You blew my mind. I know it isn't a real 737 that I was experimenting with in a simulator (Xplane 11 737-800) But, I tried the crossbleed start from one engine to another and freaking worked. You never cease to amaze me!
I remember being on an early morning flight out of a small airport. Just as we were walking up to a CRJ, the pilot had us wait outside the plane, as they were having problems with the APU not starting. Thanks for the video.
Thanks! We had trouble with the APU starting on our flight from JFK to Copenhagen on a 767. We had already been pushed out and had to come back into the gate while mechanics tried starting it. Jet fuel odor in the cabin was very strong. I didn’t know if it was a major concern or not.
Amazing videos sir ! Thanks for all the great videos. I'm a big fan of aviation industry especially Pilot. Due to economic factors I couldn't afford for Pilot training and have ended up in IT industry but I'm still a big big fan of Pilots and your TH-cam videos, android apps and Instagram accounts are making me happy since I'm at-least able see / understand the basics of flying aircrafts. Thanks again !
Mentour Pilot and PRODUCERS, CREW, videos better and better. I thought the APU was only for starting the engines and the engines provided everything else. I was surprised that the APU was the everything else and the engines are strictly THRUST. Thanks for sharing, YET ANOTHER EXCELLENT VIDEO.
Mentour Pilot I see, Thank you. If I understand correctly they only have problems when poorly maintained and during acceleration. I hope someone solves that problem soon. It has been causing our f-35 pilots problems. They may have solved the issue already, for all I know. Great channel, thanks again. Take care.
Once I was told about the power of a medium size APU (go and figure what they mean by medium) is around 400KVA which is a LOT. You can power 4 or 5 residencial buildings from that figure. Guess the AC unit on the plane needs serious power.
The day will come when we are gonna be able to recycle that stuff and turn it into fuel... so get ready for lots of broccoli, beans and prune juice in the plane menu... lmao
Great video as always Mr. Mentour but I have a question. We see that the apu on this particular airplane has the inoperative sticker on it...isnt apu a critical thing when it comes to an emergency? How can an airplane get operational allowance without having an operating apu?? Thank you in advance
How much power does the GPU provide? I'm guessing it outputs 3-phase 200V, but is it sufficient to run everything on the plane? It seems like that power cable is kind of small to power both buses.
Hi Mentour, great video again and very educational , quick question , what is that noise we hear after APU is turned off and engines starts on pushback ( sounds like someone is sawing the plane in pieces) ? not sure you know what i mean.....
Hi mentour. Love your vids. Vary infornative even for novice and non pilots buf flying enthusiasts like me. Anyways, im always curious. For triple engined planes like the dc series, where do the exhaust gasses exit? I cant see any pther holes other than the apu exhaust where the exhaust of the 3rd engine can pass. Do they share exhaust exit? (Pardon if there are mistakes on the terminologies)
I have my interview coming up to get onto an APTL course at the end of the month, and these videos just provide perfect resources for revision and help to further my chances of actually succeeding in the interview so thank you.
I work with aircraft like the a380s and 737s but I’ve never know how does the apu suck in air? As far as I’m aware it’d need air to run? But haven’t seen any intake exhausts? Shed some light please :)
there are lot of pilots who answers and many users are benefited by them by clearing their doubts and gets millions or thousands of views and upvotes. not only it's about the profession it's all about life (everything). just give it a try you'll know.
Could you make a video explaining How does the cool by-pass air (turbo-fan) help with the thrust , how does mixing it with the hot jet air strengthen the thrust? If you already have a video, I'd love if you could point me in the right direction towards finding it. Thank you.
Hi! You really make great videos! :) My question is what do you think about studying accident reports and watching the 'Air crash investigation' series on NatGeo ? Does this improve someone as a pilot? Do you even do so?
apu -> either just pressurized air for fan blade spinup or actually providing ac and dc power via generator. also sometimes pressurizing parts of the hydraulics system. did i get that right?
