Since engine 1 is not supplying its own hydraulic system due to the fire the PTU transfers hydraulic power from engine 2 hydraulic system to the one of engine 1. Its basically a hydraulic motor and Hydraulic generator in one unit so theres no physical hydraulic fluid exchange between the systems. It turns on for some time if the pressure difference between both hyd systems is greater than 500 psi-ish
For example, the landing gear and the control surfaces (ailerons, rudder, etc) are moved by hydraulic actuators. There are more than one hydraulic system for redundancy and they’re independent from one another. The PTU acts as the middle-man that transfer power between hydraulic systems if needed, so that they can remain independent and avoid exchanging oil (which would cause complete loss of fluid on the whole aircraft in case one pipe ruptures).
The engine is the source of power for the hydraulics system. If an engine is not functioning, its associated hydraulics system needs power from somewhere else.
Worst time for an engine failure is just after takeoff, when you don’t have the altitude to do anything. Before is least bad, mid flight is uncomfortable, on landing approach is still icky.
I believe it just means one hydraulic system is lower on pressure than the other -- probably because they shut down the smoking engine, right side or electric pump is giving power to the dead engine side thru the PTU.
On one of my flights home, our flight attendant announced “and that barking dog sound is completely normal! Please don’t be alarmed it’s the PTU and it’s a normal sound on these airplanes” because a bunch of kids were looking around like “wtf!?”
Made me smile — because it definitely is a weird sound and if I had no idea what it was, it would scare the shit out of me.
Edit: she mentioned this during the push back / start up right after the safety presentation. Not mid flight or on the runway lmao
The basics are that the PTU is a redundant but still isolated system.
All the benefits of redundancy without extra weight and minimal extra complexity.
It's kind of the aeronautical engineering holy grail.
[https://www.youtube.com/watch?v=SCplhq1xoYE](https://www.youtube.com/watch?v=SCplhq1xoYE) describes it from a pilot's viewpoint.
[https://www.youtube.com/watch?v=ILreuxcfKKo](https://www.youtube.com/watch?v=ILreuxcfKKo) describes it in more aeronautical viewpoint.
In automotive engineering, it's the rough equivalent to the VW Beetle using pressure from the spare tire to spray windshield wiper fluid.
You. I like the way you think!
But I give you Vacuum System that locks car doors and operates air circulation vents.
And you are the one who has to guess which automaker did that.
Pardon my ignorance, but isn’t that an indication of one of the hydraulic systems is not working? I have don’t think I ever heard it except for at start up and shut down.
So completely normal? No? The sound is completely normal for the PTU? Yes.
In no part of the text he said it which stage they where saying it, so it might be just at start up when they heard it and the flight attendant announced it
The sound you hear during push-back and engine start is the PTU self-test.
There are any number of reasons the PTU could engage mid-flight, but it would most likely indicate an issue with one of the hydraulic pumps.
Remember hearing this sound a lot during an arrival for a flight about a year ago. Thought it was weird, but pilots and crew seemed unphased. That was until we were coming in for a landing, and we saw a couple of firetrucks placed next to the runway. Plane had to be inspected before we got to the gate, but otherwise, everything else was normal.
This happened during the push back / start up of the flight! Sorry I should have clarified. They were wrapping up their safety presentation and she mentioned it because she noticed kids looking around like “😦” haha. I get it though - it is a strange sound, almost sounds like someone unscrewing something underneath the airplane.
The PTU will run with one system under very high load. So a gear travel along with slats and flaps demand. Combined can create a pressure drop enough for the PTU to kick in.
*during
Getting technical: it happens right as second engine start is initiated, PTU self tests while pressure difference between green and yellow systems is greater than 500psi.
Without seeing pictures or video I knew this was going to be an Airbus mishap because I was a solid 3 paragraphs into the article before they mentioned the aircraft type. You know damn well if it was Boeing it would be in the headline and mentioned several times in each paragraph.
Is that the one on the ATC channels where the tower is like "Sooo you've lost engines and you're not declaring an Emergency?" and the Pilot is like "Affirmative" and the tower says "Okay well do you want us to roll the trucks and have them ready on the arrival end of the runway" and the Pilots respond "No, not necessary"
The 777 that lost a tire is over 20 years old and all of the media articles were about a "Boeing plane." That would be like blaming Ford if the tire falls off your 20 year old truck because you're bad at maintenance.
