AMC1 NCO.IDE.H.120(a)(3)&NCO.IDE.H.125(a)(3) Operations under
VFR & operations under IFR – flight and navigational instruments and
associated equipment
CALIBRATION OF THE MEANS OF 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.
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