CS
ACNS.D.AC.020 Altitude source
ED Decision 2013/031/R
(See AMC1 ACNS.D.AC.020)
(a) The reported pressure altitude is obtained from an approved source.
(b) The altitude resolution is equal to or less than 30.48 m (100 ft.).
(c) The altitude source connected to the active transponder is the source being used to fly the aircraft.
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