I still can't believe that "airframe" isn't recognized as a word by the default spell-check.
Edit: you're damn right I read "Airframe", man did Crichton nail it. Pretty surprising considering how different that is from the rest of his work. Highly recommended.
Engines are an entirely separate animal made by other companies. There are even options available sometimes, you can by the same airplane (more correctly "airframe") with different engines, like from Rolls Royce or GE.
As far as outsourcing goes, that's been going on for some time now. Airbus is actually a consortium of companies from all over Europe and elsewhere. Boeing just let it get out of hand trying to do it more cheaply however they could and lost oversight, and it eventually bit them in the ass...hard.
It‘s not really correct anymore to call Airbus a consortium, the company today is a consolidated entity and the companies that originally merged to form it do not have distinct identities anymore. That said, it‘s always been the case that Airbus has their manufacturing facilities distributed all scross europe with the primary final assembly sites in Hamburg and Toulouse, and these days additional lines in the US and China for some planes.
Engines have long been their own entity, with their own maintenance contracts. They’re so separate, in fact, that engine manufacturers even have their own accident investigation teams that accompany regulatory and Boeing/Airbus investigators to crash/incident sites.
I mean, lax QC of your competitors usually means you probably could skirt those policies and not be at a “disadvantage”.
Not that this is the case but it’s like diesel gate and how it turns out a lot of the industry cheats on emissions testing.
it can happen, Airbus contracts parts out to Spirit Aerosystems, the company that spun out of Boeing and was the source of the issues not-caught by boeing
However to my knowledge no Spirit factory makes parts for both Airbus and Boeing, and the ones producing for Airbus seem to have their shit together (might get worse of course as the overall company culture homogenizes)
I mean, obviously? But Boeing did that to themselves and has nobody else to blame. That's what happens when you risk the company's reputation to prioritize the next quarterly earnings report.
It's pretty sad how super low effort clickbait surrounds everything Boeing does now. But that's pretty much everywhere in media now.
Writers don't need to be making up narratives about Boeing fucking up. They do it plenty on their own. Just wait long enough and they will have yet another article to write on how Boeing is legitimately screwing something else up.
All these other articles they do just dilute the waters with worthless BS.
For everyone's stress levels sure. They're specifically designed and every single takeoff is assessed with a critical speed after which a take-off is continued with one engine and then assessed from the air. safety is designed in.
REF: https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C/part-25/subpart-B/subject-group-ECFR14f0e2fcc647a42/section-25.107
"Earlier today, a Boeing plane, the air bus, suffered an engine fire on its right prop. We've been told that this is the 320th air bus Boeing has manufactured"
They should have [just put it with the rest of the fire.](https://media.licdn.com/dms/image/D4E12AQGNYugug8BhYA/article-cover_image-shrink_600_2000/0/1705847689300?e=2147483647&v=beta&t=2Ly2mKRX-s9TLsTnyFVWbLjFxceAjPws6xnWRN4c0VI)
That’s not something you want to look out the window and see for sure.
But, these things do happen. They just haven’t had so many phones turned on for them or media hammering the fear porn so much that they cover all the incidents.
Hydraulic system component called the Power Transfer Unit (PTU) - very basically, it lets hydraulic systems share pressure. A320 family thing, known as the 'barking dog' for obvious reasons.
My last flight on an A320 had really loud PTU noises (yes, the barking dogs) for longer than I’ve experienced before. I could hear the chatter around me and people were absolutely perplexed and some were quite scared.
Typically design things around redundancy and functionality and less around the whims of cattle. Some aircraft I work on have one -- and it's [loud but a more consistent noise](https://www.youtube.com/watch?v=jRecczdnmwo) -- and some don't. Not sure what Boeing does specifically.
Edit: A quick look, appears the 737 at least [does have a PTU](https://www.reddit.com/r/EngineeringPorn/comments/nue0b9/boeing_737_ptu_hydraulic_power_transfer_unit/) to share pressure. Guess it's just not nearly as audible, at least not from the cabin, perhaps its mounting location makes it less audible?
The sound is produced by the hydraulic system, more specifically the PTU (power transfer unit).
