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B7A.6.3.1 Effective no later than January 1, 2020, all aircraft must be equipped to meet the ADS-B OUT requirements of 14 CFR 91.225. ADS-B OUT systems must be approved to either TSO-C154c (978MHz Universal Access Transceiver [UAT]) or TSO-C166b (1090MHz Extended Squitter [1090ES]). ................
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