CS ACNS.D.ELS.025 Altitude source ED Decision 2022/008/R (See AMC1 ACNS.D.ELS.025) (a) The reported pressure altitude is obtained from an approved source. (b) The altitude resolution is less than or equal to 30.48 m (100 ft). (c) The altitude source connected to the active transponder is consistent with the source being used to fly the aircraft. [Issue: CS-ACNS/4]