We operate according to 98% source data. The rest of our FCOM’s contain operator exemptions. In this chapter I can’t find any exemptions. From the excerpt below I can only conclude that you need to see LAND 3 for any form of CAT III approach. If you are not LAND 3 but LAND 2 the lowest limits are CAT II.
From FCOM I limitations.
CAT II Operations
• LAND 3 or LAND 2 must be annunciated.
• Prior to commencement of the approach, the EICAS messages SGL
SOURCE DISPLAYS, SGL SOURCE RAD ALT or SGL SOURCE ILS
may not be displayed.
CAT III Operations
• LAND 3 must be annunciated.
• Prior to commencement of the approach, 2 autoland status annunciators
and the autothrottle must be operative, and the EICAS messages SGL
SOURCE DISPLAYS, SGL SOURCE RAD ALT or SGL SOURCE ILS
may not be displayed.