MYSTERIOUS BARKING SOUND on AIRBUS? All about the PTU explained by "Captain"Joe
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Dear Friends and Followers!
What is that barking sound coming from below the cabin floor as soon as we reach the gate position? Have you ever wondered what is going on in the cargo compartment where this very strange noise is coming from. Many people refer to this as the "Airbus Barking Dog Sound".
This strange barking sound emits from the PTU, the Power Transfer Unit which is a substantial part of the Airbus hydraulic system. I explain in further detail when the PTU is being operated and it´s purpose.
Now the Airbus A320 hydraulics consist of three independent system, named in colours, green, blue and yellow and one of their highest priorities is to pressure the actuators to move the flight controls.
the green system is powered by an engine driven hydraulic pump, engine number 1, so in flying direction the engine to your left hand side and the yellow system is powered by engine number 2 but can also be powered by an electric backup pump.
The blue system is powered by an electric pump only but isn´t associated with the PTU. It does, however, have its own unique backup mechanism, the Ram Air Turbine, but that´s a whole another video.
So imagine the PTU as a reversible motor pump located between the green and yellow systems. Hydraulic fluid from either system can drive the pump to pressurise the other hydraulic system. But the fluids only drive the pump so the remain isolated from each other, meaning they don´t mix
Each hydraulic system normally operates at 3000psi and if the difference between the green and yellow system exceeds 500psi, the system energises the PTU to pressurise the low system. In other words, the green or yellow hydraulic pump has failed and is being pressurised from the other system through the PTU.
What the video for more information :)
Thanks for your time and see you next thursday. Make sure to stop by my Instagram account at "flywithcaptainjoe" and subscribe my channel for more upcoming video.
All the best, Your "Captain" Joe
ONE MISTAKE IN VIDEO, you preferably start engine number 2 first and then engine number 1, in that sequence! Sorry about that ! - Наука та технологія
I remember 7 year old me being told by my sister that it was 'all the lonely dogs barking for attention in the luggage hold' (I cried for about an hour straight after)
No one:
Dogs in my neighborhood turning the PTU on
Shit meme
@@mjhancock6029 shit reply
Lmao💀💀💀
My car wiper sounds like that when overworked on a very rainy day.
Jokes apart, this is very useful information I’ve been looking for a long time. Thanks Capt Joe!
Me:
My neighbors dog at 3:00 am:
Me and the boys!
the sound always sounded purely mechanical, and I always love hearing all the mechanical sounds because it reminds me that I am not in a tin can with a rocket strapped to it, I am in a very complex engineered machine that has been deeply studied!
I usually thought the sound was from reverting the flaps to normal position from extended, though there are many sounds so that could be one of them
I know somw people that think that planes are simple. Only engines, wings and winglets and rudder. They are a lot more complicated.
@@p_1749 to be fair, I was 17 when I posted that comment, and I've felt this way since I was 5
My relative used to work as a software engineer for Airbus. It amazed me how complex just the communication software on the aircraft is. There are many modes of communication, and each one has different priority based on how critical the communication is. Each piece of software goes through severe scrutiny before even being greenlighted for an on-ground test with an aircraft. And even more for in-air testing.
Hey joe love your videos keep it up!
Thank you very much :) Greetings from Germany! Joe
Captain Joe, Can you please post a video about Cold and Dark Startup procedure in a simulator or a real aircraft?
G'day Joe!
A couple of years ago i was lucky enough to spend some time in a 747 simulator at qantas with an A380 instructor pilot. I was amazed to learn that even the 747 had so much control authority built into it that we were able to power down both engines on one side and still stay straight and level.
I know you must have quite a list of requests, but how about one on the impressive safety considerations/design aspects built into modern airliners.
Keep up the great work.
Swiss001: That's a whole another story
Cap joe: That's a whole another video
Swiss001: Good night!
Nice one
@@Vanced01 Good midnight
A330 makes a beautiful soft howling sound with certain changes in power setting, mostly during taxi. Would love to hear it closer and know why is it unique for A330
Rolls Royce Trent 700s. 👍
Big example eurowings a330
Yep when u land a a330 it's like a beautiful howling bird sound like taking some yogurt and eating it!
crowxe and the Dash-8 thrust reverser makes a very deep hum whenever taxiing (prop plane). It never comes up well in videos, but I always likened it to an evil cult trying to summon something.
