Hi!
Was mir bekannt ist:
"Outer ring : For selection of the units for the barometer reference-either hectoPascals or inches of mercury.
Note : The unit selected does not appear on the PFD.
Inner knob : For selection of the reference value displayed in the barometer reference display window and on the PFD below the altitude scale.
At FCU initialization, the window displays 1013 or 29.92, depending on the unit selected.
Pulling the knob selects the standard baro reference setting. The PFD then displays "STD." (Rotating the knob has no effect.)
Pushing the knob from the STD position makes the last selected QNH baro setting displayed."
MfG
Stephan
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