The FCOM (1.34.25 p.5) doesn't give any tolerance value for standby altimeters, so I'm quite keen to believe that the standard tolerance value (+/-30 ft at MSL) for servo-assisted altimeters apply. Studied this number on the ATPL-Instrumentation Oxford Manual, anyway it might change with airline SOP's ...
Last edited by fredgrav; 9th Feb 2010 at 17:29.