Hf equipment on board cat with aoc ti ooerate within or out of ecac states

[ATC Watcher]

I am not a specialist of EU rules for HF carriage , but ifa document mention SELCAL, , from the ATC side in practice SELCAL is only performed on HF . ( although in theory if can be used on VHF as well be never see it done ,) so if SELCAL is mandated, it most probably refers to HF