Kontrollitavas õhuruumis lendamisel peab õhusõidukil, välja arvatud purilennukil lendamisel selleks ette nähtud õhuruumialas, olema töörežiimis A/3+C sisse lülitatud sekundaarradari transponder.
Aeroplanes shall be equipped with a pressure altitude reporting secondary surveillance radar (SSR) transponder and any other SSR transponder capability required for the route being flown.
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