Originally Posted by
BoeingDriver99
Hi there,
Brake To Vacate; is the deceleration linear or does it vary depending on factors such as velocity/lateral acceleration/runway conditions etc?
Thanks,
BD
On the A350, the deceleration varies according to the runway condition. The system has two modes: BTV on dry or wet runways, and BTV CONTAM on contaminated runways. BTV mode ramps up the braking after nose wheel touchdown, to achieve a maximum deceleration of 0.2 g (0.35 g in the event of a missed exit scenario). BTV mode aims to achieve a groundspeed of 10 knots about 60 m from the selected exit and may delay brake application if the exit is a long way down the runway, to minimise runway occupancy time. BTV CONTAM mode does not delay brake application and ramps up the braking to a maximum of 0.3 g (0.35 g for a missed exit). The maximum deceleration may not be reached if the antiskid activates. BTV CONTAM mode does not take into account the distance from the aircraft to the selected exit, and releases the brakes when the groundspeed is approx. 10 knots.