Older ones yes
You are the best teaching captain.
hugs from Brazil !!!
He's not a captain, he's a first officer with the airline he flys for
Thank you very much, greetings to beautiful Brazil! Joe
Captain Joe i am finding this type of channel for ma y years bec i want to know about airplanes thxxxxxx
TheNormanator I
josé roberto nogueira he is a first officer or copilot
TODAY ITSELF I WAS REMEMBERING THAT MOMENT WHEN AFTER HEARING THIS SOUND ONE OF THE PASSENGER SAID PILOT IS SHIFTING THE GEAR LIKE A CAR..
NICE VIDEO
Thanks :)
XD
"granny shifting not double clutching like you should"
@@_entrxpy cool fast and furious comment
@@_entrxpy you never had me
Usually it is the moment I stand up and say : "Don't worry, I am an aerospace engineer. This is the PTU".
..and I will sit there, asking myself 'Why do you pity me?'
I heard the sound yesterday in an A321， even when the plane take off for 20 minutes and 20minutes before landing. Does it means anything goes wrong？
LoL I a few years ago I took great pleasure in going into lengths as to what the noise was as the person beside me got scared of the noise, in the end I think I bored them to death, funny though as they weren't scared after that LoL !!
Oh, that's why I hear a sound on the a320 I rode a few months back. Thank you for the information!
You deserves a whole lot more subscribers than just 93k. You are explaining the different things on an aircraft so good. All of the things is understandable, and explained so basic that you really can understand all of it. I just LOVE your videos! Keep up the good work, Joe!
All in good times :) Thanks! Joe
Mika L. Ok. Now he has like 213k subscribers. That's a lot of people eh!
ALREADY OVER 400K NOW
Motor Madness 600k+ now!
1.5 Million
It sounds more like a saw to me.
Mee too! It's like someone cutting the plane from his belly ahahah
it sounds like a sound, it sees like a saw.
I used to tell people that it's just the ground crew putting the finishing touches on the aircraft; or that its the ground crew sawing off the parts of the fuselage that are peeling off.
@@37VQV 😂😂
Melissa0774 sounds like a train to me
Nice to have someone as open and as helpful to introduce us mortals into the magnificent aircraft technology. Thanks!
Ah finally, an explanation for that horrible sound.
Thanks!
Horrible i think it's hilarious
The best captain in the World!
Thank, but I´m still a copilot in real life :) Greetings Joe
but u really catching faster, and the way u xplain much more simplier to understand for common people (without using bombastical jargon like other douche pilot)
:)))
anyway keep it up captain fantastic!
Captain Joe With your knowledge you'll be an astronaut before you know it. Godspeed
Captain Joe are you Air Berlin pilot?
He used to, but air berlin closed down October 2017
Thanks very much! Been wondering about the noise for ages!
My pleasure :)
these videos are great. I honestly got a bit anxious when hearing things like this, and the sound of the landing gear extending/retracting, thinking we had a hull breach. As they say, knowledge is power. it genuinely helps with flight anxiety if you know what most of sounds are, and what's causing them.
You know what's funny? I saw this video one year ago when I was a driver on an airport, only for general aviation. Now I work at the same airport but as a Marshall and ramp operator. Today a LAN a320 arrived, and while I was setting the chocks on the right hand side of the plane I could clearly hear the PTU operating. I didn't remember what it was, but I did know I had seen a video in this channel about that particular sound. Came back to refresh my memory!!! Thanks captain Joe!
Great stuff! How about one on how the plane is steered on the ground.
jaymuller I totally agree! 😁
jaymuller pretty sure that the pilot has foot pedals that move the rudder or the forwards gear module. This is how the aircraft would turn on the ground. While the aircraft is leaving the gate, there is a push vehicle that will push the plane back and steer towards the assigned taxiway. Hope this helped!
I heard there is another lever/wheel besides the yoke that they use also, along with the rudder pedals
Viper they use nose wheel tillers
To steer they have a seperate steering wheel to their left
Thanks! I have always wondered what that sound was. It took me off guard the first time I was on an Airbus A320, but the more that I have flown on them (as a passenger), the more I have gotten used to hearing this sound but I have still always wondered what the origin of the sound was until now.
