled and found to still be leaking."

The carburetor was then removed and re-examined, and the float was found to be "slightly sticking. A modest portion of material was removed from the float bowl where the sticking was occurring, the carburetor was checked in multiple angles, it was reinstalled. It no longer leaked or flooded. Two separate IA's inspected the work."

On the day of the accident, the airplane was tied down and the engine run for "an extended period at full throttle [later stated to be 8 to 10 minutes] to verify there were no operational issues. Fuel was confirmed at 3/4 tank."

The pilot subsequently took off, climbed the airplane to 50 feet above the runway, and landed straight-ahead on the runway to confirm no anomalies. He then made another takeoff, and about 150 feet above the runway, the engine stopped. The airplane was then not in a position to land on the runway, so the pilot landed off runway, and during the landing, the fuel tank ruptured and the engine broke away from the fuselage.

The engine was sent to an overhauler/builder, who did not find any preexisting mechanical anomalies. The pilot also confirmed that the Holley carburetor main metering jet had not dropped out, as had occurred in another accident, NTSB accident number WPR15FA121.

The pilot further confirmed that the airplane did have carburetor heat, but that he did not use it in flight – including the short takeoff and landing flight, and the accident flight.

The nearest recorded weather, at an airport 20 nautical miles to the southwest, about the time of the accident and about 1,500 feet lower elevation, included a temperature of 26 degrees C and a dew point of 12 degrees C. Although not specific to any particular carburetor, a carburetor icing probability chart found in Federal Aviation Administration Special Airworthiness Information Bulletin CE-09-35, indicated that under the likely ambient conditions at 4PN7, there was a probability of "serious icing at glide power."