MYSTERIOUS BARKING SOUND on AIRBUS? All about the PTU explained by "Captain"Joe

[@jazzmills2847]

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)

[@sqv-i3b]

dont scare is normore and dont cried i here many this song i just set this song to my alarm clock on my android selphone to woke me every day

[@vp2871]

No one: Dogs in my neighborhood turning the PTU on

[@mjhancock6029]

Shit meme

[@MylaRolettoPingarelli]

@@mjhancock6029 shit reply

[@ErikHonanberg2049]

Lmao💀💀💀

[@stx_1]

​@@ErikHonanberg2049bro replied 3 years later💀

[@KAlpha09]

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!

[@cheese9293]

Swiss001: That's a whole another story Cap joe: That's a whole another video

[@РусланСамиков-л6н]

Swiss001: Good night!

[@giorgosk5532]

Nice one

[@specialopsdave]

@@Vanced01 Good midnight

[@crowxe]

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

[@gazza2933]

Rolls Royce Trent 700s. 👍

[@keemy_28]

Big example eurowings a330

[@Ayad719]

Yep when u land a a330 it's like a beautiful howling bird sound like taking some yogurt and eating it!

[@TheEmeraldMenOfficial]

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.

[@alexbalea6404]

Older ones yes

[@AMalas]

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

[@p_1749]

I know somw people that think that planes are simple. Only engines, wings and winglets and rudder. They are a lot more complicated.

[@AMalas]

@@p_1749 to be fair, I was 17 when I posted that comment, and I've felt this way since I was 5

[@nottsoserious]

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.

[@Melissa0774]

It sounds more like a saw to me.

[@MrRundas]

Mee too! It's like someone cutting the plane from his belly ahahah

[@JLE1177]

it sounds like a sound, it sees like a saw.

[@37VQV]

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.

[@JYMAHJAMES]

@@37VQV 😂😂

[@samanli-tw3id]

Melissa0774 sounds like a train to me

[@roberto123nogueira]

You are the best teaching captain. hugs from Brazil !!!

[@thenormanator9379]

He's not a captain, he's a first officer with the airline he flys for

[@flywithcaptainjoe]

Thank you very much, greetings to beautiful Brazil! Joe

[@arshianology7176]

Captain Joe i am finding this type of channel for ma y years bec i want to know about airplanes thxxxxxx

[@pierrefromwiisports2128]

TheNormanator I

[@everythingmax3623]

josé roberto nogueira he is a first officer or copilot

[@crispesongco9822]

Me: My neighbors dog at 3:00 am:

[@crispesongco9822]

Me and the boys!

[@jean-baptiste6479]

Usually it is the moment I stand up and say : "Don't worry, I am an aerospace engineer. This is the PTU".

[@RoterAdmiral]

..and I will sit there, asking myself 'Why do you pity me?'

[@styxfisher]

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？

[@mattierenton701]

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 !!

[@cavarshitagrawal7232]

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

[@flywithcaptainjoe]

Thanks :)

[@SirFloofy001]

XD

[@_entrxpy]

"granny shifting not double clutching like you should"

[@michaelking3327]

@@_entrxpy cool fast and furious comment

[@NoName-md5zb]

@@_entrxpy you never had me

[@yerrynata296]

it's one of my reason using a320..love to hear the barking dog during push back and parking.....

[@flywithcaptainjoe]

Great to hear :) Greetings Joe

[@mac_tire_aonair]

...during push back and barking maybe ;-)

[@mikalaybourn]

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!

[@flywithcaptainjoe]

All in good times :) Thanks! Joe

[@luckyeddy350]

Mika L. Ok. Now he has like 213k subscribers. That's a lot of people eh!

[@motormadness9975]

ALREADY OVER 400K NOW

[@KBow]

Motor Madness 600k+ now!

[@budguy21]

1.5 Million

[@justanotherintrovert1012]

does it mean something if I hear that noise in the middle of the flight?

