cav-not-ok
What is the situation? In case of icing of Pitots if you switch of ADR2 FO looses his speed, with ADR1 Capt. looses speed. ADR3 is loss of standby. But it doesn't matter if all are faulty. With AoA blocked speeds are valid and you need it so PF should switch off the other two. What computer rejects will depend. It is a voting system so two similar reading ADRS will reject the third disagreeing ADR. But that is not always correct because in case of two faulty but similar reading ADRs the lonely correct ADR will be rejected. With all triple ADR failure or double ADR failure CAS/Mach disagree if second is not self identified you get alternate law without protections. With double ADR failure alpha disagree you get alternate law with reduced protections.
Last edited by vilas; 5th Jan 2015 at 19:04.