Originally Posted by
Miles Long
So what happens if you turn 2 and 3 off and it turns out number 1 is stuffed.
Why don’t you look up first and check if one has an amber light illuminated before you rush in and turn two good ones off.
3 ADRs off results in a world of hurt/BUSS.
And when you’re looking up switching 2&3 off the F/O loses his instruments.
Under most situations, I’m going to get an ECAM if I have a faulty ADR (that has been detected). Why do I need to bother looking for amber lights on the overhead when I’m plunging to the earth, when even if it is stuffed, it’s still going to stop the aircraft from putting in nose down inputs that I can’t stop.
The problem is when none of the systems detect a fault, like in the QF72 case. But again, alternate law will stop the abrupt nose down pitching.
As for the FO losing his instruments, big whoop. There’s still a set on my side.
No Instruments on the FO side, or plunging into the ground, I know what I’d choose.
Finally Miles, it’s a procedure that is an absolute last resort when nothing else is working and still lets you fly the aircraft.