AMC1 NCC.IDE.H.120(a)(3)&NCC.IDE.H.125(a)(3) Operations under VFR & operations under IFR – flight and navigational instruments and associated equipment    

CAA ORS9 Decision No. 1

CALIBRATION OF THE MEANS FOR MEASURING AND DISPLAYING PRESSURE ALTITUDE

The instrument measuring and displaying pressure altitude should be of a sensitive type calibrated in feet (ft), with a sub-scale setting, calibrated in hectopascals/millibars, adjustable for any barometric pressure likely to be set during flight.