Many parameters are available from Mode S, ADS-B UAT (Universal Access Transceiver) and ADS-B ES (Extended Squitter) i.e. (Mach number, indicated airspeed, vertical speed, heading etc.) There are no provisions about how or if there a need to check them for validity. Mode C for example is supposed to be checked when the aircraft is identified for the first time but there is nothing in ICAO documents about other data.
IFATCA Policy is:
When using downlinked Altitude (PSA):
|See: Resolution B4 – WP92 – Conchal 2019|
Last Update: September 29, 2020