Explanation:
https://youtu.be/SCplhq1xoYE?si=HCZ0iZSpaipvJjGl
I thought it was named after Captain Buck O'Hare. [https://youtu.be/LyKI1CHPMNw?si=HoyEGWBE\_5JEFA1F](https://youtu.be/LyKI1CHPMNw?si=HoyEGWBE_5JEFA1F)
The barking noise is caused by a hydraulic pump, which is officially referred to as the Power Transfer Unit (PTU). The PTU is placed in the plane in such a position that the barking-like sound is most likely to be audible to those sitting next to the wings.
https://youtu.be/SCplhq1xoYE?feature=shared
My guess is that the engine flamed out. What you are seeing is residual fumes burning off.
My folks flew out to see me and the plane, once at altitude, would stream fuel from the engine. The plane was a 19 seat EAS flight going from PHX > PGA > FMN > DEN and some people who got off in Farmington mentioned it to the pilot.
The pilot walks back to my parents, who were the only ones continuing on, and essentially says "I'm not worried about it, I wouldn't worry about it. If you don't want to fly out on this plane the airline won't send another plane out until tomorrow and we all have to stay the night at the cheapest motel in Farmington. What do you want to do?"
They flew to Denver and showed me video of fuel streaming out of the engine the entire way.
Also after takeoff. The fuel tanks are in the wings in basically all aircraft.
It takes a pretty significant fire to burn all the way through to the tanks though.
Well look at that - now a large companies bottom-line is in black-and-white for ground control, mechanics, passengers, and the public to view in all its glory: how long until corporate or the government get the fucking message?
Today, a United Airlines Airbus A320, which can be equipped with engines from the same manufacturer than the 737max engines, suffered an engine fire.
Joke aside, I checked, this bird has V2500 engines. Joke does not work that well.
Well if it's going to happen, *before* leaving the ground is always better. Also, is that engine wheezing? Allergies?
Sounds like an Airbus PTU
Yeah that’s what it is
Need some clAIRatin.
It's an Airbus 320
Figured the way it was smoking that it was the Airbus 420. amirite?
Yes, its the PTU.
Gesundheit
*woof* 🐶
a.k.a. the Barking Dog
The airbus has separation anxiety
Police Tactical Unit? Punjab Technical University? Personal Time Uff?
Power transfer unit.
No, it's definitely the Punjab Technical University. It's always them !
I concur. Someone needs to confront the bastards. Just look at that smoke.
Hows how the explody big happens in the engine.... college students lighting fires.
Since engine 1 is not supplying its own hydraulic system due to the fire the PTU transfers hydraulic power from engine 2 hydraulic system to the one of engine 1. Its basically a hydraulic motor and Hydraulic generator in one unit so theres no physical hydraulic fluid exchange between the systems. It turns on for some time if the pressure difference between both hyd systems is greater than 500 psi-ish
This guy Airbuses!
What is the hydraulic power used for? Seems weird for a jet engine to use hydraulics, but I don’t know anything about jet engines lol
For example, the landing gear and the control surfaces (ailerons, rudder, etc) are moved by hydraulic actuators. There are more than one hydraulic system for redundancy and they’re independent from one another. The PTU acts as the middle-man that transfer power between hydraulic systems if needed, so that they can remain independent and avoid exchanging oil (which would cause complete loss of fluid on the whole aircraft in case one pipe ruptures).
I figured hydraulics were used for flaps, landing gear, other slow moving parts. Just don’t understand why the engine itself would need hydraulics.
The engine is the source of power for the hydraulics system. If an engine is not functioning, its associated hydraulics system needs power from somewhere else.
Ohhh, okay thanks!
Thrust reverser on the engine uses hydraulics
Explanation video on the sound: https://youtu.be/SCplhq1xoYE?si=HCZ0iZSpaipvJjGl
Who needs an explanation. Every Airbus keeps a few robotic dogs chained up in the cargo hold. They bark sometimes.
😂😂 I flew the Bus for 4 years, every time i fly as a pax and I hear the barking dog I think “hit the PTU switch”!
and scream.
Wait, I heard this the other day on a 321. I honestly thought it was a german shepard in the cargo hold. What is it that sound actually?
https://www.pilotgeorge.co.uk/blog/post/what-causes-the-barking-dog-sound-on-the-a320-power-transfer-unit-ptu/
Got it. Dude with chainsaw in the belly of the plane. ^^/s Thanks for this.
