MichaelEI
Topic Author
Posts: 119
Joined: Mon Jan 03, 2011 5:39 pm

Question About B757 Spoilers

Sat Mar 12, 2011 11:41 pm

I was watching a YouTube video, below, that featured a 752 landing at LGA. If you watch between 37 seconds and 40 seconds, you will see the spoilers retract slightly and go back to full deployment. I've actually noticed this on my flights on 757s before too. I'm trying to think why that would happen, but being not technically literate as such I would rather ask here. I was thinking along the lines of either the deactivation of the autobrake system to go to manual braking, or the reverse thrust system being taken off. Anyone with insight?

http://www.youtube.com/watch?v=yk1u4tP-AKA&feature=feedrec_grec_index
 
411A
Posts: 1788
Joined: Mon Nov 12, 2001 10:34 am

RE: Question About B757 Spoilers

Mon Mar 14, 2011 1:01 am

Nothing to do with aircraft braking, nor reverse thrust.
Those spoilers are dual purpose, ground spoilers deployed after landing AND differential spoilers, for roll control assist.
Very similar to those spoilers on the later models of the B707.
 
Max Q
Posts: 5634
Joined: Wed May 09, 2001 12:40 pm

RE: Question About B757 Spoilers

Mon Mar 14, 2011 2:07 am

Quoting MichaelEI (Thread starter):

Posted Sat Mar 12 2011 18:41:15 your local time (1 day 2 hours 13 minutes ago) and read 177 times:

I was watching a YouTube video, below, that featured a 752 landing at LGA. If you watch between 37 seconds and 40 seconds, you will see the spoilers retract slightly and go back to full deployment. I've actually noticed this on my flights on 757s before too. I'm trying to think why that would happen, but being not technically literate as such I would rather ask here. I was thinking along the lines of either the deactivation of the autobrake system to go to manual braking, or the reverse thrust system being taken off. Anyone with insight?

What you saw with the slight retraction then reextension of the spoilers is most likely the technique this Pilot used to disengage the autobrakes.



This method, slightly retracting the spoilers will give you a nice smooth autobrake disengagement, which can be tricky to do by just pressing the footbrakes

[Edited 2011-03-13 19:07:37]
The best contribution to safety is a competent Pilot.

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