My apology,I thought you were refering to pneumatic's as opposed to hydraulics (e.g landing gears,brakes etc Harrier)
After reading the question I'm now confused !! Are you refering to air regards de-icing,anti-icing,air-conditioning-pressurization or for operating systems (you mentioned a tank)eg.brakes etc.
Last edited by fruitloop; 14th Oct 2003 at 03:59.