The hydraulics are supplied by 2 armed actuator pumps at 1500 psi.each. that the humming sound you hear under the floor. Its to supply landing gear to lift and lock after takeoff.
Hi Sir! Very intersted how many hours do you totally have? and how many hours as a captain? what are the criteria in order to get promoted? and how can you change the type of plane? and is it possible to swap from Airbus to Boeing ?
There's no dedicated video on checklists, is there one? It would be interesting to learn how the quick reference works, how you proceed with the flow when something different from expectations...
Sir, could You explain 'cross bleed engine start'? Why do you need it? Why don't You do it at the gate? Because it takes too much time after push back. Thank You for all information.
I skip that too, why bother ? Just connect the battery, start the APU, connect the two main AC buses, then open the APU bleed air valve, turn on the fuel pumps and begin the main engine start "procedure". Once the main engines are started begin the powerback, line up on the runway, then just TAKE OFF ! (Granted it's all happening on X-Plane 11...)
+mentourpilot I'm very surprised you're allowed to take off with an inoperable APU. If you had a double engine flame out (flying through an ash cloud for example) would you be able to restart the engines without it? Also wouldn't you then be entirely reliant on the RAT thus removing a whole layer of redundancy?
Hi Mentour. Why might the APU not be functional before a flight? You make it sound like it's a common thing to happen, and they seem like a fairly important part of an aircraft to me, so why do they not repair them as soon as possible?
Hi. Does the APU work only the air conditioning system during the whole flight or only on the ground and then the main engines provide the air conditioning? Sorry for bad English ✌
Mentour!! I am 13 and I live in the Netherlands. I have been interested in flight since I was 6. This year I flew a boeing 737-800 on a flight simulator and I loved it!! Now I want to be a pilot but everything and everyone says that the chance is 95% that you'll waste your money on the pilot education because you won't get a job. Is it really that bad!!!?? Im only thirteen so I have lots of years to decide but I want something to work towards. Is there a chance that in 4 to 6 years the ods of becoming a pilot increased? I want to become a pilot so bad!! If I can't be a pilot on an airline what are other jobs that are ascociated with flight? Thanks in advance!
Battery power is 28 VDC and AC power is 115 volts but at 400 Hz not 50 like the rest of the world, or 60 like Canada the USA & Mexico. Higher frequencies mean transformers can be much lighter weight. Some parts of upstate New York ran on 25 Hz, and you had to buy special 25Hz rated appliances and radios or they would simply burn up. They all had heavier motors and transformers in them, and this cost between 10% and 50% more than a 60 Hz unit.
You do an excellent job with these explanations. I was curious - do you have much trouble with hot starts on the apu? I've never had the opportunity to use one, as we relied on ground support equipment on everything I flew. I'm sure you have all kinds of automatic controls for such an event, just wondered if the hot starts were even possible due to auto intervention.
Captain, I would like to ask, when was the first APU fitted to a Boeing B707? What was the APU model? What airline installed it first to their fleet of B707s?
Hey @mentour pilot. Can you please explain the recent air asia scandal where by the pilots allegedly blasted the air-con to get every one off the plane. Fact or fiction?
Can you make a video on the route to becoming an airline pilot. I am 15 and want to become a pilot but I have almost no idea what rout I need to take. At the moment I'm just taking the subjects that I think I may need as it's hard to find any decent advice online. Can you help?
Math Physics English mainly. Then aerodynamics ground school. Weather aspects. There are videos right on this site ads to flight courses for beginners on simulator. Brilliant is one offering classes virtually. Curiosity also. Mentour says it at the end of most videos. Follow until the end. They are absolutely fantastic.
Where I come from, people are not well informed about airplanes. I have met so many people who say 'the (main) engine is at the tail of the plane" despite the two very large and obvious engines under the wings.
There's a lot of ignorance. People just board the plane and sit down. They know little or care how it operates. They think auto pilot means the plane completely flies itself. A robot could be in the cockpit.
Why another tiny jet? why not a piston generator? Sounds like it would be easier to source parts and replacements if it was just a really big civilian piston generator rather than a small jet turbine.
