Touch the Barometric Altimeter Datafield
Button (Kollsman window).
Touch the STD BARO Button.
'STD' will be displayed in the barometric setting window, indicating that the standard
barometric setting is active.
Or:
If the DCK is configured to adjust the barometric setting, push the DCK to
toggle the standard barometric setting between 'STD' and the previously set (or preset)
altimeter setting.