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Let me pick your brains on this one! Coming out of my annual on my 65 M20E, I had a problem with my ASI and took the Mooney twice to have it looked at. First time, nothing done, but I noticed a difference. Second time, 4 hours maintenance to suck everything out of the system and change the atlternate static valve, I saw a noticeable difference for one flight, then everything was back to "anormal". After take off, the speed would move down slowly then barely moved at all. Once on the ground, no change of indication, so attitude or altitude don't seem to be a factor. For troubleshooting sake, I went on alternate static and saw VSI and altimeter jump then settle at their correct values and ASI being at a normal value. When back on primary, ASI was again indicating incorrectly, sometimes on the high side, sometimes on the low side. My troubleshooting seems to point at a faulty primary static source, my mechanic is thinking about clogged or faulty plumbing along the line. Looking at my books, it looks as though the alternate static source joins the plumbing at a "T" joint almost at the start of the plumbing of both sources. Any ideas???
