All IFR/GAT flights or parts thereof operating in 8.33 kHz airspace above FL195 within the IFPZ or below FL195 in the airspaces where 8.33 kHz is implemented, are required to carry the 8.33 kHz radio equipment, except where exemptions apply (as defined in the national AIP of the State concerned) and as specified by the terms of those exemptions. Whenever an aircraft is equipped with the 8.33 kHz radios, the letter Y shall be inserted in Item 10: Equipment, of the filed flight plan.