How Auxiliary Power Units Work | Part 4 : Design

Aircraft type.
* Boeing 777-300ER
APU engine.
* Honeywell 331-500
Aircraft systems explained.
*
Major components covered.
*
Software's used for making the video.
* Blender 3.6 and Filmora 10

[@rudrajyotiroy9400]

Great work. This channel is underrated!

[@Denis_NOT_Dennis]

Very well researched, produced, and presented. Educational too! As another commentor mentioned, this channel is truly underrated and deserves many more subscriptions and views.

[@demal1010]

Requesting a series on the cooling packs and pressurization systems please

[@AircraftScience]

Landing gear and air conditioning systems are the next two major series I'll work on.

[@john.enospahitamos3596]

So accurate. Dont stop please. Thanks!

[@rubes3927]

This was such a great video series, and could not come at a better time whilst revising my ATPL level systems knowledge!! 🤩😂

[@tumurbaatarchinzorig273]

Great work. Thank you!

[@vstore_happiness]

You explained it so well! I can see the effort you put into this. Great job!

[@cielitorobles6643]

At 5:18 it is not a propeller, its a turbine. Yes it looks like a propeller but it is not.

[@gianfrancoluishoyos171]

Great video! Thank you so much for sharing knowledge

[@AircraftScience]

My pleasure!

[@kbd25]

Amazing. You are doing a great Job. Thanks again!

[@Nomad_LA]

These videos are great!!!!

[@trolltube3183]

Thank you for fascinating content. Waiting for the next episode.

[@zlatimirzdravkov8940]

Thank you fort this useful video !

[@AircraftScience]

You are welcome!

[@silvervortex2441]

Amazing work

[@PauloSergioMDC]

Excellent.

[@mubashirghani9344]

You are genius 😍

[@cypher10297]

This is awesome

[@ZARuslan]

Very cemplex and sopfisticated system.

[@Quatuux]

5:18 the ram air TURBINE is a TURBINE not a propeller!

[@AlitaliaTriple7Fan]

Do the Hydraulic System

[@gopalahs6613]

Can you make a video on how oxygen generation system and emergency oxygen generation system works

[@AircraftScience]

I'll cover them in the upcoming air conditioning system series.

[@harishchoudhary1441]

hello sir one confusion is there please reply... after the engine starts the bevel gear is attached to the main shaft is removed from there or not.

[@AircraftScience]

It will continue to run and drive the gearbox of the engine.

[@RachtifasaSomane]

Can you create a new account to all your videos in french?please

[@praveenshetty2066]

🎉❤

[@zachansen8293]

Does the ram air turbine not retract when the APU comes online? Seems like you'd want to not have that drag once it wasn't needed anymore .. especially because you don't have any thrust.

[@iamjesper]

My initial thought would be that you dont want to risk retracting it in case there would be any problem with the apu. The increased drag from the RAT is barely existent

[@zachansen8293]

@@iamjesper barely noticeable until you just barely don't make the field. But they probably know their worst case range and are always within range of an airfield.

[@iamjesper]

@@zachansen8293 having the drag from the two dead engines is far worse than the small ram turbine. ETOPS regulates how far your are can fly with a single engine failure. They dont take dual engine failures in consideration. If both engines die over the ocean you are basically screwed.

[@Bigboyfatso]

RAT cannot be retracted once it is deployed. Maintenance has to retract it on the ground.

[@zachansen8293]

@@iamjesper The drag of the engines is irrelevant to the drag of the RAT. It doesn't matter if something else is more, the question is the impact of the RAT. but as someone else already said there is apparently no retraction mechanism.