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

omar zain: Captain thank you for you for sparing time to do all of this useful explanations and you are doing it in very simple way easier than waht the have tought us in the college

I have one question that not everyone explained it probably
What is ground effect?! And what is the use of it in an aircraft??

kashi Patil: What happen when air enter in aeroplane

Jeremiah Chan: thanks for the knowledge

Muhammed Haneef: Captain, can an airplane brake at midair?????

Ale320: Hello Joe, i have a question: why i’ve seen some airplanes landed without the use of reverse ?

Saudi Airline: Cptn joe song name plzz 3:05 during your explanation no one answerd

Saudi Airline: End of the video background soundtrack name plzz

Manas Pandey: Captain Joe, can give me a little brief about how get engine works? Although, I have watched 100's of videos I still didn't understood how fuel is converted to electrical energy? How the propeller at the beginning rotates? And where is the motor in a jet engine? Captain I would really be thankful if u could please answer these Questions.

Anoop Kumar: Professors have explained this to me a 1000 times........never had i paid with such attention cozz its the captain itself explaining it to me........the one who actually applies it every time we land!!!!

Manjit Kaur: I am 13 years old and wants to be an A380 pilot

Kam Holley: Amazing accent!

SIDDHARTH SINGH: Can we use it in mid air

Manas Pandey: It's really a useful information captain. Now, Joe, can you explain how do FLAPS work and do pilots move down the flaps completely at the beginning or they move them when the plane is at full speed

syed hussain: hello i have a question in airbus a380 there are only 2 reverse thrust but in boeing 747 there are 4 reverse thrust

xxxxxGhostBoyxxxxx: I have always thought reverse thrust is the jet engine blade spinning towards the opposite direction. Turns out it's just a matter of redirecting the airflow towards the opposite.

old english clocks 1640 to 1700: Maybe the pilots could see behind with cameras. RE: the reverse thrust mode using the exhaust .... must utilise pretty heavy duty heat shields to prevent destruction of components in the path.

Mark Twain: Thanks, Captain Joe! Simple and thorough explanations, as always. Have the background music turned down a bit so it does not distract from your message.

Abhishek Tiwari: Noob question:
Why at all let the turbine suck air (which accelerates the plane forward) at touchdown at all? Why not just shut the turbines and perhaps use brakes + spoilers on wings to slow the aircraft down to a halt? It seems rather unnecessary that we use turbines to propel the plane forward AND using that, we try slowing the plane down.

Asher Leventhal: hi furii

Lai Yin Quan: When reverse thrust are applied, why does it make a very loud noise??

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