AMC1 NCO.IDE.H.120(a)(4)&NCO.IDE.H.125(a)(4) Operations under
VFR & operations under IFR – flight and navigational instruments and
associated equipment
CALIBRATION OF THE INSTRUMENT INDICATING AIRSPEED
(a) The instrument indicating airspeed should be calibrated in knots (kt).
(b) In the case of helicopters with an MCTOM below 2 000 kg, calibration in kilometres per hour (kph) or in miles per hour (mph) is acceptable when such units are used in the AFM.
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