What an amazingly comprehensive and clear explanation, much appreciated CJ.
I came to Hurghada on an Airbus A321 and I couldn't remember what this noise was, so I referred back to this. An excellent talk through!
it's one of my reason using a320..love to hear the barking dog during push back and parking.....
Great to hear :) Greetings Joe
...during push back and barking maybe ;-)
As a mechanic that works on all of the modern commercial airliners I must compliment you on your very clear and accurate explanation of this often asked but rather difficult to explain noise. Two thumbs up :- )
Just flew 6 times in 2 weeks in Airbus and I was getting more and more intrigued about that dog sound. Thanks!
Thank you, Joe! That was my number one aviation conundrum. It was hard asking anybody because I couldn’t find words to describe that sound.
"He was trying to start his chainsaw in the cargo compartment".... Epic.!! :)
Another great video, thanks Captain!!
All the best.
Me and my crew had such a laugh about it :)
You should have said "finally he found it after being there for over a week"😅 ...since Airbus apparently wants to scare their passengers anyway 😅😅
alex in another show he says that if you use sledgehammers on the ramp and one puts a dent into a part of the aircraft a certified mechanic needs to be summoned to see if this plane can be flown at the moment.
Who let the dogs out?
I should punch you for referencing that stupid, stupid song.
Haha, yes you could think of that song in that moment :) Greetings Joe
Airbus A320 unofficial QRH procedure to reduce annoying barking:
First check if there is PTU running. If it is start the second engine to get rid of it.
Then check if dogs are onboard. If they are simply use cargo hold extinguishers to get rid of them :-P
If they are still alive use manual pressurization to dump pressure and now you will really get rid of them!
who let the pumps run.... ruff ruff ruff
taurus20077 Didn't see your comment before I wrote mine :p
I have been wondering for so many years but never searched for an answer. And today’s the day, I finally know what this sound I’ve heard dozens of times it! Thank you!
I always wondered about the barking!!! Thanks for clearing this up for me 😁
I think I prefer the myth the Airbus is powered by Dogs in a hamster wheel.
Yesss my question was answered 👌✌✌
Oh great, happy to read that :) Greetings Joe
Captain Joe I know this could be a question already...but......what are the chances between 1-100 that a plane will crash or emergency land?
+Apple and other fruit Statistically, your chances are lower than if you were driving your car. Pretty cool, imo.
swiss009 : 1 chance in 11 million to have a lethal plane accident
Cool,peeps.
Great video! I'm been wondering about this question for YEARS!
Damn even the hydraulics are RGB! xD
RYB
Airbus CEO is a gamer
@@RRareGaming YGB
We need that ram air turbine vid as that looks cool. Nice vid once again
Thanks Simon, yes I´m working on that already! Greetings Joe
Very well explained.
Thanks :) greetings Joe
I always had that question, I knew it was a pressurization process on the hydraulics but did not understand what for until now!
Thanks Captain Joe, you rule!!!!!!
Richtig gute Videos, super Erklärungen und tolle Aufmachung! Immer weiter so, einer meiner absoluten Lieblingschannel!! Vielen Dank, Joe!
I LOVE YOUR VIDEOS!
Just flew on an A320 to Turin and heard this sound. Friends were like, What on earth is that strange sound? It is surprisingly loud.
I was able to give them an accurate answer and I looked like a genius in the process. Thanks Captain Joe!!
(Been waiting 2 years to show off that random bit of aviation knowledge! haha.)
Joe, you are the man! A very good, and simple explanation of the Airbus PTU. Thanks.
so happy to see your subscriber number rise and may it rise more!, love the videos. how you present your videos, makes me feel like i can become a pilot! with just how simple you explain it i look forward to your videos, keep up the brilliant work.
Sehr gut, endlich auch mal Infos die Avgeeks vielleicht noch nicht (so detailliert) wissen.
Mich würden noch die genauen Unterschiede zwischen Slats / Flaps und die verschiedenen Formen von Wingtips (Vor- und Nachteile) interessieren.
Und warum werden eigentlich alle Fälle des aerotoxischen Syndroms von der BFU gedeckelt?
Warum verpflichtet man die Hersteller nicht, auf Zapfluft zu verzichten?
