777 spoiler deployment on lamding
Thread Starter
Joined: Apr 2008
Posts: 1
Likes: 2
From: nowhere
777 spoiler deployment on lamding
Quite interesting spoiler deployment on the 777 on landing. Four spoilers(2&5 on left wing, 10&13 on right wing) are completely inhibited from deployment on initial touchdown. As well, the inboard group(or at least some of them) are limited to partial initial deployment. Following a certain minimum time and reduction of AOA, the spoilers that did not deploy or only partially deployed, extend fully.
Also note that the flaperon retracts automatically as well on touchdown.
https://www.youtube.com/watch?v=3_HIcbpzpZw
https://www.youtube.com/watch?v=QLn50RzTA18
Also note that the flaperon retracts automatically as well on touchdown.
https://www.youtube.com/watch?v=3_HIcbpzpZw
https://www.youtube.com/watch?v=QLn50RzTA18
Joined: Feb 2009
Posts: 379
Likes: 0
From: Seattle
777 Spoiler Sequencing on Touchdown
The autospeedbrake sequencing is designed to accomplish a couple of objectives: minimize pitching moment disturbance and ease settling on the gear - particularly for low sink rate landings. If all of the spoilers were fully deployed together, the lift loss could turn a smooth landing into a rather objectionable final drop onto the runway.
