What may cause the CAT $2$ annunciation to turn amber on the PFDs$?$If all CAT $2$ conditions are met, a green CAT $2$ annunciation is displayed on the PFDs$.$ If any ofthe required conditions for establishing CAT $2$ goes invalid, the green CAT $2$ will be replacedby flashing amber CAT $2$ annunciation. It will flash for ten seconds and then go steady. Not tobe memorized, examples of conditions required to obtain the CAT $2$ annunciation: RA valid onboth PFDs$,$ Flaps $22,$ LOC and GS valid on both PFDs$,$ no reversions being used on both PFDs$,$CAT II DH set $>80\text{'}$ and $<200\text{'}$ on both DCPs