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

• ED Decision 2015/004/R found in: Air Operations (965/2012) Part-ARO Part-ORO Part-CAT Part-SPA Part-NCC Part-NCO Part-SPO (Feb 2025)
• ED Decision 2025/023/R found in: Air Operations Revision 24 Part-ARO Part-ORO Part-CAT Part-SPA Part-NCC Part-NCO Part-SPO (Mar 2026)

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 ED Decision 2015/004/R 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. 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 ED Decision 2015/004/R 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. ##### 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 *ED Decision 2025/023/R* **CALIBRATION OF THE INSTRUMENT INDICATING AIRSPEED** (a) The instrument indicating airspeed should be calibrated in knots (kt). (b) In the case of rotorcraft with an MCTOM below 2 000 kg, calibration in kilometres per hour (km/h) or in miles per hour (mph) is acceptable when such units are used in the AFM.