Digifly FMS50MM, User Manual

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To zero QFE press ALTIM key to select QFE, then
push the PRESS key (the field becomes red), the
press the LEFT key of the group of 4. QFE will be
set to 0. After 10 seconds of inactivity the field will
return black. To zero QFE display on fmsAT press
for at least 3 seconds the down arrow. QFE zero
on fmsAT does not reset the EFIS display.
To set at desired values QFE/QNH, after selection increase or
decrease the value with the UP or Down key of the group of 4, then
push again PRESS.
5.5 Altimeters adjustment (EFIS)
5.5.1 Zero QFE
5.5.2 QFE/QNH Adjustment