Summary
We propose to adopt a new airworthiness directive (AD) for certain Aviat Aircraft Inc. Models A-1C-180 and A-1C-200 airplanes equipped with Rapco part number RA1798-00-1 fuel vent check valves. This proposed AD was prompted by a report that the fuel tank vent check valves are sticking in the closed position causing fuel starvation to the engine. This proposed AD would require checking the fuel vent check valves for proper operation and replacing any inoperative fuel vent check valve with an airworthy part. We are proposing this AD to correct the unsafe condition on these products.