This long controlled delays before starting the APU, what happens if you want to use it and start the engine in the air?, will you be waiting for this long before starting the failled engines to recover from falling from the sky?
Is the APU the switch that was turned on in the movie "Sully"? If it's already on during flight how did sully turn it on after the bird strike? Or am I completely off
Not at all. The flushing noise actually comes from the air rushing through the bowl down the waste tank and ultimately outside through a special vent. That's because it uses differential pressure between the cabin and the outside. And if you flush the toilet on the ground, a large vacuum cleaner kicks in to suck up your disposal into the waste tank since there's no differential pressure.
Thank u so much cap it's so helpful well I was flying in air India from India to Dubai in flight it was hot and after few seconds or mins I could feel it's getting cold in flight and now I understood what was going on as GPU disengage and APU became on as I could hear some humming sound from behind it was to much disturbing thanks for ur info keep up the good work I have one question I have heard that an airhost or hostress can be come pilot also how is that possible cause both field are not same please do reply
You blew my mind. I know it isn't a real 737 that I was experimenting with in a simulator (Xplane 11 737-800) But, I tried the crossbleed start from one engine to another and freaking worked. You never cease to amaze me!
It's a privilege being able to see all this genuine 'inside' stuff. Thank you! :-)
I remember being on an early morning flight out of a small airport. Just as we were walking up to a CRJ, the pilot had us wait outside the plane, as they were having problems with the APU not starting. Thanks for the video.
It's amazing to see these videos and you actually doing stuff in the cockpit - brilliant!!! I would love more of them
You can also connect warm (not only cold) air externally and it's common in the colder months up here.
Thanks! We had trouble with the APU starting on our flight from JFK to Copenhagen on a 767. We had already been pushed out and had to come back into the gate while mechanics tried starting it. Jet fuel odor in the cabin was very strong. I didn’t know if it was a major concern or not.
Very nice video! Really like it that you actually show us how to do it in the cockpit!!
Your video’s are awesome. Thanks so much you are doing a great service to us simmers. Very professional and thorough
I can't even think of the last time i had an absolutely fantastic day.
To be honest I don't think I have ever described one of my days, during my 53 years, in that way 😅.
Amazing videos sir ! Thanks for all the great videos. I'm a big fan of aviation industry especially Pilot. Due to economic factors I couldn't afford for Pilot training and have ended up in IT industry but I'm still a big big fan of Pilots and your TH-cam videos, android apps and Instagram accounts are making me happy since I'm at-least able see / understand the basics of flying aircrafts. Thanks again !
Hi,
Great to hear.
I have a very similar channel to Mentour but flying small planes.
Just for your interest to check it out
Thanks ! Will check that out.
Mentour Pilot and PRODUCERS, CREW, videos better and better. I thought the APU was only for starting the engines and the engines provided everything else. I was surprised that the APU was the everything else and the engines are strictly THRUST. Thanks for sharing, YET ANOTHER EXCELLENT VIDEO.
Thank you Peter.... very interesting! Love your house & love your videos!
I'm so grateful for your knowledge I always wanted to know what was in the back of a 747 brilliant content sit please stay safe
You are just ny best instructor, thank you
Excellent video! Videos from the cockpit are amazing!
You explain in very simple way I love it. Thank you
I really like this technical format!
Thanks Mentour, I love your videos and I'm really enjoying the new content!
Thanks again, Petter!
A certain someone looks very comfortable on the sun lounger, with your (?) cap on 😄
As usual, fantastic video. Very informative.
Great you do podcasts from the office! Keep them coming!
Beautiful presentation and keep going ahead for more videos captain
Clear and exhaustive as always, thank you Mentour !!!! :D :D
Very comprehensive. Does the APU have the same problem with bleed air contamination as the main engines?
Mentour Pilot I see, Thank you. If I understand correctly they only have problems when poorly maintained and during acceleration.
I hope someone solves that problem soon. It has been causing our f-35 pilots problems. They may have solved the issue already, for all I know.
