In article ,
says...
I want to know how to change the zero offset value (screen #10 ASI
reading), which is wrong. Can it be done without opening the 302 -
opening it will break the security seal and prevent it being used for
badge claims !!!

I was told a while ago that the ASI zero offset is determined
automatically by the instrument whenever it is turned on, and does not
require any adjustment by the pilot.

--
-------
Eric Greenwell USA