A340 Altimeter tolerances on ground??

[Alan Partridge!]

I'm trying to find out what the accepted tolerances, with primary altimeters, for dispatch on the ground during preflight. Been raking through the FCOMs and Ops Manuals and can only find reference to Altimeter error for RVSM of +-200ft. Been bugging me! Please help. Alan

[SMOC]

IIRC PFD's within +/- 20' and within +/- 25' of airfield elevation.

The reason I remember is the analog portion of the PFD altimeters is in units of 20'.

[Alan Partridge!]

Excellent..cheers for the response. Alan