Great channel, thanks again. Take care.
Another great video
Nice video! Thanks for the demo!;))
very nice done captain.
Another excellent video indeed. Can i get an answer about boosting up APU in B737NG ? Is there a possibility? like we can do it in A320......
very nice video
Excellent explained
Hey Mentour, can you do a video about what buses are? Thanks
Super video!!!
Once I was told about the power of a medium size APU (go and figure what they mean by medium) is around 400KVA which is a LOT. You can power 4 or 5 residencial buildings from that figure. Guess the AC unit on the plane needs serious power.
Because it also pressurizes the hull and powers the avionics and hydraulic subsystem.
The 131-9 APU on the 737-NG is rated for 90 kVA electrical power (66 kVA above 31000 ft), and the older APUs used in the 737 series even less.
I used to think that the toilet waste came out of there and decintigrated middair
Hahaha... uusch.
LOL, yeah, it does kinda look like the butt hole of the plane.
They clean out the honey dumper the same way you clean the black and grey water tanks on an RV
The day will come when we are gonna be able to recycle that stuff and turn it into fuel... so get ready for lots of broccoli, beans and prune juice in the plane menu... lmao
Great video as always Mr. Mentour but I have a question. We see that the apu on this particular airplane has the inoperative sticker on it...isnt apu a critical thing when it comes to an emergency? How can an airplane get operational allowance without having an operating apu?? Thank you in advance
How much power does the GPU provide? I'm guessing it outputs 3-phase 200V, but is it sufficient to run everything on the plane? It seems like that power cable is kind of small to power both buses.
Great Videos ✈️
Hi Mentour, great video again and very educational , quick question , what is that noise we hear after APU is turned off and engines starts on pushback ( sounds like someone is sawing the plane in pieces) ? not sure you know what i mean.....
Hi mentour. Love your vids. Vary infornative even for novice and non pilots buf flying enthusiasts like me.
Anyways, im always curious. For triple engined planes like the dc series, where do the exhaust gasses exit? I cant see any pther holes other than the apu exhaust where the exhaust of the 3rd engine can pass. Do they share exhaust exit? (Pardon if there are mistakes on the terminologies)
i love this in the real aircraft cockpit! keep going!
Wow, thank you so much for explain us, very helpful and useful as always
Another great video :)
I have my interview coming up to get onto an APTL course at the end of the month, and these videos just provide perfect resources for revision and help to further my chances of actually succeeding in the interview so thank you.
Wow nice home
Nice Presention
Hey Petter, you mentioned emergency checklists connected to the APU but never got to it. Maybe BLEED AIR FAIL, GENERATOR FAIL, ENGINE FAIL? Cheers!
Great explanation as always!!
Hello Capt , I want to ask why we can only operate APU up to 10,000ft in flt with both elec n air source? what happen if more than that?
hi mentour,
could you do a VOR DME approach explanation video?
keep up the good work on the channel.excellent video by the way.
I work with aircraft like the a380s and 737s but I’ve never know how does the apu suck in air? As far as I’m aware it’d need air to run? But haven’t seen any intake exhausts? Shed some light please :)
Thanks for the video Mentour!
great video thanks.
Please, another vid showing the APU itself and perhaps views of internal bits stripped in a workshop.
there are lot of pilots who answers and many users are benefited by them by clearing their doubts and gets millions or thousands of views and upvotes. not only it's about the profession it's all about life (everything). just give it a try you'll know.
Could you make a video explaining How does the cool by-pass air (turbo-fan) help with the thrust , how does mixing it with the hot jet air strengthen the thrust?
If you already have a video, I'd love if you could point me in the right direction towards finding it.
Thank you.
Hi!
You really make great videos! :)
My question is what do you think about studying accident reports and watching the 'Air crash investigation' series on NatGeo ?
Does this improve someone as a pilot?
Do you even do so?
apu -> either just pressurized air for fan blade spinup or actually providing ac and dc power via generator. also sometimes pressurizing parts of the hydraulics system.
did i get that right?
