Right Way Up
As long as one speed reference is correct that will be used by SFCC so flap will behave normally. It is in UAS situation where if the incorrect speed of being less than 100kts is taken by SFCC then this problem can happen. ADR 1 supplies lot of systems like EGPWS, TCAS, GPWS terrain and are affected. Also as long as ADR1 or 3 is available landing gear can be normally lowered.