Authored by: Anonymous on Tue, Oct 14 2003 @ 09:47 in Switzerland

Sounds like instead of air pressure against the workings of the ASI, there is a leak, allowing air to pass THRU the unit. The asi gets pitot or ram air, which should only pressurize, not go to or through the unit, and static air, same deal. The static line should have a water trap, or be run uphill from the static port, to preclude water actually entering the system. If there was a leak in the unit, that would allow moisture to pass thru the system, you would get the problem you mentioned. Jeff, RV4 N605RV

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