[@kshitizsigdel423]

Yes. If you hear it in-flight then you MIGHT not live long enough to ask another question

[@JonatasAdoM]

Kshitiz Sigdel Or to recieve the asnwer.

[@avantgardethemighty6724]

Kshitiz Sigdel heard it short before landing on all my Turkish Airlines flights, I still live to talk about it 😋

[@kshitizsigdel423]

Avantgarde The Mighty Short before and landing and cruise are two completely different scenarios bud.

[@vxdanx455]

no....................... but if you hear in air for the landing then the rat turbine is being switch on

[@BaybieK]

Ah finally, an explanation for that horrible sound. Thanks!

[@JaxHolo]

Horrible i think it's hilarious

[@deezedayz]

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.

[@saqibmudabbar]

The best captain in the World!

[@flywithcaptainjoe]

Thank, but I´m still a copilot in real life :) Greetings Joe

[@dimitriymirovsky]

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!

[@saqibmudabbar]

Captain Joe With your knowledge you'll be an astronaut before you know it. Godspeed

[@varamitha8033]

Captain Joe are you Air Berlin pilot?

[@jgsh8062]

He used to, but air berlin closed down October 2017

[@psoon04286]

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 :- )

[@paddlehard5722]

Nice to have someone as open and as helpful to introduce us mortals into the magnificent aircraft technology. Thanks!

[@AdamRazaAvia]

Oh, that's why I hear a sound on the a320 I rode a few months back. Thank you for the information!

[@jaymuller]

Great stuff! How about one on how the plane is steered on the ground.

[@gabbenabbe]

jaymuller I totally agree! 😁

[@viperrtklol8181]

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!

[@jaymuller]

I heard there is another lever/wheel besides the yoke that they use also, along with the rudder pedals

[@Seadot777]

Viper they use nose wheel tillers

[@GewnStan]

To steer they have a seperate steering wheel to their left

[@roku_nine]

Thanks very much! Been wondering about the noise for ages!

[@flywithcaptainjoe]

My pleasure :)

[@taurus20077]

Who let the dogs out?

[@mikemac2888]

I should punch you for referencing that stupid, stupid song.

[@flywithcaptainjoe]

Haha, yes you could think of that song in that moment :) Greetings Joe

[@macieksoft]

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!

[@orangie84]

who let the pumps run.... ruff ruff ruff

[@pgtmr2713]

taurus20077 Didn't see your comment before I wrote mine :p

[@RafaLepo1996]

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!

[@neothaka]

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.

[@tbogun72]

Hey joe love your videos keep it up!

[@flywithcaptainjoe]

Thank you very much :) Greetings from Germany! Joe

[@gotthisusername]

Captain Joe, Can you please post a video about Cold and Dark Startup procedure in a simulator or a real aircraft?

[@slickstrings]

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.

[@Alex-ce6it]

"He was trying to start his chainsaw in the cargo compartment".... Epic.!! :) Another great video, thanks Captain!! All the best.

[@flywithcaptainjoe]

Me and my crew had such a laugh about it :)

[@Leofred2000]

You should have said "finally he found it after being there for over a week"😅 ...since Airbus apparently wants to scare their passengers anyway 😅😅

[@martintheiss743]

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.

[@LegionDevbest]

Why can't engines be started simultaneously?

[@ikarlhd1]

Unless you're easyjet! Their sequence is 1 then 2

[@macieksoft]

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.

[@dxb8086]

@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.

[@Kaakao]

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.

[@JPK90]

You only have so much power for the task.

[@tonytee8798]

I am a AIrcraft Mechanic and I love your teaching Cpt.Joe. Thank you

[@andheeid]

3:22 the ptu just kicked in, yo!

[@harezy]

We need that ram air turbine vid as that looks cool. Nice vid once again

[@flywithcaptainjoe]

Thanks Simon, yes I´m working on that already! Greetings Joe

[@glennwatson]

I think I prefer the myth the Airbus is powered by Dogs in a hamster wheel.

