00:00The moment of passenger jets will hit the runway, the engines suddenly cut loud, panels
00:04on the wing flip straight up, and the signal gets rolled forward in their seat.
00:08It looks teoric, but every single one of those things is a separate braking system, firing
00:12in a precise thickness, because a 200-ton aircraft, moving at over 150 miles an hour,
00:18cannot stop the same way you are called as.
00:20At that speed, the wings are still generating enough lift to practically keep the plane
00:24flying, which means by a little of its weight is actually pressing down on the tiles.
00:27And without weight on the tiles, wheel brakes are almost too flat, because there is not
00:32enough friction to keep the runway.
00:33By the end of this video, you will note the exact T-system sequence that solves this, in
00:37the precise order it happens, and while skipping even one step can turn a routine landing into
00:42a runway overlay.
00:43The wheel brakes, the ones doing the job you had as you met as most, are actually the last
00:47system to become fully effective, not the first.
00:49The real first move is not slowing the plane down at all, it is making the plane so flying.
00:54We will get to exactly how that happens in the next few seconds after touchdown.
00:57The instant the main landing air compresses under the aircraft's weight, sensors detect
01:01it and the flight computer commands a door panel.
01:04On top of the wing's car ground spoilers, they snap upright almost instantly.
01:08These spoilers do two critical jobs at once.
01:10They destroy the wing's remaining lift, and they add aeroban in drag.
01:13Killing the lift is the key move, because it transfer the aircraft's full weight onto the
01:17landing gear.
01:18And that is what finally gives the wheel brakes enough friction with the runway to explore.
01:21A few seconds later, the pilot puts the thrust reverse into reverse, activating the thrust
01:25reversal.
01:26On most modern jet engines, panels like that will repeat gain that redirect a large portion
01:31of the engine's bypass clear forward instead of backward, essentially using the engine's
01:35own clear floor to push against the direction of travel.
01:37This can generate a significant share of the total stopping force, and it is especially valuable
01:42on wet or icy runways, where tire friction alone is not reliable.
01:46Meanwhile, the rear brakes are down the sheer of the work route, and on almost every modern
01:50airliner.
01:51This happens automatically through a system called autobricks.
01:54Spoilers lack of breathing intensely before landing, based on run-wheel tech and conditions,
01:58and the system applies consistent computer-control pressure to the brakes, using an anti-scale system
02:04that prevents energy from locking up and skidding, similar to anti-lock brakes in a car, but
02:09far more precise.
02:10As the aircraft slows down, the balance of fuel is during the world shifts dramatically.
02:13Reverse thrust is most powerful early, right after touchdown, at highest, but it becomes
02:18far less effective as free drop, and spoilers practically stop the reversal around 2 to 70 knots.
02:23From that point on, the real brakes take over almost entirely, not benefiting from carbon
02:28brake discs that handle intensity far better than the older steel brakes use decades ago.
02:33So back to the question, how does a plane actually stop?
02:35The honest answer is that it is never just one system.
02:38It is a carefully sequenced hand-off.
02:40Spoilers kill the dip first to make braking possible at all.
02:43Reverse thrust does the heavy lift at high speed, and wheel brakes finish the job as speed
02:47drops, all coordinated by computers faster than any pilot could manage manually.
02:51And that is exactly why an aircraft that fails to arm its spoilers for landing can run tendency
02:56long, no matter how hard the pilots break.
02:59Next time you dance, see if you dance for the outside order the system kick in.
03:03Spoilers then reverse thrust then the brakes.
03:04Let me know in the comments if you notice it.