A319 takeoff from ORD with "barking dogs" PTU
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- Опубликовано: 1 авг 2016
- United A319 takeoff from Chicago with the hydraulic pump "barking" noise during climbout. This noise usually occurs during taxi, and I never hear it during flight.
Наука
Наука
When the airbus spotted a 737 during takeoff
Bruh
That got me dying for 20 minutes straight💀
Underrated
??
funfact the A320 outsold the 737 so that barking is now basically the plane showing his middle finger when seeing a 737
This is the Power Transfer Unit; hydraulic pressurisation; this often happens when one engine is on after another or shutdown before another. So, it is usually heard on pushback or at the gate. This sound occurs on the Airbus A320 Family as far as I know, I don’t think it happens on any other aircraft.
You'll hear this sound on most commercial aircraft, including the Airbus A319. The sound will be heard during the approach until all landing gear has been retracted and also upon landing gear extension. This is usually during taxi right before take off and again during taxi right after landing.
I've flown on many commercial aircraft, and the only time I have heard this sound is on Airbus, and more often on the 319. It is heard at the gate and sometimes during taxi, but the 319s do it in flight too, on occasion. From what I have read, Boeing aircraft systems will only use such a PTU during a hydraulic failure to equalize pressure between the systems, but Airbus uses it for normal operation.
I'm not an engineer, but I find it so interesting. For what it's worth, an Internet source:
www.quora.com/What-makes-the-PTU-on-an-Airbus-A320-so-noisy-while-not-so-for-a-similar-twin-engine-Boeing-aircraft
Always wondered.. heard this everytime while parking at the gate..thanks
@@jeffdubea You hear it on every A320 family aircraft including A318, A319, and A321. I've flown 320s and 321s and have heard them on both. You wouldn't hear it in the cockpit, or seated directly in front or behind the engine because the PTU is located inside of the landing gear bay so you'd usually hear it sitting in between the wing.
You can also hear it on the A220 family too
Woof Woof woof WOOOAAAAAHHHHHH
We have a 3 year old Yorkie, he was resting on my lap while I was watching this video, and started barking at the barking dog sound from the aircraft.
lol
That's hilarious! It sometimes comes on when the landing gear is retracting, which was the case for this video.
Exactly. I spoke with an A321 pilot yesterday, he told me that we would hear the PTU while the gear was being retracted as it is part of the "green" system and putting the gear up would lower the hydraulic pressure
That was what I thought.
The video author really threw us a bone. I figured someone had an emotional support dog on board.
The barking dog is explained by captain joe on his channel. It's usually heard when engine 1 is shut down or started.
@@PilotBossify They were probably sent to taxi on one engine and started it up at the hold short point. The PTU would have been active already in order to run the brakes at the very least, but also flight controls. It was likely left on when starting the takeoff roll and compensated for a lack of pressure from the recently started engine.
"captain" joe
@@herrgris7654 LMAO
Captain joe?
Maybe colonel Trump?
The barking dog is also made when landing gear is retracted on take off, and when extended on final
This is the power transfer unit also known as the PTU. This helps the airplane transfer power. This sound can be heard when the engines shut down,startup or when the landing gear is retracting and it kind of sound like a barking dog.
When Airbus sees Boeing:
what?
is engine 2 even on??
this confused me
Ptu came up when the gear was retracted. Since the gear is operated by the green hyd system and the ptu transfers pressure between the green and yellow, I assume there was something unusual with the green system engine driven pump so that the ptu was required to raise the green sys pressure.
It's normal for the PTU to help the green system retract the gear. The flaps and gear use a lot of hydraulic pressure to operate, more than 500 psi, so the PTU helps with the drop in pressure during operation of these systems.
@@flightlevel3608*GPM is important too, realize that
Lol that mus'tve had a few dozen people freaked out.
I'm assuming it went on to help with the gear retraction
I've never heard them barking after take off.. in fact that was more of a howling 😂
Why would the ptu come on when both engines are producing the pressure?
I don't know enough about the engineering, but almost every time I have flown on an A320 family, I have heard it a bit before takeoff and rarely during climbout. I did hear it on an approach a few times as well.
The noise you are referring to, which is heard coming from the rear of the aircraft, is the result of the pressurization of the hydraulic system and the eventual equalization of the system on the aircraft. You'll hear this sound on most commercial aircraft, including the Airbus A319. The sound will be heard during the approach until all landing gear has been retracted and also upon landing gear extension. This is usually during taxi right before take off and again during taxi right after landing. This sound is very normal and you can be assured that when you hear it, the plane is functioning properly.
It´s the landing gear that is retracted
I never heard this on any other aircraft than Airbus, and I've flown in many Boeing and Embraer planes. It happens on the tarmac and long after the gear is retracted.
Fly Blue™ no
Mom I’m just trying to scrub my windows
Will E Coyote is chopping off the wings at flight lol! What a view!
The sound is usually heard on the A320, but I've flown the A330 many times and most of the time there's a barking dog sound. I've never heard it in flight though.
I've flown many times on A319,320,321 aircraft in that position in the cabin, and I have never heard the sound to this extent.
@@jeffdubea same
Some A340 200 & 300s might have a PTU; the switch for it appears on the cockpit overhead panel in some A340 200/300 flight manual illustrations. I've never seen an actual A340 cockpit with the switch though, or know of any barking dog sound on any A340. Maybe it's a mistake in the illustration. Seems strange though.