[@aliozanerbektas]

Damn even the hydraulics are RGB! xD

[@RRareGaming]

RYB

[@Covid-bv4hp]

Airbus CEO is a gamer

[@shubham.1172]

@@RRareGaming YGB

[@andypeck1972]

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!

[@FlorentCantat]

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!

[@justandy333]

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.)

[@maxsaviation9512]

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

[@Oliver-kn3bw]

Yesss my question was answered 👌✌✌

[@flywithcaptainjoe]

Oh great, happy to read that :) Greetings Joe

[@MickShoemaker17]

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?

[@mitchellschwartz6766]

+Apple and other fruit Statistically, your chances are lower than if you were driving your car. Pretty cool, imo.

[@balto2455]

swiss009 : 1 chance in 11 million to have a lethal plane accident

[@MickShoemaker17]

Cool,peeps.

[@twaynemalcolm8448]

I am happy I watched this now I know knowledge is power. Really thought something was wrong with the plane lol.

[@Javijimenezariza]

Just flew 6 times in 2 weeks in Airbus and I was getting more and more intrigued about that dog sound. Thanks!

[@TNX3000]

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!

[@flywithcaptainjoe]

Danke Dir Tobias und super Fragen für weitere Videos, habe ich mir notiert! Grüsse Joe

[@RDCST]

Please don't mock about the PTU, it is under big pressure!

[@yannisl8259]

Nice

[@tharsim]

Very well explained.

[@flywithcaptainjoe]

Thanks :) greetings Joe

[@dalaman4807]

What an amazingly comprehensive and clear explanation, much appreciated CJ.

[@juiceboyxd9310]

Whenever I hear it I always imagine someone sawing off the landing gear.

[@kevinsteele2773]

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

[@alanbrown397]

"What is it good for?" "Well, making dog noises is one thing that springs to mind."

[@kevinwestk7958]

I used to work for a lager American corporation in the UK testing hydraulic pumps, electric motor pumps and other electric /mechanical products for Airbus A320, 330,340,350, used to take pride in knowing these products worked and kept passengers safe, Boeing use similar equipment which i was involved with, still miss the job occasionally retired 3 years ago, but feel proud that i was part of that

[@netsky3]

You solved one of the mysteries I was carrying with me since ages. Thank you captain!

[@epiccars5440]

Cool

[@carterp2858]

That turbine thing looks awesome

[@semjj1]

Can you put the number on which section is it?

[@carterp2858]

SeanEzra Calasara what do you mean?

[@kedapofeng8993]

If you’re talking about the ram air turbine, it appears at 1:36

[@AS-yf4jr]

please explain how do you know where to taxi the plane after it has landed and do pilots ever make mistakes while doing it ?

[@Aeronaut1975]

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.

[@flywithcaptainjoe]

That video seems urgent, many request on doing that video :) I will work on that !

[@Colaholiker]

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...

[@SwirlingSoul]

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...)

[@tomstravels520]

Yes they do. BA 747 went on wrong taxiway in Johannesburg i think and wing struck a building

[@jamietube5856]

Please explain the flaps!

[@madjoemak]

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

[@JJ37_]

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.

[@steeltrap3800]

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.

[@madjoemak]

Steeltrap and guessmyname oh thank you!!! I meant to write that sorry I'll change that

[@steeltrap3800]

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

[@planetrob555]

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.

[@johnkollor]

Well you learn something new every day, I always assumed it was some system checking that the cargo/baggage loading doors are closed and correctly bolted. The more you know!

[@justinhamilton9699]

Hey joe i have a question, what do pilots do if both engines fail mid-flight?

[@EdPMur]

It would depends on why the engines shut down. But the APU can start the engines.

[@aneeshsankruth9115]

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.

[@TheOne-ps1hv]

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.

[@thenormanator9379]

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

[@southjerseysound7340]

They have a set service life.so they're changed long before they can break.

[@nrgzrbunny7775]

These pumps are designed specifically for this purpose, so they last a long time

[@mizzyroro]

Not just the A320 but all airbuses.

