"Derrick Early" wrote in message ...
When I close the door to my 172, the airspeed, vsi and altimeter instruments
jump. Does this mean that I have a leak in my static line? The last check
of the system was 18 to 20 months ago. The last thing that I want is errors
in altitude while flying IFR.

A way you can evauluate this... If you are flying along and you OPEN
the alternate static port and it doesn't do anything... you have a leak.
Usually will change the altitude 50-100 feet.

Bill Hale