Kompliment für den Channel!
Danke Dir Tobias und super Fragen für weitere Videos, habe ich mir notiert! Grüsse Joe
"What is it good for?"
"Well, making dog noises is one thing that springs to mind."
I was appreciated when I explained your lecture on this topic. The credit goes to you of course. Thanks for this brilliant video.
This video made my day..(.year, probably)! Finally. Been wandering about this sound, but none of the GA technicians I know could answer it. It really sounds as if someone is sawing the fuselage apart. Thanks, Joe.
This must be Airbus barking to Boeing
When there was a Boeing near Airbus 😂
Whenever I hear it I always imagine someone sawing off the landing gear.
I'm so happy now I understand that noise I always wondered. Never had the chance to ask a friendly pilot to explain me until I discovered this video, thank you Joe.for sharing these facts.
I was wondering for years. Finally a good and in detail explanation by captain joe. My life is complete now.
does it mean something if I hear that noise in the middle of the flight?
Yes. If you hear it in-flight then you MIGHT not live long enough to ask another question
Kshitiz Sigdel Or to recieve the asnwer.
Kshitiz Sigdel heard it short before landing on all my Turkish Airlines flights, I still live to talk about it 😋
Avantgarde The Mighty
Short before and landing and cruise are two completely different scenarios bud.
no....................... but if you hear in air for the landing then the rat turbine is being switch on
The phenomenon is know famously in Australia as the jerking airbus ,
It’s funny as hell watching people who don’t fly much panic when it starts
Finally understand what this noise is! Thanks Captain Joe!!
I've always wondered this. Thank you for posting!
I noticed that sound after pushback from my gate in Mexico City airport I flew to Phoenix yesterday on an American Airlines 20 year old A319
simply WOW
Thanks :) greetings Joe
These videos are great thank you. Captin Joe!!
Been wondering about the sound ever since my first time riding an A320. Finally found the answer after 10 years. Thanks for sharing this, Cap.
I love your laugh 😂
And I love your comment :) Greetings Joe
Captain Joe Thankyou 🙂
*Sometimes everything you talk goes all above my head*
#cantunderstand
😂😂😂
Endlich verständlich.) Hut ab für die super einfache Erklärung, danke!
Thanks Captain Joe!
Why can't engines be started simultaneously?
Unless you're easyjet! Their sequence is 1 then 2
One some AC they can, one other they can't. AFAIK on 747 you can start 2 engines simultanously. It's mostly about APU (how much bleed it gives) and starter bleed air demand. APU provides bleed air for engine starters. Sometimes APU bleed is not enough powerfull to start both engines.
@Ishan N
Wrong. There is no PTU functioning issue here. The PTU does only a self-test between Eng2 and Eng1-start to check the 500 psi green/yellow hydraulics pressure differential logic.
This is confirmed also under the section of Suppl. techniques FCOM 3, one engine taxi, where you must start and taxi on Eng1, to power the normal brakes and Nose Wheel Steering, without powering the PTU, and FCOM 1 under HYD, then PTU, as well.
Not enough bleed air pressure coming from the APU to spin up both engines at the same time. The Boeing 747 can start 2 of it's 4 engines at the same time.
You only have so much power for the task.
Very nice explained! When you make video of RAT?
Probably coming out in two weeks! Greetings Joe
You solved one of the mysteries I was carrying with me since ages. Thank you captain!
Cool
Thanks! Always wondered about this!
That turbine thing looks awesome
Can you put the number on which section is it?
SeanEzra Calasara what do you mean?
If you’re talking about the ram air turbine, it appears at 1:36
Super geniales Video! Hast du dein Wissen eigentlich alles aus der Flugschule oder musst du bei solch technischen Themen selbst forschen?
Vieles weiss ich noch von der Flugschule, doch diese Themen habe ich während meines Typeratings gelernt :) Grüsse Joe PS: Und ich finde als Pilot sollte man solche Dinge wissen :)
Great description with good detail!
Haha thanks for this I've wondered what this sound was for ages. Keep up the good work your videos are very educational
Please don't mock about the PTU, it is under big pressure!
Nice
Not just the A320 but all airbuses.
Wooo excelente Capi. Felicidades. Muy bien explicado
Thanks, makes a lot of sense. I have always wondered what makes this sound.