The hydraulics are supplied by 2 armed actuator pumps at 1500 psi.each. that the humming sound you hear under the floor. Its to supply landing gear to lift and lock after takeoff.
Hi Sir! Very intersted how many hours do you totally have? and how many hours as a captain? what are the criteria in order to get promoted? and how can you change the type of plane? and is it possible to swap from Airbus to Boeing ?
There's no dedicated video on checklists, is there one? It would be interesting to learn how the quick reference works, how you proceed with the flow when something different from expectations...
Check out in his Mentour Pilot App, you will be able to see it! its amazing
Sir, could You explain 'cross bleed engine start'? Why do you need it? Why don't You do it at the gate? Because it takes too much time after push back. Thank You for all information.
Before starting an APU in B737, it's important to do fire warning tests. He forgot to mention it. But u guys don't forget..
I skip that too, why bother ?
Just connect the battery, start the APU, connect the two main AC buses, then open the APU bleed air valve, turn on the fuel pumps and begin the main engine start "procedure".
Once the main engines are started begin the powerback, line up on the runway, then just TAKE OFF !
(Granted it's all happening on X-Plane 11...)
Love the video!!
+mentourpilot I'm very surprised you're allowed to take off with an inoperable APU. If you had a double engine flame out (flying through an ash cloud for example) would you be able to restart the engines without it? Also wouldn't you then be entirely reliant on the RAT thus removing a whole layer of redundancy?
Hi Mentour. Why might the APU not be functional before a flight? You make it sound like it's a common thing to happen, and they seem like a fairly important part of an aircraft to me, so why do they not repair them as soon as possible?
sometimes fault isolation takes time. components or APU itself takes hours of time to replace which is not sometimes possible due to short layout .
Wow, imagine the look on silly’s face when he switches on the APU and it says UNABLE back to him.
Hi. Does the APU work only the air conditioning system during the whole flight or only on the ground and then the main engines provide the air conditioning? Sorry for bad English ✌
Mentour Pilot Thanks 👍 😇
Mentour!! I am 13 and I live in the Netherlands. I have been interested in flight since I was 6. This year I flew a boeing 737-800 on a flight simulator and I loved it!! Now I want to be a pilot but everything and everyone says that the chance is 95% that you'll waste your money on the pilot education because you won't get a job. Is it really that bad!!!?? Im only thirteen so I have lots of years to decide but I want something to work towards. Is there a chance that in 4 to 6 years the ods of becoming a pilot increased? I want to become a pilot so bad!! If I can't be a pilot on an airline what are other jobs that are ascociated with flight? Thanks in advance!
Damn you little kiddo
There are ramp agents mechanics administrative business accounting stewards.
Love your videos! are aircrafts AC or AD usually?
I can't say for aircraft but as an X auto tech cars are DC, since batteries are used onboard batteries themselves are DC.
Battery power is 28 VDC and AC power is 115 volts but at 400 Hz not 50 like the rest of the world, or 60 like Canada the USA & Mexico. Higher frequencies mean transformers can be much lighter weight. Some parts of upstate New York ran on 25 Hz, and you had to buy special 25Hz rated appliances and radios or they would simply burn up. They all had heavier motors and transformers in them, and this cost between 10% and 50% more than a 60 Hz unit.
You do an excellent job with these explanations. I was curious - do you have much trouble with hot starts on the apu? I've never had the opportunity to use one, as we relied on ground support equipment on everything I flew. I'm sure you have all kinds of automatic controls for such an event, just wondered if the hot starts were even possible due to auto intervention.
Captain, I would like to ask, when was the first APU fitted to a Boeing B707? What was the APU model? What airline installed it first to their fleet of B707s?
Hello Mentour! Is there any difference in using the FWD or AFT left fuel pump for ground operation of the APU?
I thought they used the fwd fuel pump because its easier to access and fix should there be anything wrong. *shrug*
Kevin W I've heard about this version:) But may be there is something more hidden behind this?)
Hey @mentour pilot. Can you please explain the recent air asia scandal where by the pilots allegedly blasted the air-con to get every one off the plane. Fact or fiction?