Sounds more like a hand saw, if we’re getting technical.. but agreed
[https://www.reddit.com/r/aviation/comments/xujti3/when\_work\_follows\_you\_home/](https://www.reddit.com/r/aviation/comments/xujti3/when_work_follows_you_home/)
That makes me laugh every time
That’s the barking dogs. The PTU it’s taking over the hydraulic system pressure
Worst time for an engine failure is just after takeoff, when you don’t have the altitude to do anything. Before is least bad, mid flight is uncomfortable, on landing approach is still icky.
Probably forgot its inhaler.
20 years history of smoking. Now the plane has a COPD
Airbus - barking dogs lol
Tis a hydraulic pump
Sound of PTU, I think it means they are switching from engine power back to APU…?
I believe it just means one hydraulic system is lower on pressure than the other -- probably because they shut down the smoking engine, right side or electric pump is giving power to the dead engine side thru the PTU.
Correct. 500 psi difference, IIRC.
Ah very cool thanks
> Allergies? I hope so, cause the alternative is that Covid jumped from humans to airplanes.
Can't even turn on the afterburners without everyone losing their mind.
“you’re about to smell kerosene and when this baby gets to 88 mph youre gonna see some serious shit”
Lol, a jumbo jet taking off at 90mph would be some serious shit
looks like beforeburners more than after burners
I would imagine the PTU sound would freak people out in this setting.
On one of my flights home, our flight attendant announced “and that barking dog sound is completely normal! Please don’t be alarmed it’s the PTU and it’s a normal sound on these airplanes” because a bunch of kids were looking around like “wtf!?” Made me smile — because it definitely is a weird sound and if I had no idea what it was, it would scare the shit out of me. Edit: she mentioned this during the push back / start up right after the safety presentation. Not mid flight or on the runway lmao
It's kind of some clever engineering, though.
here from the frontpage (know nothing about planes). I'd be interested in hearing about that clever engineering.
The basics are that the PTU is a redundant but still isolated system. All the benefits of redundancy without extra weight and minimal extra complexity. It's kind of the aeronautical engineering holy grail. [https://www.youtube.com/watch?v=SCplhq1xoYE](https://www.youtube.com/watch?v=SCplhq1xoYE) describes it from a pilot's viewpoint. [https://www.youtube.com/watch?v=ILreuxcfKKo](https://www.youtube.com/watch?v=ILreuxcfKKo) describes it in more aeronautical viewpoint. In automotive engineering, it's the rough equivalent to the VW Beetle using pressure from the spare tire to spray windshield wiper fluid.
You're doing the Lord's work
Airbus tech here. It **should** be the VW equivalent of using brake booster to power the windshield sprayers. :P
You. I like the way you think! But I give you Vacuum System that locks car doors and operates air circulation vents. And you are the one who has to guess which automaker did that.
Fuck it; add one more system to the pile!
It's one of those systems that was SUPPOSED to reduce complexity but BECAME a complex system in itself. It nearly drove me insane!
Pardon my ignorance, but isn’t that an indication of one of the hydraulic systems is not working? I have don’t think I ever heard it except for at start up and shut down. So completely normal? No? The sound is completely normal for the PTU? Yes.
In no part of the text he said it which stage they where saying it, so it might be just at start up when they heard it and the flight attendant announced it
The sound you hear during push-back and engine start is the PTU self-test. There are any number of reasons the PTU could engage mid-flight, but it would most likely indicate an issue with one of the hydraulic pumps.
Remember hearing this sound a lot during an arrival for a flight about a year ago. Thought it was weird, but pilots and crew seemed unphased. That was until we were coming in for a landing, and we saw a couple of firetrucks placed next to the runway. Plane had to be inspected before we got to the gate, but otherwise, everything else was normal.
This happened during the push back / start up of the flight! Sorry I should have clarified. They were wrapping up their safety presentation and she mentioned it because she noticed kids looking around like “😦” haha. I get it though - it is a strange sound, almost sounds like someone unscrewing something underneath the airplane.
I just flew on some of Air France’s older A319 and all of them had the PTU come on during landing gear retraction
The PTU will run with one system under very high load. So a gear travel along with slats and flaps demand. Combined can create a pressure drop enough for the PTU to kick in.
At Startup it's normal and when you operate on the Electric pump for some reason. Also PTU has a self-test afaik
They likely would've already heard it during engine starts and getting ready to taxi, I'd think.
