Question: If I'm flying at 3000 feet MSL, 120 KIAS, OAT ~ 55 F, fresh air vents in the cabin open, and I switch to my alternate static source (what you would do if the static ports got plugged with ice), what would you expect to see on the Altitude/IAS indicators? I tried this as a test today. I was expecting to see a jump of some sort but I saw nothing. Switched to cabin-air for about 3 seconds before switching back. I tried it twice. Would you assume there's a leak in my static system or is this an inconclusive test?