What is reverse thrust? Explained by CAPTAIN JOE

INSTAGRAM FLYWITHCAPTAINJOE: https://goo.gl/TToDlg MY WEBSITE: https://goo.gl/KGTSWK Today´s question is another favorite of mine. What is reverse thrust and when do you use it? Okay, I´ll break it down for you to the absolute basics. Reverse thrust is used to slow down the aircraft on the runway after touchdown. There are three main components which slow down the airplane on the runway: Primary Braking with disc or carbon brakes similar to your car Secondary with reverse thrust Thrid with aerodynamical braking with the ground spoilers So we have two words in reverse thrust. “Reverse” cause the turbines output is being guided into the reverse direction and as you might not know we apply "thrust" in order to increase the braking action. So let´s look at this video to see what happens at touch-down. Here you can see engine number one of a Airbus A320. At touch-down these flaps open up, so called “reverser doors”. They act as guiding vanes in the mid section of the bypass-channel of the turbine and force the accelerated air of the fan to blow into the opposite direction. Now these reverser doors don´t open automatically at touch-down, no you lift up these little levers which will activate the hydraulic system to apply pressure to the actuator which then opens the reverser doors. Keeping the levers in this position only give you “Idle reverse”, but as soon as you move the levers to the aft position, the engine will spool up creating more thrust increasing the reverse output. The engines will increase thrust up to 70% which then resembles in “Full reverse thrust”. I know it´s odd to think that you would apply thrust again just after touch-down. You can definitely hear the difference between “Idle” and “full reverse thrust”, trust me :) Using the reversers significantly decrease the landing distance, varying between aircraft, weight and environmental factors. If you look at this great video of here, showing a Boeing 747 touching down and applying full reverse thrust you can clearly see how the water on the runway gets blown forwards. I actually experienced that myself landing on a snow covered runway, we applied full reverse thrust and you could literally see the snow blowing infront of the aircraft. So when do you use reverse thrust? Using “idle reverse” at touch-down is mandatory by many aircraft manufactures and airlines. First and far most to immediately decrease the aircrafts speed and to stabilize the aircrafts roll out plus to reduce brake usage. Landing on wet or snow contaminated runways using reverse thrust is absolutely vital to decelerate the aircraft and preventing it from skidding and keeping it in a straight line. Full reverse thrust is not permitted at some airports due to noise abendement procedures or at least restricted in between hours from here to then. Nevertheless pilots can use full reverse thrust when deemed necessary, but might have to state their decision in a report. Airplanes with wing mounted engines may only use full reverse thrust until slowing down to a specified speed, cause using the reverser below that speed could blow up loose gravel on the runway which could get sucked into the engine and damage the turbine. For example in an Airbus A320 you would have to reduce "full reverse thrust to idle reverse" at 70 knots, and retract the reverser at speeds below 40 knots. There are many different reverser types out there, but all work after the basic principle by forcing the air or even the exhaust into the opposite direction. So I hope I´ve answered another aviation related question for you. If you have a question that´s been on your mind, don´t hesitate to write me, therefore subscribe my channel, check out my website and spread the word! Farewell your Captain Joe Info: Fairly often you see executive jets using reverse thrust during taxi, to reduce break usage whilst rolling down sloping taxiways. Cause of their high mounted engines pilots don´t need to worry damaging the turbine due to gravel on the asphalt. And the well know MD80 with her rear mounted engines use to have a power back procedure, where they used reverse thrust to back out of a gate position. I´m not 100% if that procedure is still around? Maybe you know? To me that looks very dangerous. Equipment I use: Camera: http://amzn.to/2nEHPDM Microphone: http://amzn.to/2nff2oF Lights: http://amzn.to/2nEPGkU

Comments

Edward Kimutai: How does the life jacket below your seat on a plane inflate itself??

Jorge Hernández: Very interesting video, Captain Joe!

Mmlollol Tube: Quick tip - watch past the end of the video - there is usually an extra bit at the very end

Nafiz Ahamed: Captain Joe,why we can’t bring liquid on the airplane

adgh jifa: Can you move the plane in reverse with thrust reverse ??

mark m: They are called blocker doors and they are reversing the bypass air not the turbine gases, the md80 is reversing most all engine thrust.

Sam Stanfield: I'm not familiar with Reverse "Frust"

Parv Baid: Why does are ear 👂 pain when we land

Allan Kobanawa: Beautiful JAL 747!

Blake Alexander: When you become a pilot do you get to choose the airplane you fly or does the company assign you to an airplane?

Robert lowe: Damn music in the background drive you mad trying ti listen !

longlakeshore: I was once on a DC-9 which used reverse thrust to back away from the gate. It was over 30 years ago.

NVHSChadSheppard1: Jetblue, one pilot told me that they mainly use idle reverse. Full reverse I guess it depends on the runway and weather conditions

All about life & flight's: nice explained...... boeing A320 reverse thrust https://youtu.be/5ONDNbGtmzc

Watchdog 1021: I would like to be a pilot so I think his videos are interesting

Muhammad Bukht: Can you land a plane on auto pilot ?

longlakeshore: Does full reverse on the A320 only generate 70% thrust because only thrust from the fan is directed forward but the turbine exhaust isn't? I guess what I'm asking is whether full reverse is full throttle.

chirag jajoo: Hello Captain Joe
..I want know..if a pilot of Boeing can fly an Airbus

Vincent Planespotting: Another Great Video !! ; )

Shoeb Ansari: I want to ask that do plane can go reverse?
And during pushback, why don't the plane goes in the reverse direction by itself instead of using a pushback vehicle?
Plz answer my question as soon as possible.
Thank you

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