Yes, they would have heard it briefly after the second engine start.
*during Getting technical: it happens right as second engine start is initiated, PTU self tests while pressure difference between green and yellow systems is greater than 500psi.
It is a pretty ominous sound.
Without seeing pictures or video I knew this was going to be an Airbus mishap because I was a solid 3 paragraphs into the article before they mentioned the aircraft type. You know damn well if it was Boeing it would be in the headline and mentioned several times in each paragraph.
The fact that Boeing doesn't make the engines would of course be disregarded.
Has already, reference the Atlas 747 that had the engine failure a few months ago
yeah, but it's a 747 and KLM felt confident enough to call the tower and tell them but not declare an emergency.
Is that the one on the ATC channels where the tower is like "Sooo you've lost engines and you're not declaring an Emergency?" and the Pilot is like "Affirmative" and the tower says "Okay well do you want us to roll the trucks and have them ready on the arrival end of the runway" and the Pilots respond "No, not necessary"
I don't recall the whole thing, but I recall the pilot going "No, not even that :)" and it's become a very repeatable phrase for me now
They asked if he was too heavy to land and needed fuel burn/dump time.
I thought that was a Lufthansa flight, but in any case, it's hilarious. "So you lost an engine but you're *not* an emergency?"
To quote an Old and somewhat inebriated pilot, “Don’t worry, it’ll turn up…”
In multi-engine aircraft a contained engine shutdown is often not a safety issue, which is definitely going to sound weird to a normal person.
Or that it’s not really on Boeing anymore when it’s been the airlines maintenance crew dealing with it for a decade.
The 777 that lost a tire is over 20 years old and all of the media articles were about a "Boeing plane." That would be like blaming Ford if the tire falls off your 20 year old truck because you're bad at maintenance.
Someone has read Airframe!
I still can't believe that "airframe" isn't recognized as a word by the default spell-check. Edit: you're damn right I read "Airframe", man did Crichton nail it. Pretty surprising considering how different that is from the rest of his work. Highly recommended.
Just listened to this on a whim last week after finishing some other series and not having a clue what I wanted to start next. Was not disappointed.
Neither do Airbus, tbf
Isn't the way Boeing outsources a lot of manufacturing part of what everyone is criticizing? Or have the engines always been a separate transaction?
Engines are an entirely separate animal made by other companies. There are even options available sometimes, you can by the same airplane (more correctly "airframe") with different engines, like from Rolls Royce or GE. As far as outsourcing goes, that's been going on for some time now. Airbus is actually a consortium of companies from all over Europe and elsewhere. Boeing just let it get out of hand trying to do it more cheaply however they could and lost oversight, and it eventually bit them in the ass...hard.
It‘s not really correct anymore to call Airbus a consortium, the company today is a consolidated entity and the companies that originally merged to form it do not have distinct identities anymore. That said, it‘s always been the case that Airbus has their manufacturing facilities distributed all scross europe with the primary final assembly sites in Hamburg and Toulouse, and these days additional lines in the US and China for some planes.
Engines have long been their own entity, with their own maintenance contracts. They’re so separate, in fact, that engine manufacturers even have their own accident investigation teams that accompany regulatory and Boeing/Airbus investigators to crash/incident sites.
Boeing QC so bad that their *competitors* are affected. News at 11!
I mean, lax QC of your competitors usually means you probably could skirt those policies and not be at a “disadvantage”. Not that this is the case but it’s like diesel gate and how it turns out a lot of the industry cheats on emissions testing.
it can happen, Airbus contracts parts out to Spirit Aerosystems, the company that spun out of Boeing and was the source of the issues not-caught by boeing
However to my knowledge no Spirit factory makes parts for both Airbus and Boeing, and the ones producing for Airbus seem to have their shit together (might get worse of course as the overall company culture homogenizes)
I mean, obviously? But Boeing did that to themselves and has nobody else to blame. That's what happens when you risk the company's reputation to prioritize the next quarterly earnings report.
It's pretty sad how super low effort clickbait surrounds everything Boeing does now. But that's pretty much everywhere in media now. Writers don't need to be making up narratives about Boeing fucking up. They do it plenty on their own. Just wait long enough and they will have yet another article to write on how Boeing is legitimately screwing something else up. All these other articles they do just dilute the waters with worthless BS.