[@MagnumOpusSRT]

Green system powers nosewheel steering on some older aircraft. Changeover to yellow was about mid 2008. If an operator taxis out on left engine only, you will hear this noise if the yellow electric pump was not placed on, then PTU will not run.

[@dcftoxic]

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!!!!!!

[@patelbittu1593]

simply WOW

[@flywithcaptainjoe]

Thanks :) greetings Joe

[@yosoymyself6773]

*Sometimes everything you talk goes all above my head* #cantunderstand 😂😂😂

[@tmstheminecraftsurviver8141]

@Captain Joe, is there a gas maak in the toilet?? Always wanten tot ask that😂👍

[@tmstheminecraftsurviver8141]

*mask

[@sedrider]

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.

[@flywithcaptainjoe]

Yes there are to oxygen masks in every toilet :) Greetings Joe

[@tmstheminecraftsurviver8141]

Captain Joe and Dean Harrinauth Thanks!

[@Alexagrigorieff]

Do you mean there are two O2 masks in every lavatory? Are they for the members of mile high club, if the need arises?

[@ianwheeler8764]

Joe, you are the man! A very good, and simple explanation of the Airbus PTU. Thanks.

[@paulalex5986]

Captain , Your way of explaining is awesome. It's smooth and crisp. All the best captain....

[@patix9306]

I LOVE YOUR VIDEOS!

[@nitinsai9607]

I thought it was some kind of flap or rudder rubbing .. Yeah I'm an idiot I know that

[@felobatirmoheb4884]

Nah that sounds logical

[@safetyinstructor]

I heard this on Airbus A321-200

[@954aviation]

thats still the Airbus A320 family.

[@khaliefah]

I was wondering for years. Finally a good and in detail explanation by captain joe. My life is complete now.

[@JayGSalesAssist]

one of the best channels on KZbin...Thank you Captain joe. I fly a TON with Air Canada and have wondered many of these things.

[@OwenHeath]

I love your laugh 😂

[@flywithcaptainjoe]

And I love your comment :) Greetings Joe

[@OwenHeath]

Captain Joe Thankyou 🙂

[@mayankk_monuu]

love from India 🇮🇳 captain

[@prajwal_747]

mayank monu and reaserch team yo

[@LucianGarz-x9q]

Fake, The Airbus is an paid Actor.

[@zealman79]

Thoughts and prayers are fake too

[@SumanthVepa]

Awesome. I've been flying on a320s for twenty years and have always wondered what that sound was. I presumed they were the sounds of the cargo doors being closed. Thank you for the video. Extremely informative.

[@hugo112max]

Sumanth Vepa shouldn’t you have known this ?

[@SumanthVepa]

@@hugo112max To clarify. I've been flying *on* these aircraft as a *passenger*. :-)

[@FreeValen]

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!

[@jgurskey]

As a non pilot who loves to fly these are great informative and easy to follow videos.

[@GGV11]

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.

[@1spdpd]

Thank you, Capt. Joe, I fly on sim... MSFS 2020. I'm sure you have heard of this one. I fly the Fly By Wire A-230 and what a joy it is to fly, both hand and in autopilot. The most recent update to this plane (in the sim) has included this noise!!

[@guivallee]

I'm an engineer and i really liked your explanation, I didn't know that. Always learning. Thank you.

[@FgTt-l4h]

For me, who loves Captain Joe, I will continue to follow him.

[@alexchernavsky7717]

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.

[@filippopaganini6915]

Years of myself questioning this sound! Thank you very much!!!!

[@jaishetty8586]

I was appreciated when I explained your lecture on this topic. The credit goes to you of course. Thanks for this brilliant video.

[@mitchellschwartz6766]

I DID enjoy! Since the first time I was on an airbus 320 series bird, I had a deep love for that sound. I don't know why, I guess it was just the inner pilot in me! I am the same with the buzzsaw sound upon TO/GA power.

[@marcopoliziani5904]

The first time I heard that noise I was convinced that the measurements of the wings had been wrong, and that they were cutting one with a Saw ....🤦‍♂️😂 😂 Congratulations for the preparation on the subject and for the excellent explanations.👍🏻

[@davidcrossey]

Finally understand what this noise is! Thanks Captain Joe!!

