Pawnee Fuel Tank Question

Thanks. It’s all torn apart now, tank off the airplane, and I suspect fuel’s been leaking around the outflow hardware, based on some slight corrosion (from accumulated water in fuel) and absence of much sealant on the threads. Original bladder looks pretty good. The original drain mast must’ve broken off at some point and a poorly fabricated one grafted on. Leaked fuel helped debond the fiberglass patch holding the drain on. We’ve fabricated a much better replacement drain. Will bond that on, reassemble, and leak check before reinstalling.

Larry Ruggiero

This probably doesn’t help you. One of the Pawnee’s I work on has an aluminum tank. It’s a one time STC that some Boeing engineers came up with. I’ve done one repair on it. It’s a pretty cool design!