A320 All ADRs Are Wrong during unreliable speed
When switching off two ADRs, you might want to leave PF's side one on.
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Normally it blends inputs from rudder pedals and the two dedicated tillers to command nose-wheel deflections. The ratio is dependent on airspeed.
If ADR 3 might have an unreliability the system hasn't detected (which I think is what we're assuming), and you left it on, it seems like you could still end up with something like a large NWS deflection early in a cross-wind landing (because the ADR thought the airspeed was low when it wasn't).
DSC-32-20-10 P 1/4
The BSCU transforms these orders into nose wheel steering angle. That angle has the following limits, which depend on ground speed and the origin of the orders.
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Uplinker
Why would anyone do that? Because PF habitually will believe in the wrong speed displayed and could get in trouble.
When switching off two ADRs, you might want to leave PF's side one on.
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topla abicim
The whole discussion has gone on the wrong track. Your first condition was all ADRs are wrong. So you keep one only for stall warning. After that you are treating that one as good one. No this one is also bad so the three options you mention are really not available. You will land not as dual ADR fail procedure but triple ADR fail. So the gear is lowered by gravity anyway. GPWS if available with faulty ADR1 you will use it only to your peril. And triple ADR fail procedure doesn't say NW steering as inop. You will have to depressurise the aircraft manually because faulty ADR is not going to do it.
During Un.Speed ADR Cx Proc you aware that your all adr are wrong
You have to turn 2 of them off (IF THERE IS NO BUSS)
My question is which one should remain?
As I know,
If you keep ADR1 you can maintain XPDR/ATC1 and GPWS
If you keep ADR2 you can maintain XPDR2 and NW/STR
If you keep ADR3 you can use you LDG GEAR otherwise GRAVITY
You have to turn 2 of them off (IF THERE IS NO BUSS)
My question is which one should remain?
As I know,
If you keep ADR1 you can maintain XPDR/ATC1 and GPWS
If you keep ADR2 you can maintain XPDR2 and NW/STR
If you keep ADR3 you can use you LDG GEAR otherwise GRAVITY
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Try thinking outside the box. GPS ground speed is available on pretty much all hulls after MSN 800ish.
Would have saved AF 447 if it was used or recognised
Fly the plane. Keep the nerdy stuff on the ground!
Would have saved AF 447 if it was used or recognised
Fly the plane. Keep the nerdy stuff on the ground!
But of course, he knew which ADR's he had 'failed'. I didn't.
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