[@arska6383]

So based on what I understood the A320 PTU is simply just like putting the yellow and green hydraulic systems into a arm wrestling contest. 2 reversible motor-pumps are connected to the same shaft but turning into opposite directions, and the one with more pressure, meaning more torque, wins. When there is enough torque difference to overcome the internal friction of the PTU a power transfer is made. No electronic control needed. Captain Joe, please correct me if I am wrong.

[@Tom-Lahaye]

This was a good explanation. I regularly fly with the A319 and A320, first I thought this noise came from setting the flaps, but looking to the wing the movement of the flaps didn't coincide with this sound. After that I thought it was the pumping of fuel to equalize the different tanks, and eventually the hydraulic system, but never new what it exactly was doing. So thanks for this explanation.

[@mattheal7328]

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 :)

[@Stevenzao]

Dear Captain Joe Your videos inspire me to pursue my childhood dream to become a pilot. I hope it’s not too late for me. I just turned 30 and still can’t afford flight school. :(

[@Korea_Aviation_Films]

I knew it was a hydraulic system sound, but I didn't know how it worked. Thanks to the captain's explanation, I could understand it well. Thank.

[@Heksu77]

Thanks, makes a lot of sense. I have always wondered what makes this sound.

[@yohannessulistyo4025]

It can be heard as well during: landing gear retracting or deploying, or when wheel brakes are applied. On older planes, during extreme turbulence and when the plane is constantly trimming. Then in one of my experience, when the flaps is extended. The scariest part is when I heard it continuously barking during landing gear extension (we were at approach), but then there was no loud wind noises to indicate the gear doors opening and a "thump", I was like "OMG, landing gear fail". But then, 5 seconds later I heard that comforting loud wind noises from below the floor. At this point I'm assuming that anything that requires hydraulic power, will trigger the noise. The older the system, the louder and the laggier the noise and effects. You can feel the "lag" too, they bark first and then the action commences. In Airbus A330, the PTU noise is different, but also give the same effect, you will heard a gas nozzle and a thump, then you'll feel the brakes decelerating the plane. Sitting in the middle section (overwing) is the best place if you want to hear these noises. But man, I feel that Airbus needs to insulate their planes better from all sorts of distracting mechanical noises.

[@Robfsumcc]

I'm a flight attendant and I get this question all the time from passengers on the A320 just before take off. Thank you so much for this.

[@dmr8914]

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 :)

[@colinadams6937]

This video is great...I have wondered what the heck that sound was whenever I fly on JetBlue here in the US, which has a mostly Airbus A320 fleet. I've never heard that on Boeing jets I've flown on. The first time I heard it, I thought something was very wrong with the plane. I mostly noticed it during pushback and engine startup. The explanation makes perfect sense.

[@grexursorum6006]

Hey Joe! I was in a A319 to Day and than on the way to the runway, there was this sound.. And I nearly didnt recognize it, but then in came to me .."OMG the Barking sound Captain Joe talked about". I was so happy and asked my wife if she can hear the dogs barking.. And she is like... Omg which dogs... I explained it and as the engines spul down at our destination she recognized it to :-) Thanks for that. You made my day... nearly 9 months after i watched this video :-)

[@leonardpage2260]

I was on a Jetblue flight, a woman had a small dog with her sitting a few rows behind me. When the plane started the pushback, the plane's hydraulics started making that barking noise, that little dog started barking along with it! I don't know what the dog and the plane were talking about, but they had an interesting conversation!

[@manjunatha8131]

Dear Joe, you are such a wonderful captain.

[@streptokokke1003]

In summer we had our two dogs in the cargo compartement. Their barking could easily be heard in the cabin (on ground). So it's not always the PTU. Sometimes it's Freddy and Jimmy.

[@dmitrychemankov3309]

Thank you, Joe! This question has long been bothering me. Now all is clarified!