Changing auto brake setting during roll out
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Changing auto brake setting during roll out
I’ve not seen any specific guidance against this or done it personally
If I’m not getting the required deceleration
i’ll disconnect the AB and manually brake
But I’ve seen it done and curious as to
thoughts on this technique
If I’m not getting the required deceleration
i’ll disconnect the AB and manually brake
But I’ve seen it done and curious as to
thoughts on this technique
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Exactly my thought too. I often use Autobrake low and disconnect it if I need more or less braking. I always try to brake as smooth as possible and take the last high speed exit for the sake of confort and brakes life. If a pilot relies so much on automation on the ground, I would be concerned.
Last edited by pineteam; 22nd Oct 2018 at 04:54. Reason: Typo
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Seen it being done, never really understood the point, especially when people would change it mutiple times during rollout (i.e. 3 to 2, then 2 to 1).
Isn’t it much easier just to press the pedals to disconnect the autobrake and brake manually?
Isn’t it much easier just to press the pedals to disconnect the autobrake and brake manually?
If you are not getting the required deceleration changing the setting might not work if the reason is a fault with the system. Once you work that out you have even less time for the manual option.
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I often changed the auto brake settings on the B757. It was a smooth operation. I never used the technique to increase braking.
It's in the 737 FCOM that autobrakes can be selected and changed during landing roll out. No warning or caution.
It seems like a good/acceptable idea until you accidentally hit MAX
Exactly my thought too.
I don’t use the above technique and prefer to select a slightly lower setting than required and override to disengage.
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Exactly THAT! What a load of BS! Taking your eyes of the runway on rollout to “locate” switches and stuff is simply unprofessional. As far as I’m concerned you touch nothing until clear of runway and spoilers are being disarmed.
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Say you've prepared performance rollout data for a WET runway but during landing its damp at best if anything.
Having checked DRY and WET performance prior to landing, you know that a lower AB setting would make the desired exit in DRY conditions.
Lowering the AB eating to the desired lower one is good airmanship in this case, alternatively, manual braking to disconnect the higher auto brake selected the other option.
Only half a speed-brake
Skyjob: AB usually provides a controlled deceleration rate.
The Boeing RTO OFF-1-2-3-MAX is far superior to AB's LO-MED MAX in the interface, given the task suggested above.
AB: no, unless you really want to do the inevitable.
B: to reduce decel rate? Worked nicely, I seem to remember (steel brakes at the time).
The Boeing RTO OFF-1-2-3-MAX is far superior to AB's LO-MED MAX in the interface, given the task suggested above.
AB: no, unless you really want to do the inevitable.
B: to reduce decel rate? Worked nicely, I seem to remember (steel brakes at the time).
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Routinely in normal conditions doesn't make any sense. But in rain and crosswind etc. if one wants to increase braking effect not a bad idea to change to medium from low. You are assured of even braking.
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Lowering the AB eating to the desired lower one is good airmanship in this case, alternatively, manual braking to disconnect the higher auto brake selected the other option.
Thread Starter
Not necessarily against it, particularly in
adverse conditions with gusty winds and
a wet / short runway
But If you do, I think it should be the PNF
that adjusts the setting, it’s an awkward reach to where the selector is usually
located and an unnecessary distraction to the PF
I was in the jump seat of a 747 Classic a
few years ago however that had the AB selector mounted on the left side of the overhead panel in easy reach of the CA
adverse conditions with gusty winds and
a wet / short runway
But If you do, I think it should be the PNF
that adjusts the setting, it’s an awkward reach to where the selector is usually
located and an unnecessary distraction to the PF
I was in the jump seat of a 747 Classic a
few years ago however that had the AB selector mounted on the left side of the overhead panel in easy reach of the CA
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