Pressurization
My 337 was a cloud seeder in the Middle east till last August. Read work /farm aircraft. A winter of overhaul and new gadgets has everything working but the pressurization. New cessna door seal, storm windows sealed, avionics bay cover tight, nosewhell steering boot replaced, generally prc d all the holes. Presure differential gauge barely comes off the peg giving about 1500 ft cabin actual diferential up to 15,000 ft.
What are the other common places or things to look at.
Help greatly appreciated.
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