On Mar 3, 8:07*am, GARY BOGGS wrote:
But wouldn't a leak in the system cause the airspeed to read lower?



My guess is the new static line that you plumbed in for the
transponder introduced a leak into the static system. *It should've
been leak tested when the transponder check was completed. Do you know
if that was done?- Hide quoted text -

- Show quoted text -

That depends on whether his cabin pressure is higher or lower than
static. Easy to check with a manometer connected to static on one side
and nothing (cabin) on the other. My fancy manometer is some acrylic
tube in a 'U' shape, and some water.