How Auxiliary Power Units Work | Part 1 : Starting

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Aircraft type.
* Boeing 777-300ER
APU engine.
* Honeywell 331-500
Aircraft systems explained
* Auxiliary power unit
* Electrical load management system
Major components covered.
* Main and APU battery, power distribution panel, APU engine, air inlet duct, inlet door, apu dc pump, electric actuator, fuel cluster, ignition unit, igniter plug and APU controller.
* Reverse flow annular combustor, centrifugal compressor, axial flow turbine, swirler, fuel nozzle, accessory gearbox, electric starter, pawl clutch mechanism, impeller, diffuser, stator, rotor, exhaust duct and fuel manifolds.
Software's used for making the video.
* Blender 3.6 and Filmora 10
Background music used in the video.
* (Filmora stock library)

Опубликовано:

21 сен 2024

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Комментарии : 143

@SplashJohn 9 месяцев назад

I'm not in aviation, but I can recognize an excellent graphical and verbal presentation when I see one. Good work!

@thabg007 9 месяцев назад

o man I remember the days on the flight line when I was in the Airforce having to listen to those screeching loud APU's 8-12 hrs a day, Yes I had (double) hearing protection. Its louder than the turbofan engine is (at idle). We used the APU to generate electrical & hydraulic pressure to load the gun system with ammo while at the same time removing the spent shell casings. There was a machine to connect to externally for electricity and hydraulics, it was taught to us in practice. But in real world use, it was never used, well at least not at the base I was at.

@po1ly414 9 месяцев назад

A-10?

@thabg007 9 месяцев назад

@@po1ly414 yea, how did you know?

@aarond.8831 8 месяцев назад

A-10. One of the few that keeps its empties.

@grumpyBSTRD 8 месяцев назад

Security forces and guarded c17’s and kc-135 refueler. Never knew wtf was screeching every damn day until I started getting into flight sims. It all made sense lol. Ear pro did nothing 😂

@Greatdome99 8 месяцев назад

Military aviation equipment is exempt from federal emissions, noise and fuel efficiency stds, so they are usually loud, smoky and toxic. Commercial is not.

@ryanreedgibson 8 месяцев назад

My dad and brothers worked on the industrial piping for the Honeywell plant that rebuilt these in Arizona. The plant did nothing but rebuild these APUs all day long. Awesome video!

@kellyfernandx 8 месяцев назад

I'm studying this to help my fiancé answer a test at work... omg this is so complicated lol the engineering behind airplanes is just insane... amazing

@SimonButler 8 месяцев назад

I work on 777s every day and still found this presentation informative and well made! Great job!

@BlackFoxFalcon 9 месяцев назад

Masterpiece of engineering. Like pretty much everything in aviation.

@CHOXON2CHOXOFF 9 месяцев назад

As usual, awesome animation and detailed. Keep going, we need such videos in our field for better understanding.

@AircraftScience 9 месяцев назад

Thanks, will do!

@grantnaval4519 9 месяцев назад

Now this. Is improvement! Amazingly done as always. From GE90 engine start and now goin' to the APU! Amazing and great! Thank you for this. As an aircraft mechanic with this type training. YOU MADE EXPLAINING. Easy. Always here to watch and see you go!

@AircraftScience 9 месяцев назад

Thanks a lot!

@DavK637 8 месяцев назад

this is a damn good animation for those that are visual learners. thank you aircraft science for taking the time to make this

@주인공-m7t 9 месяцев назад

crazy quality I’ve ever seen about APU

@gepset 8 месяцев назад

Great video. Interesting to see the APU follow the traditional British jet layout.

@DropBear69 9 месяцев назад

This was excellent. Your videos are getting better with every release. Thanks heaps!

@AircraftScience 9 месяцев назад

My pleasure!

@jeylful 3 месяца назад

Fabulous animation and explanation! Thank you!

@demal1010 9 месяцев назад

Heading been a ramp agent for a certain amount of time for a regional carrier, who used CRJ200's that had the APU exhaust at ground level, you had to walk quickly past all the heat if you were walking back there. (However in frigid temps it was a nice heat source outdoors lol)

@pdks7088 3 месяца назад

Absolutely amazing work. So helpful video!

@rhiannacoady8370 4 месяца назад

I will be starting to make these in Honeywell in a few weeks!! So excited!