I heard this on Airbus A321-200
thats still the Airbus A320 family.
Hey joe i have a question, what do pilots do if both engines fail mid-flight?
It would depends on why the engines shut down. But the APU can start the engines.
There are tons of different procedures specific for different scenarios of engine failure. Modern engines are typically equipped with an autostart system that tries to start the engine back up from the bleed air from the other engine if it fails. If that fails the pilots will try to restart the engines from the bleed air from the apu, provided there is still fuel. But if both engines fail and there is still fuel, then the apu can power all of the aircraft's flight controls so that it can be safely landed with no problems, provided there is still enough altitude to coast down to the nearest airport. But if they run out of fuel in mid air there is something called as the RAT (Ram Air Turbine) that can be deployed, which looks like a small propeller, that spins up and powers the most important flight controls to help coast the aircraft down to the nearest airport.
Pretty late reply here but your answer is "Im starting the APU" (reference from sully) OR... put your gear down and land in the middle of the city and get your company sued.
I have just seen two of your videos and you've already clearly explained two mysteries: the runway numbers (I only knew what L and R stand for), and this dog sound lol. You're also very easy on the eye ;) Great stuff, I immediately subscribed to your channel. Keep it up! An Italian fan
I had this doubt since long! Thanks captain!!
please explain how do you know where to taxi the plane after it has landed and do pilots ever make mistakes while doing it ?
Taxiways are each given a letter of the alphabet, and gates have numbers on them, the flight crews also have a map on their charts (or built into the displays on modern aircraft) so a typical ATC instruction might be "Speedbird One, exit runway at Intersection Kilo, procceed to gate 34 via taxiway Golf, Juliet, Lima". That's just an example that I made up, but it gives you the gist.
That video seems urgent, many request on doing that video :) I will work on that !
Don't want to advertise for a certain airline here, but there is one, where pilot's comm systems and passenger entertainment are _united_ *cough, cough* ;-). While on the ground you can hear pilots and ground controllers talk to each other. I really wonder how it is possible to memorize the routes they tell the pilots so fast. :D
I listended to it for a while in Frankfurt, and especially Lufthansa pilots get "multilingual communication" with German greetings mixed in. That sounds very funny...
I've been listening to the ATC from Cork and dublin for a while, just because I was wondering about accents, ... just browsing around, but GEE, those language mixes can be really hard to understand! The more I realize HOW much a pilot knows,/needs to know/needs to have instant knowledge available of/ be capable of,....
I wonder if I still want to BE a pilot. (childs dream, but the calculating you guys do is beyond me to start with...)
Yes they do. BA 747 went on wrong taxiway in Johannesburg i think and wing struck a building
Wouldn't the constant on-off of the PTU eventually break it, if you were doing that with a water pump it wouldn't last that long
They have a set service life.so they're changed long before they can break.
These pumps are designed specifically for this purpose, so they last a long time
Years of myself questioning this sound! Thank you very much!!!!
Captain , Your way of explaining is awesome. It's smooth and crisp. All the best captain....
@Captain Joe, is there a gas maak in the toilet?? Always wanten tot ask that😂👍
*mask
They're o2 masks and yes they do have them installed in the lavs at least for the company i work for (united) after 9/11 they actually had them removed due to the threat of passengers opening the psu's and using them as a fuel for explosives since they were the old style o2 generators that produced heat. But we had a mod done that reinstalled a new style that doesnt get heat up and now all of uniteds fleet has o2 masks in all of there lavs.
Yes there are to oxygen masks in every toilet :) Greetings Joe
Captain Joe and Dean Harrinauth Thanks!
Do you mean there are two O2 masks in every lavatory? Are they for the members of mile high club, if the need arises?
Joe, great videos! When I boarded my flights over the past few days (A320 & A319), I noticed as we were walking up the stairs to board the plane a "clack, clack, clack, clack" sort of sound - seemed to be coming from the No.1 engine. The noise was very audible, and I'd say roughly happened about 5x a second. Do you know what this noise is? Thanks
The blades have a bit of movement to allow for temperature expansion/contraction etc and as the engine windmills (engine is off but the wind is turning the blades) them they rattle a bit.
SB Trains, Planes and Drives nice one, thanks for the answer!
