A320 Cat 3 dual inop
Thread Starter
Join Date: Mar 2017
Location: London
Posts: 172
Likes: 0
Received 0 Likes
on
0 Posts
A320 Cat 3 dual inop
Just curious to know why when the parking brake is set to on and the brake pedals are pressed temporarily CAT 3 DUAL is inop on the status page.
My understanding is that when the parking brake is applied then the brake pedals don't do anything I.e they are disconnected.
Would this be a spurious signal sent from the BSCU to the FWC?
My understanding is that when the parking brake is applied then the brake pedals don't do anything I.e they are disconnected.
Would this be a spurious signal sent from the BSCU to the FWC?
Thread Starter
Join Date: Mar 2017
Location: London
Posts: 172
Likes: 0
Received 0 Likes
on
0 Posts
Must be the BSCU detecting a false failure of one of those temporarily when you press the pedals.
Only half a speed-brake
Pedals pressed but no G hyd pressure applied (due Y prk brk priority) -> incorrect state detected? Cat3 dual also not available during G hyd lo pressure.
Just a speculation...
Just a speculation...
Thread Starter
Join Date: Mar 2017
Location: London
Posts: 172
Likes: 0
Received 0 Likes
on
0 Posts
Another theory from looking at the AMM. When you press the brakes and the braking pressure is more than that applied by the alternate system for parking brake then the normal system will apply braking to meet the demand from the rudder pedals.
Maybe it's from pressing the brakes and the BSCU realises you need some pressure from the green system but of course it's not available.
So it detects the normal braking system is inop. CAT 3 Single.
Clearly the FWC has inhibited showing whatever causes the CAT 3 Single.
Maybe it's from pressing the brakes and the BSCU realises you need some pressure from the green system but of course it's not available.
So it detects the normal braking system is inop. CAT 3 Single.
Clearly the FWC has inhibited showing whatever causes the CAT 3 Single.
