On May 7, 2:41 pm, "Jim Carter" wrote:
I think what you've cited is for bench testing during certification. Once
installed in the aircraft then comparison against the pressure as recorded
by the official weather observation is +/- 75'.

The installed altimeter should give the same reading error
on the ground as it did on the bench unless the static system is way
out of whack, in which case the airplane shouldn't be flown. The
Canadian specs for scale error are he
http://www.tc.gc.ca/civilaviation/Re...ds/t571s02.htm


Dan