@flapjack413 7 месяцев назад

I've always wondered where the air intake for an APU was. Very cool!

@oOSpecialProskillsOo 7 месяцев назад

i am probably never going to need this knowledge, but it was very well broken down and presented, great job

@ccacrislan 9 месяцев назад

Absolutely brilliant, I really like and appreciate your job. Thank you. Always looking forward for more of your videos.

@AircraftScience 9 месяцев назад

Many thanks!

@motionsick 7 месяцев назад

This complexity is the reason there are no competitors to Boeing and Airbus. Such a colossal undertaking building a single one of these aircraft.

@seantaggart7382 9 месяцев назад

The apu is awesome Its more than just a starter Its backup power and Emergency pneumatic! Its nice

@11snakePlayz 9 месяцев назад

This will be very useful for a project I'm working on in a game I play.

@john.enospahitamos3596 7 месяцев назад

Dont stop please. Thanks!

@eneebarry6764 9 месяцев назад

It’s absolute and beautifully crafted animation and perfectly rendered here. Tombs up.

@alexkazzeo6208 8 месяцев назад

Fantastic graphics, excellent explanation. Superbly done. Better than the Boeing one. Teach them something.

@zlatimirzdravkov8940 6 месяцев назад

Thanks ! Useful video ! I guess it took you thousands of hours hard work!

@vishwajeet7806 5 месяцев назад

Very nicely explained ❤

@demal1010 9 месяцев назад

Would have been nice to see the pneumatic start option as well as the electric. It's not available till an engine or exterior air supply is running, so i hope it will be covered in an upcoming video.

@AircraftScience 9 месяцев назад

I will cover the pneumatic start system in the APU bleed air section of the series.

@Djunturica 6 дней назад

Brilliant videos!

@Gabidulla-p6c 5 месяцев назад

it's good job, wonderful,brilliant

@troybowen3024 8 месяцев назад

You Really Haft To Be A Genius To Be A Pilot And Designer And Innovator Of These Jet Engines I Tip My Hat To Them

@lmoraz 7 месяцев назад

Very good animation.. waiting for part 2, thanks

@lunganzimande8056 8 месяцев назад

Awesome video! Better than most CBTs

@Humshkin 8 месяцев назад

Best visual video & best explanation ever!! ❤️❤️❤️

@jepleas9159 9 месяцев назад

The dark shadows with the black background make the details difficult to see. RU-vid animators like Jared Owen and AiTelly include more contrasting shades and colors to make the details more visible. Nice work. Your effort really shows.

@jaiyp77 9 месяцев назад

I'm very amazed with your animation videos, it really helps to fill my knowledge. But there's something I'm wondering about the engine, how does the fuel metering system work?

@AircraftScience 9 месяцев назад

Hi, I have plans to cover this topic in the APU performance (part 3) video.

@jaiyp77 9 месяцев назад

@@AircraftScience Thank you very much

@matthaxx7137 8 месяцев назад

Thanks. Question: Does the pawl clutch run the ratchets continuously after starting or is there some sort of disengagement mechanism once the APU is up to speed? Seems that there would be a lot of wear otherwise.

@AircraftScience 8 месяцев назад

The clutch disengages once the motor stops at 50% RPM. As the engine speed increases, the pawls move outward against their spring tension due to centrifugal force. This eliminates contact and thereby reduces wear.

@lilawaffel186 7 месяцев назад

Where is part 2? This is so good thank you!

@AircraftScience 7 месяцев назад

I'm working on it!

@garyroachester1500 8 месяцев назад

Great presentation! can't wait for part 2

@ryanreedgibson 8 месяцев назад

When will part two be done?

@AircraftScience 8 месяцев назад

Hopefully, late January.

@davecrupel2817 8 месяцев назад

So the 777 apu has a pneumatic start option. Interesting. Makes sense if it needs to crank at altitude, and you want to conserve bat power.

@JanV29 9 месяцев назад

Your videos are bonkers man !! Love them ❤

@AircraftScience 9 месяцев назад

Thank you!

@r.robbie7918 8 месяцев назад

Great, ending this interesting episode without telling me HOW electricity and hydrolic pressure is generated... I assume it is coupled somewhere.

