"Peter R." wrote in message
...
cpu ) wrote:


If you haven't already, read the POH about alternate air altimeter errors
and note the conditions (vents open/closed, heat on/off, etc) in the POH
where Cessna documented the error.

You also can engage the alternate error on a VFR day at altitude and see
the altimeter difference yourself. In the SP I flew, the error was about
70 feet higher with the alternate air engaged.

Does engaging the alternate air shut the external static source off? If not,
it's only a partial test.

-- David Brooks