[Stephen Rochna]

Stephen Rochna on June 20, 2016 at 6:53 am #18224

Al:
Are the indicators showing zero while parked ( I would guess they are)? Do you have an alternate static source inside the cabin, and is it closed?

The best ( easy and cheap) way to check for a static leak in the cabin is to fly the plane and while in flight, open and close the vent window. Check the static and pitot/static instruments while doing this. If they jump when the window is opened, you have a static leak in the cabin.
V/r
Steve

[Al Lipper]

Al Lipper on June 19, 2016 at 11:28 am #18223

I’ve got an odd sort of issue in my Saratoga SP. My indicated airspeed is showing 5-10 knots higher that it actually is at cruise. This is based on cruise speed higher that expected and double-checked against ground speed (doing test runs in opposite directions and averaging ground speed).

I have an analog IAS as well as an Aspen PFD 1000. Both show the same thing (5-10 kts. high). Avionics shop said pitot-static system was very tight and IAS indications from their tests were accurate.

Only idea I had was maybe a partially blocked pitot drain hole. Could this do it?

I’d be grateful for any other ideas. Thanks.

Al