@aviationnmaps 9 месяцев назад

Remember that guy that asked you to make this a year ago?

@AircraftScience 9 месяцев назад

Yes, thanks again for suggesting this topic.

@SticksTheFox 8 месяцев назад

The Video: Informative, technical, intresting The Music: Battlefield Butt Rock/ Command & Conquer

@Magan-lg4bc 7 месяцев назад

Absolute GREAT.

@chitralisontakke7186 7 месяцев назад

Waiting for part 2!

@dilandias4018 8 месяцев назад

Awsome bro....thank you for such videos

@AircraftScience 8 месяцев назад

My pleasure!

@udayakumar5348 7 месяцев назад

Small turbine works behind produce small amount of electricity and A/c to cabin and also bleed air to start engine

@BobSmith1980. 8 месяцев назад

I love the graphics

@AusticHardOfHearingSinger 2 месяца назад

Nice!

@stachowi 9 месяцев назад

This channel is amazing.

@jiriprochazka9254 3 месяца назад

What if it's raining and air inlet door are open? Is there some filter to prevent water getting inside the APU turbine?

@mubashirghani9344 6 месяцев назад

Please make video on APU bearings and seals..

@AircraftScience 6 месяцев назад

Noted!

@southernpilot 8 месяцев назад

That was very well done.

@CybershamanX 6 месяцев назад

(0:23) Oooo... So shiny! 😉😎

@orunabho 9 месяцев назад

I always thought there is an internal combustion engine there, a motor at work there. O, a jet engine!!! Nicely explained. What about thrusts it generates?

@justing42 8 месяцев назад

It is negligible. They shut it off after engine start.

@rickybrazzell7348 7 месяцев назад

Nice presentation but where is the generator part of the APU?

@AircraftScience 7 месяцев назад

Coming soon!

@artysanmobile 9 месяцев назад

Superb video!

@richardbriansmith8562 8 месяцев назад

Awesome Video 😊

@PeterWu-n8s 8 месяцев назад

Nice education video ❤! How about pneumatic start! Never use on line ! Ha!😂

@dalemanolas5994 8 месяцев назад

Is the alternator permanently geared in or does it have an electric clutch to engage it once the APU gets up to speed? Presumably the APU drives a hydraulic pump as well. Does that have a clutch? I'm just wondering if the starter motor has to spin all that stuff or is all of that disengaged during starting?

@juggsauce 8 месяцев назад

Always wanted to find a timed-out, old apu and put it in an old truck. Power an electric motor. Wouldn't be very efficient but fuck would it be cool.

@formatogrande397 9 месяцев назад

brilliant content

@maheshanura5413 9 месяцев назад

Thank you very much sir.....🙏🙏🙏

@AircraftScience 9 месяцев назад

Most welcome

@randygravel2057 7 месяцев назад

Ok this video ends where the apu is running. You forgot to tell how is the electricity made. Where is the “auxiliary power” made?

@sssaeedssahz.1434 8 месяцев назад

Excellent👌❤

@lordpickle8424 8 месяцев назад

Thank you, come again!

@russchadwell 8 месяцев назад

Are there any "APU" engines that might be rigged to fly some sort of small aircraft? A means for some hobbiest to get some inexpensive second hand "jet" engines.

@MonkPetite 8 месяцев назад

And apu with an air starter as an option ? That’s a wrong stament. The igniters work before fuel is added. Fuel nozzles are mostly duplex. Meaning they have two stage function for starting and normal operations, you can’t dump all fuel less the 40 %.

@n.s.shankar 9 месяцев назад

Brilliant❤

@LezamaDamian 8 месяцев назад

Nice video. However, it's kind of too slow with long pauses, it would be way better if it were more dynamic. Also is it a human narrator or AI? A little more emotion would not hurt either 😊

@AircraftScience 8 месяцев назад

Noted!

@Lx-photos 4 месяца назад

Very dark. Nothing visible.

@myheart-ok4ie 8 месяцев назад

We want a video of how to run the engine via the APU

@AircraftScience 8 месяцев назад

The main engine start will be covered in the second part of the series.

@apivovarov2 9 месяцев назад

turbine blades should be curved opposite to what is shown on the video . The angle is ok, but the curvature shape is not

@marioecheverria5152 4 месяца назад

Where is the generator?? You explain the mechanical turbine but… the electrical part?