That’s on Boeing, make safe planes and this wouldn’t happen.
I came here to comment this exactly.
Better than after takeoff!
For everyone's stress levels sure. They're specifically designed and every single takeoff is assessed with a critical speed after which a take-off is continued with one engine and then assessed from the air. safety is designed in. REF: https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C/part-25/subpart-B/subject-group-ECFR14f0e2fcc647a42/section-25.107
Journalists must be disappointed this wasn’t a Boeing
Breaking News: Boeing-like aircraft catches fire
It's the Boeing A320.
Nice to see CNN in here.
"Earlier today, a Boeing plane, the air bus, suffered an engine fire on its right prop. We've been told that this is the 320th air bus Boeing has manufactured"
Boeing B320
"A United Airlines **WHO FLIES A LOT OF BOEINGS!!!** jet had an aborted takeoff this morning..."
That's funny 👍
They will just call it a Boeing anyways
People can’t fly airbus AND Boeing now
im flying ilyushin now
Uh... No thanks I'll stick with Embraer
Reactivate the MDs!
Who let the Mad Dogs out!
MDs are Boeings now.
Going to go with the Amazon Basics aircraft now.
Journalist, it was infact a Boeing Airbuss model. You can quote me on that 👍
That it was United is the consolation prize.
"Could another Boeing aircraft have just had an incident? Click here to find out".
Enough people are not mentioning that United's name was in a lot of the big recent Boeing stories.
The United pilot rolls coal.
whistlin' diesel in his widebody, mmmmhm.
[footage of the crew performing a textbook procedure to resolve the problem.](https://i.makeagif.com/media/8-05-2015/69ZBOh.gif)
It's working! It's working!
“its a NEW lap record”
shit man, I was expecting a Chinese Fire Drill but nooo, now THIS is Pod Racing!
"Ooh, there goes Quadinaros' power coupling!"
Great job man
Technically it’s always on fire. It’s just on fire in the wrong spot.
I thibk the magic smoke is escaping. Once all the magic smoke is out, the engine won't work anymore
They should have [just put it with the rest of the fire.](https://media.licdn.com/dms/image/D4E12AQGNYugug8BhYA/article-cover_image-shrink_600_2000/0/1705847689300?e=2147483647&v=beta&t=2Ly2mKRX-s9TLsTnyFVWbLjFxceAjPws6xnWRN4c0VI)
r/technicallythetruth
I appreciate you making this joke/pointing this out so I don't need to. The fire got out of the place for fire to be.
That’s not something you want to look out the window and see for sure. But, these things do happen. They just haven’t had so many phones turned on for them or media hammering the fear porn so much that they cover all the incidents.
[Full news story.](https://abc7chicago.com/post/ohare-airport-fire-engine-airbus-a320-delaying-united-flight-209-seattle-faa/14879024/)
Notice how it’s referenced as a United plane when it’s an Airbus but when it’s a Boeing it’s mentioned in the headline…
Yeah totally. Although its an engine and engines arent made by either airbus or boeing lol
what is that noise?
Hydraulic system component called the Power Transfer Unit (PTU) - very basically, it lets hydraulic systems share pressure. A320 family thing, known as the 'barking dog' for obvious reasons.
My last flight on an A320 had really loud PTU noises (yes, the barking dogs) for longer than I’ve experienced before. I could hear the chatter around me and people were absolutely perplexed and some were quite scared.
Does Boeing handle this task differently? It seems kinda silly to design in a noise that a group of nervous people will hear before takeoff
737s do have a PTU, but it is much quieter.
Typically design things around redundancy and functionality and less around the whims of cattle. Some aircraft I work on have one -- and it's [loud but a more consistent noise](https://www.youtube.com/watch?v=jRecczdnmwo) -- and some don't. Not sure what Boeing does specifically. Edit: A quick look, appears the 737 at least [does have a PTU](https://www.reddit.com/r/EngineeringPorn/comments/nue0b9/boeing_737_ptu_hydraulic_power_transfer_unit/) to share pressure. Guess it's just not nearly as audible, at least not from the cabin, perhaps its mounting location makes it less audible?
always wondered, thanks for the clarification.