Certain engines (like the CFM56 on Easyjet A319's) have 'Clappers' which are little stubs attached roughly halfway along the fans blade length it allows the blades to 'lock' in position when the engine is running at speed. Something to do with narrow chord blades fluttering. When the engine is idling they loosen off.
Dominic Bradley my answer not good enough then?
Yes :) That sound is worth another video :) I´ll see what I can do, and the explanations by the other comments here are very good too :) Greetings Joe
Cool! That Ram Air "last" system takes over in case ALL others fail, I assume. Very cool. So many redundant systems. Makes flying so safe.
one of the best channels on UA-cam...Thank you Captain joe. I fly a TON with Air Canada and have wondered many of these things.
Please explain the flaps!
Jamie Tube the flaps change the shape of the wing to give it more lift so the plane can fly slower. At high speeds you want leds lift or else the plane would go too high and maybe go vertical upward
Mad Joe Mak no partially wrong, it causes more lift for the airplane during low speeds when approaching the airport. And this is very important.
Ah, no, the flaps provide more lift at a given speed so you can fly more slowly, not more quickly. The rest of your comment is rather nonsensical, lol.
Steeltrap and guessmyname oh thank you!!! I meant to write that sorry I'll change that
No problem, I assumed you'd just made a simple mistake. Someone who speaks of altering the shape of the wing to generate more lift isn't likely to get it wrong, lol.
Cheers
love from India 🇮🇳 captain
mayank monu and reaserch team yo
Ive been a plane geek my whole life. Ive spent many many hours in the air and NEVER knew what this noise was until now!! Thanks Joe :)
Superb explanation!! Thank you, captain!
I thought it was some kind of flap or rudder rubbing
..
Yeah I'm an idiot I know that
Nah that sounds logical
None of what Captain Joe is saying is true.
Actually, there is a real dog barking on every Airbus machine sitting together with the pilot inside the cockpit while flying : the pilot feeding the dog and the dog barking if the pilot attempts to touch any control.
This is exactly what journalists wrote in the 80's when the Scarebus A320 came out with its lousy Die-By-Wire-Non-Coordinated-Sidesticks-Computers-Having-Priority-Over-Pilots-And-That-Cannot-Be-Overriden-Even-If-Bugging technology. They also wrote that Airbus could be flown by monkeys.
Bernard Ziegler, the man behind that technology - an also a criminal that should have been thrown in jail in the 60's for buzzing a French ski resort and knocking down a cable car and killing its occupants - is known for his stupid sayings :
- "Airbus' brain replaces pilots' one"
- "Even my concierge could fly the Airbus"
- "Airbus computers fix pilot errors"
- "As well as taxi drivers are not required to know what is under his engine hood, a pilot is not required to know what is on his Airbus"
Thank you very much for your great comment and that you´ve taken the time to watch my video and to write such a long comment !!! Greetings Joe
Lol, nice one
You forgot "Even my dog could fly an Airbus"
Canardeur why the hell are you calling Airbus "Scarebus" when they make the most widely used commercial aircraft the A320, Die by Wore non coordinated sidesticks and all that insult youre calling Airbus, youre obviously breaking Boeing and Airbus' good good relationship since you are a boeing fan and youre insulting Airbus, Boeing does that Fly-by-Wire thing too so youre insulting your own team anyway
Canardeur Bernard Zielger didnt really say those
Yes yes and more yes. I will watch every one of these. Thank you sir.
THANK YOU JOE. I have wondered what this noise is for years. Only ever heard it when pushing back but never used to hear it in older jets (ive been flying since 1975!) Never thought of it as a barking dog :)
Joe, thanks for the great explanation. Was always wondering about that sound!
Thanks x being a great Captain. Teaching all of the Aviation Industry. Blessings
Thank you!! I just flew twice this week for the first time and flew in an Airbus and had no clue what these noises were and it scared the heck out of me! It sounded like someone was sawing off one of the wings!!! I knew it was normal, but I was still curious. Thank you!
Thanks for clearing that up a little funny but embarrassing story to a Airbus taxied onto my stand when I was just starting out as a ramp agent I heard this noise and reported it to my team leader at the time never knew what it was until seeing this vid keep up the good work :)
I am a AIrcraft Mechanic and I love your teaching Cpt.Joe. Thank you