@AircraftScience 4 месяца назад

Part 2!

@RounakKushwaha 9 месяцев назад

Sooo good

@shenghan9385 6 месяцев назад

❤

@arafatamin4521 Месяц назад

why Dark?? I'm From Bangladesh.

@keitha.9788 7 месяцев назад

Get rid of the black background. It will increase the contrast and makes your diagrams more visible....

@Kirmo13 3 месяца назад

is the RPM expressed as a percentage of maximum speed?

@AircraftScience 2 месяца назад

Yes!

@abdulla9042 8 месяцев назад

Hello, I can translate your video?

@musiegirma2728 7 месяцев назад

Can you do for airbus apu

@zachansen8293 8 месяцев назад

that was a REALLY well done video. I'm much more likely to downvote a bad video than upvote a good one but I had nothing bad to say about this other than I'm sad the next one isn't out yet.

@MrPLC999 7 месяцев назад

Nice to get an authoritative presentation for a change, instead of the usual tedious dumb-down BBC-style documentary where every sentence has to contain a word like enormous, massive, vast, prodigious, tremendous, monumental, colossal, immense, gigantic, mammoth, stupendous, etc, etc, etc...

@thardyryll 6 месяцев назад

Good point. I get so weary of the gearhead shows where every host has to act like he has just snorted 20 lines of coke and meth just to make the presentation sound “exciting”.

@josephjeno6709 7 месяцев назад

When will come next part video

@Takeitlightly6 6 месяцев назад

That plane looks very pimped

@suhailummer2697 9 месяцев назад

👌

@agungdwif 7 месяцев назад

Part 2???

@WhyHow-vn6fo 6 месяцев назад

What software did u use bro

@AircraftScience 6 месяцев назад

Blender.

@WhyHow-vn6fo 6 месяцев назад

Tq for ur reply and please upload some videos about modelling

@-fuk57 6 месяцев назад

Robot voice.

@AP-eh6gr 3 месяца назад

NOW I know whats inside of the assh*le of every commercial plane!

@jeffy210 9 месяцев назад

You don't really think about the fact there's a 3rd engine on a twin engine aircraft.

@lilsnowycaraudio 9 месяцев назад

Actually 4 if you also take the rat into account

@justing42 8 месяцев назад

@@lilsnowycaraudiothe rat is a pump

@tumurbaatarchinzorig273 5 месяцев назад

Landing gear pls

@AircraftScience 5 месяцев назад

The next series will be on landing gear.

@tumurbaatarchinzorig273 5 месяцев назад

@@AircraftScience Thank you so much!

@danko6582 8 месяцев назад

All that without even selecting Start!

@HongyaMa 7 месяцев назад

This is what I do with APUs - GTCP 36-55-c from an AH 64 and the M1A1 gen set from the Air Force for the Jet Ecec ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fRp2uAYWa_A.html

@engchoontan8483 8 месяцев назад

Get a truck mechanic to sit in class with paper notes version of this And similar to this, gas-turbine notes And also turbo-fan notes and turbo-prop notes and turbo-shaft notes Tell him to treat 28vDC as 24v truck battery. Impeller start as air-brakes of truck. Cascading battery to air tank to brakes to impeller to battery then battery and impeller the thingy. The thingy should impeller flow lub and fuel by crank and the battery should blow the bloody thing up. Redraw something over the weekend by combining 2 shafts like a cockster turboshaft into a 2 shaft turbo prop and use air around duct-in-duct to cool itself, vanes support. 2 shaft can exhaust thrust straight and rotor big. See what happens.

@engchoontan8483 8 месяцев назад

Cocksters use wire mesh covers instead of stators and no chicken-chop

@engchoontan8483 8 месяцев назад

Double shaft designs of turbo prop and turbo shaft allows intake to be almost anywhere and angle, same for exhaust and resultant thrust and also shaft. 3 items put almost anywhere and almost any angle. Terminology of variable geometry is expensive. Same for variable pitch and variable thrust vector (TVC - thrust vector control) Life hack = anti name-dropping, anti brand-dropping, anti deep-meaning, anti fancy wording, anti university terminology... Cross discipline, cross industry, ... Cheaper

@RounakKushwaha 9 месяцев назад

😮