ANNEX IVU.K.COMMERCIAL AIR TRANSPORT OPERATIONS[PART-CAT]
SUBPART DINSTRUMENTS, DATA, EQUIPMENTU.K.
SECTION 1U.K.Aeroplanes
CAT.IDE.A.350TransponderU.K.
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.