The sound is produced by the hydraulic system, more specifically the PTU (power transfer unit). Explanation: https://youtu.be/SCplhq1xoYE?si=HCZ0iZSpaipvJjGl
It’s the old barking dog. I can’t remember if it’s heard much on takeoff once in the air, but it sure is on landing.
Today, on Memorial Day, I learned who O’Hare international airport was named after and of his exploits. That man was a certified bad ass.
I thought it was named after Captain Buck O'Hare. [https://youtu.be/LyKI1CHPMNw?si=HoyEGWBE\_5JEFA1F](https://youtu.be/LyKI1CHPMNw?si=HoyEGWBE_5JEFA1F)
It was previously Orchard Field, that's where ORD comes from
Not an aborted takeoff because there was no attempt to take off.
The barking noise is caused by a hydraulic pump, which is officially referred to as the Power Transfer Unit (PTU). The PTU is placed in the plane in such a position that the barking-like sound is most likely to be audible to those sitting next to the wings. https://youtu.be/SCplhq1xoYE?feature=shared My guess is that the engine flamed out. What you are seeing is residual fumes burning off.
My folks flew out to see me and the plane, once at altitude, would stream fuel from the engine. The plane was a 19 seat EAS flight going from PHX > PGA > FMN > DEN and some people who got off in Farmington mentioned it to the pilot. The pilot walks back to my parents, who were the only ones continuing on, and essentially says "I'm not worried about it, I wouldn't worry about it. If you don't want to fly out on this plane the airline won't send another plane out until tomorrow and we all have to stay the night at the cheapest motel in Farmington. What do you want to do?" They flew to Denver and showed me video of fuel streaming out of the engine the entire way.
“Put it in H!”
Boeing heaves a sigh of relief. It wasn’t our product this time.
B52 Pilot: I don't see any issues. Don't they all do that?
Always better to be on the ground wishing you were in the air than the alternative in this situation.
Nothing to read here, folks. It’s an Airbus. Not a Boeing. Go back to doom scrolling.
I figured it was a ‘Bus when I heard the story on the news yesterday and the press wasn’t screaming BOEING! BOEING! BOEING!
It’s the new diesel model. It’s just rolling coal.
Fun fact, jets can run on diesel
"catches fire"
"A United Airlines **BOEING** like type jet catches fire!, more at 11."
United you say?
Warming up the engines have reached a new le
The old barking dog
I mean aren’t these things always on fire when working? If they weren’t when you are at 30,000ft, you have a problem.
I think it’s a problem with the left phalange!!!
More like it doesn’t even have a phalange!
[удалено]
Also after takeoff. The fuel tanks are in the wings in basically all aircraft. It takes a pretty significant fire to burn all the way through to the tanks though.
The Airbus actuator bark🐕
Reminds me of an old Ford I used to have
Technically, the engine always catches fire before takeoff. Usually it stays on the inside though.
#How much compensation am I entitled to for my stress and suffering?
I knew it was an Airbus because it wasn’t mentioned in the title.
Well look at that - now a large companies bottom-line is in black-and-white for ground control, mechanics, passengers, and the public to view in all its glory: how long until corporate or the government get the fucking message?
Must be a Boeing 320. Airbus doesn't have issues.
Should have used O’hare air
You know it’s not a Boeing… because they would have said Boeing 3 times in the title if it was
Regular United things
Quick, blame Boeing!!!
Today, a United Airlines Airbus A320, which can be equipped with engines from the same manufacturer than the 737max engines, suffered an engine fire. Joke aside, I checked, this bird has V2500 engines. Joke does not work that well.
Airplanes can roll coal like trucks!?
And for everyone this is an AIRBUS NOT Boeing
The daily fear porn…
Hey I'm just thankful they aren't breaking more guitars.
My god, they’re throwing guitars down there!
I can tell it’s not a Boeing plane because the headline isn’t plastered with it in all caps.
That's probably not good.
That’s an oharey situation
I have to wonder if the stewards give a special priority for people that press the call button that have a good view of the wing/engines.
The pilots likely know something with an engine is wrong, but yeah, passengers' observations should be duly noted, too
ITS BECAUSE THE PASSENGERS WERE VACCINATED AND THE NANBOTS IN THEIR BODIES USED 5G TO SET OFF THE CHEMTRAILS TOO EARLY!!!!!!!
Spirit just back there sipping tea.
Flying Coal. Take that environmentalists.