Airport Requirements for Autoland in CAT 1 or Better
FWIW: The Automatic Landing System perofrmance has been demonstrated during type certification with CAT 11 or CAT 111 ILS qualify beam, nevertheless automatic landing on CAT 1 ILS quality beam is possible provided the Airline has checked that the guidance below 200ft is satisfactory.
Operators should ask the airport authorities on ILS ground equipment quality and also check that specific restrictions do not apply with CAT 1 only.
Terrain profile before the runway threshold has to be considered since it can significanlty affect the automatic landing system performance. Also Automatic landing can only be performed on runways listed in the airlines operations manual.