If yiu can explain "Packs" and isolation valve, it will be great !!
Sounds like a really fancy generator
It actually is, except it's also an air compressor too.
Can you make a video on the route to becoming an airline pilot. I am 15 and want to become a pilot but I have almost no idea what rout I need to take. At the moment I'm just taking the subjects that I think I may need as it's hard to find any decent advice online. Can you help?
Hi,
If you are thinking to start a career as a Pilot, I have ome very important key tips in my videos. You may find it helpful to check it out.
Math Physics English mainly. Then aerodynamics ground school. Weather aspects. There are videos right on this site ads to flight courses for beginners on simulator. Brilliant is one offering classes virtually. Curiosity also. Mentour says it at the end of most videos. Follow until the end. They are absolutely fantastic.
great ..
Where I come from, people are not well informed about airplanes. I have met so many people who say 'the (main) engine is at the tail of the plane" despite the two very large and obvious engines under the wings.
There's a lot of ignorance. People just board the plane and sit down. They know little or care how it operates. They think auto pilot means the plane completely flies itself. A robot could be in the cockpit.
It would be nice to see the crossbleed start procedure (even if it's in the simulator) just out of interest.
APU? So I've been calling it a Planus this whole time for nothing then?
Ahahahaha very subtle
Cool
This is aweosme
hi mentor can you do a full start 737 video? irl
👍👍👍
do you need to be afraid of flying even when there happens many passenger aircraft accidents a year?
Can you show us how to do a preflight check ?
No APU Fire alarm test prior to startup?
Does the pilot turn off the APU after or prior to take off?
Thank you very nice as always , am I right in thinking you shut it off in flight as you have the engines ??
yes. and it may be started up again in flight if for example you have a dual engine failure
Why another tiny jet? why not a piston generator? Sounds like it would be easier to source parts and replacements if it was just a really big civilian piston generator rather than a small jet turbine.
For me APU was Accelerated Processing Unit and GPU - Graphics Processing Unit.
hi mentour great video do you think more airlines will be opening more sponsored schemes in the future as I'm only 15
You are shooting this video in Girona Costa Brava airport, I guess😀
This is probably more airline operating procedure dependent, but do you usually start the APU before landing or after?
Dear Capt.,
When you turn off the APU?
hello. When eng bleed air switches ar ON and APU bleed air switch is on as well will be DUAL BLEED air light illuminated when APU is not started?
No🙃No apu bleed, no dual bleed
This long controlled delays before starting the APU, what happens if you want to use it and start the engine in the air?, will you be waiting for this long before starting the failled engines to recover from falling from the sky?
Johnson Aruson
You can windmill start the engines in the air...😉
And its not that long anyway..
Is the APU the switch that was turned on in the movie "Sully"? If it's already on during flight how did sully turn it on after the bird strike? Or am I completely off
The pilots switch the APU off once the engines are running
Hello sir can u tell me plz can only science students are become a pilot what about commerce student they can't become a pilot??
what is wired sound in toilet aircraft after flush? is related In this video?
Not at all.
The flushing noise actually comes from the air rushing through the bowl down the waste tank and ultimately outside through a special vent.
That's because it uses differential pressure between the cabin and the outside.
And if you flush the toilet on the ground, a large vacuum cleaner kicks in to suck up your disposal into the waste tank since there's no differential pressure.
Thank u so much cap it's so helpful well I was flying in air India from India to Dubai in flight it was hot and after few seconds or mins I could feel it's getting cold in flight and now I understood what was going on as GPU disengage and APU became on as I could hear some humming sound from behind it was to much disturbing thanks for ur info keep up the good work I have one question I have heard that an airhost or hostress can be come pilot also how is that possible cause both field are not same please do reply
Thanks cool
Can you use the Apu for hydraulic systems if you have an engine failure at cruising altitude?
Yes, and it happens to be one of the reasons for the presence of two electrical hydraulic pumps on the 737 in addition to the engine driven ones.