*Edit:* I _have_ heard a subtle camera zoom type sound after takeoff in some A340 videos though, including the A340 500. It's quiet, but it's definitely there. Maybe they have a PTU or maybe it's some other gadget
In flight, it can be heard just after takeoff and on final approach to help operate the flaps and gear.
Sounds like the cluster from Steven Universe
This happen even in take off because it need more hydraulic pressure the power transfer unit is not only for engine but the whole plane hydraulic parts!
Excellent take off well done.🦾
no EDP hydraulic pumps appear to have failed. as the landing gear uses pressure from the green hydraulic system, flowing the huge amount of fluid through the network of pipes, the pressure was not enough, and here is the PTU (Power transfer unit) which comes into operation for a short period of time. doing a little research on the internet, you can see the logic of the ptu
I think it is a normal condition, but I have flown many trips in these planes and never heard it operate for that duration.
@@jeffdubea semi normal, It should be checked the fluid quantity in the green hydraulic reservoir
@@mr.andrex228 Surprisingly, it's completely normal. The flaps and gear use a lot of hydraulic pressure, so the PTU will help during operation.
Flaps needing some hydraulic fluid.
0:50
Barking dogs are better than barking spiders! An airplane is the worst place to get a bad case of the farts! The farts spread fast inside the cabin.
Lmfao! They’re awful like shower farts
Hear this every time Edit: heard this 1 week ago
Hahahahahaha!!!!!! love song PTU...
Why are Airbuses hydraulics so noisy? I flew one out of ORD and it sounded identical.
HAHA really sounded like dogs :-D
I’ve heard it quite a few times and thought it sounded more like someone sawing something than dogs barking 😂
Caused by couple joining the mile high club.....often heard before ditching.
0:57 sound siren WW2
And sound grinding rearfeed on old bath😁
The sound is funny 🤣
That is terrifying
That didn’t just sound like the dog barking sound, that sounded like a dog was being murdered or something 😅
i have a quéstion. if you hear this sound after t/o, is it nỏmal HYD Transfering or unusual situaiton? it is not cool guy. haha
Joke apart can anyone tell me what is the reason of this sound ? As I get really scared during take off to hear this ....
Nothing to be scared of. It is called the "Power-Transfer-Unit" (PTU) and is supposed to transfer hydraulic pressure from one system to the other in case one of the engine-driven pumps were to fail. The reason it can be heared in the video comes down to the retraction of the landing gear, wich is done by the "left-hand-side" hydraulic system. The cylinders that raise the gear are huge and they actually extend to raise the gear. This causes a lot of the hydraulic oil to flow into the cylinders, causing the pressure in the system to drop momentarily. The PTU will activate whenever the differential pressure between the systems increases to more than 500 psi wich it did in the video. I hope that made sense :D
@@ogaibo1316 thank you so much. Respect 🙏
Woof woof woof woof woof woof woof woof woof wooooooooooahhhhhhhhhhhhhhhhhhhhhffff
Is the engine
The first time I hear it at takeoff
Jokes aside, it this one waspretty realistic !!!!!
that's not barking it's just the gear going up
I have flown the Airbus too many times to count. Always hear the "barking dog" on the tarmac. Never on a takeoff. I can see how people would think this is concerning.
I've only heard it on take-off and before landing, but apparently that's rarer I guess
@@madamebkrt It's not. The PTU will help the green system during landing gear operation and help the yellow system during flap operation. Devices like these use a ton of hydraulic pressure.
@@flightlevel3608 Thanks for the info.
Black Ops 2 Zombies intensifies :)
I heard it on a a320 of avianca every time I hear it on ground and take off and landing
Ah! Ah! Ah! Ah!
Was I the only one who though that was the gear-up sound?? Lol 😆
I though that was flap sound
I thought it was too 😂
That the noise the Airbus makes
Sometimes it sounds like someone sawing wood!
Sounds like a penguin😂😂
This is cruelty; somebody needs to feed that dog at once!!!🤣🤣
A319 when they see a kid
Why they sound like that?
0:55 when someone is trying to take the bone
That always happened to me
idk why but it reminds me of the zombies in call of duty
"when the likes are 777"
Dying robotic dog
That’s the
Adding gear
dobermann?
NICE video but… is the landing gear sound, a bit similar, in some models this system is louder but it has nothing to do with PTU ;)
It's normal but sounds like something's broken
The landing gear is dying!
Its a howler
That’s the
landing gear
You honestly just the get the same old 16 year old explaining what a PTU is in the comment section. Like bots. What I want to know was why did it need pressure equalisation in the first place? Hydraulic Fluid needing a top-up? One of the engines not keeping up pressure?
Finally a good response - I have flown in this aircraft almost weekly and this is the first time I heard the hydraulic pressure pump run for that long. This is also long after the gear retracted. I found it strange...
The zombie dogs are not happy..
Me: shut those dog us holy shit
Who the hell said putting the flaps up! Lmao
?
@reazyy if you listen carefully one guy asked what does that mean and he responds putting the flaps up
Doesn't sound real sound to me.
Matatan Ribirin Hs.😄.
very old plane
Hydraulic pressure. barking dogs....what a crock.
Yep dogs in the cage 🤣
Сlicкьаit! Fradulent youtube title. No barking dogs.
Undercarriage coming up, not the PTU.
it is the PTU evening out the pressure in the hydraulic systems because of a drop in pressure caused bu the landing gear coming up.
Lol 🤣🤣🤣🤣🤣🤣🤣🤣
boeing spotted
Cats
what
It shouldn’t sound during take off or landing. That means there’s a problem with engines
Not true.
That’s the landing gear 🤦🏼♂️ not PTU
It was the PTU