15
$\begingroup$

I have come across a new feature called BTE (Brake to Exit) on the 777X, but I am unable to find any documentation related to that. There are vendors who are working on this technology for the 777X.

$\endgroup$
  • 9
    $\begingroup$ Hint: watch the spelling: searching for "brake..." instead of "break..." will give much better results ;-) $\endgroup$ – PerlDuck Sep 6 at 8:17
  • 8
    $\begingroup$ @PerlDuck I dunno. After the 737 MAX debacle "Break to exit" does sound like it might be a new Boeing feature... $\endgroup$ – Machavity Sep 6 at 12:45
  • 9
    $\begingroup$ The feature is as follows: during high-speed taxi, the pilots remove their seatbelts and brake sharply. They then exit the plane via the windshields. $\endgroup$ – David Richerby Sep 6 at 16:39
26
$\begingroup$

It is a system that Airbus already uses in the A380 and some A350's. They call it BTV (Brake to Vacate).

It allows the pilot to select a certain runway exit in advance (e.g. while approaching). After touchdown, the plane automatically brakes so it can vacate the runway at that given exit.

Airbus says:

When the pilot chooses a runway exit point, the system indicates the estimated runway occupancy time and the minimum turnaround time. During the subsequent landing phase, and according to encountered runway conditions (i.e. 'wet' or 'dry'), the aircraft's deceleration is automatically regulated so it reaches the chosen exit at the correct speed.

(emphasis mine)

The BTE system by Boeing is a similar system with a different name. A related article in Avionics International about the B777X states:

“We have also added new safety features like optimal runway exiting and brake-to-exit, which will allow a pilot to tie an airplane’s rollout and stopping distance to a specific runway exit,” said Kirk Scarbrough, Boeing’s 777X systems chief engineer.

See also

$\endgroup$
  • $\begingroup$ thanks for the info. Any idea if it helps while landing in cross winds to do the course correction? $\endgroup$ – NitinG Sep 6 at 11:17
  • 3
    $\begingroup$ @NitinG I can only tell for Airbus' BTV. It doesn't do anything actively while the plane is still in the air and subject to crosswinds. It just announces to the pilots that the desired exit can or cannot be achieved via the PFD and an aural message ("RWY TOO SHORT"). Only when the plane has actually touched down it will apply the wheel brakes (automatically) and possibly tell (read: yell at) the pilot to apply reverse thrust if needed. It doesn't do any course correction while airborne, it just hits the wheel brakes. $\endgroup$ – PerlDuck Sep 6 at 11:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.