APU (auxiliary power unit) and a B777 APU starter change.
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- Опубликовано: 21 сен 2024
- APU (auxiliary power unit) explained and an APU starter change on the B777-200.
Hope you guys enjoyed this. I know a bit of a long video.. but I always talk to much 😅. Thank you for watching. Ask your questions in the comments.. I’m here to help 🤙
#stigaviation #apu #auxiliarypowerunit #electrical #pnumatic #aircraft #systems #themoreyouknow #learningeveryday #aircraftengineers #aircraftmaintenance #aircraftmaintenance #howitworks #wefixyoufly #aviation #mechanic 
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From a Triple Capt, thanks for all the mechanics do to keep us safe.
My pleasure sir.. we will Fix it.. you keep it in the sky ... team work 👍
The sheer complexity of airliners is just... staggering. All the connections, the dependancies, the wiring, the many multiple possible points of failure. The fact that, despite this, they're so reliable is mind boggling!
That’s why I called them engineering marvels 👌
Great to see the mechanics of the APU system and how it works. Thanks Stig
You bet!
Awesome vid Stig!, I was an OEM assembly technician on this particular engine series, the GTCP331-500B, the starter clutch issue didn’t affect the electric starter as much , but it did affect the ATS a lot more, as there was a SB to address it.
Thank you for all your hard work
Hi, who is the manufacturer of this electric starter?
@@jdesmo1 Honeywell
This makes me want to be a better mechanic even in my vehicles. It’s nice to see what it takes to be a peak performance and reliability not only built into the parts, but also the procedures put in place that the aircraft mechanic takes great pride in detail in their work.
It is a beautiful feeling when i send these jets out... lots of pride in my work to keep the souls on board safe.. they are my responsibility
As someone who's never flew on a jetliner but is very interested in how airplanes are maintained and repaired I thank you for the behind the scenes look. 😊
I'm glad you enjoyed it
Great videos that doesn't take 40 mins out of your life yet still manages to fill in the average aviation fan's curiosity, I was genuinely surprised when I saw this channel had anything less than 500k subs. With this production quality I'm sure this channel will blow up one day.
Thank you very much. I appreciate you being here and enjoying the aviation.
Detailed video, now i know how APU works
Glad it was helpful!
Great video. It's nice to see someone that enjoys what they do. This makes me want to switch from United to AA. Keep up the good work.
Thank you very much. UA have amazing mechanics as well
Man I can't thank you enough for the access you provide in your videos. I was a surveillance RADAR maintainer in the Air Force on the E3 Sentry AWACS....but I always loved helping the environmental control guys with things like compressors and heat exchangers on the packs or the engine guys change out igniters (is that what the spark plugs are called?) I even did quite a few IDGs on our TF-33s. Whenever we went on a trip all the maintainers knew it was my job to put oil in the engines. Needless to say as a RADAR troop they loved going on the road with me....NVM that I was often also DD for them too! 😂
thank you for your service, i bet you got some amazing stories
This has become my favourite channel now
I appreciate you being here
I'm anti-power tools myself, grew up in the manual era. Manual lets you "feel" the threads to be aware of/prevent a stripped thread or something.
Just keeps me from damaging fasteners. Slow and steady wins the race
ETOPS - Engines Turn Or Passengers Swim.
🤣🤣🤣
Great insight Sir 👍🏻 we love all the Mechanical and technical stuff. I’m gonna push your channel on an upcoming show - watch for more subs 😉
Thank you so much Sir, i really appreciate that.. thank you for being here
Love your videos !! Can't get enough tech info 😊👍
Many thanks 🙏
I wish I could shadow you for a week or so, it would be awesome, your the man STIG 👌🏾 stay safe pal…. 💙
If I could I would give all a fun tour around these beautiful aircraft.
Thank you for this look inside an area we never usually see. Top quality work and great explanation of your role.
Thank you for being here
Awesome video! Love the thorough explanation!
Thank you for watching, i appreciate you
Great work
Thank you 👍
Mechanic: Fixes APU
Apu: Thank you come again.
👌
Nice job. I knew very little about the APU until now. Thanks.
Glad you liked it!
Excellent repair Stig 🤙!!
Thank you sir. Much appreciated
Great content keep it up and keep growing
Thank you! Will do!
Cool video, thanks. Enjoy the day.
Thanks, you too!
Tyvm this is an interesting occupation
Glad you enjoyed it Fred.
Nice, thanks!!!
My pleasure!
Man this content is sweet!! So enjoyable for avgeeks
Gland you enjoy it
MEL that shit!! Lol Awesome video!
MEL.... hardest working mechanic in the airlines lol
Loved the vid and the other ones you have as well. A&P certified and dispatching for a US airline. Stay safe and thanks
Will do and thank you for all your hard work as well 👍
Thanks for the video, Stig!
Is it true that the 777 has the possibility to start the APU using bleed air? I see in the AIR synoptic page a "START" valve pointing towards the APU box. When would the airplane choose to use air start vs electric start?
Love your videos!
That is correct, good observation... if you look closely you'll actually see the Air starter right above the electric starter. Air start can be achieved if the Electric start is INOP
Another great video although it would have been nice to show the starting of the APU from the Flight Deck.
I wish i could but that would involve showing start up procedure, that unfortunately i can't do, it would become a security issue.
@@StigAviation Understand.
Great video Stig. Do these planes have APU s on the engines themselves or just the one in the rear of the airplane?
The APU, auxiliary power unit is always in the back of the aircraft on these major aircraft. The APU is an engine itself.
I’m working next door at LAX also, hopefully we can reach out soon 😂
Stop by terminal 4. Say hello 👋
thankyou for demystifying flying 😅
My pleasure
Good work sir 👏👏❤😊
So nice of you
Sometimes when a main generator is deferred (not working) the APU is left running for the entire flight to backup the remaining main generator. I’m not sure if that’s a requirement on the 777.
well there as different scenarios when it comes to that. It depends on where its flying and if it is an ETOPS flight
Hello Stig, I hope you are doing well bud. I was wondering if the air starter of the B777 APU is used often?
Does it work with ground support only or can it also be used in flight with engine bleed air?
Very rarely used, or at least I have seen it rarely used. They can use a ground air start cart to spool up and start the APU. I’m not sure you can divert engine air to it tho. I’ll have to double check on that.
The technical name for the APU is 'The Dragon', because when the fuel control fails it spits a 20 foot flame out the back. (Something I've only seen twice in 28 years) 😂🇦🇺
I’ve only seen that once 😅 one of the new guys darn near panics and pulled the T handle 😂. Good thing we stopped him.
super wonderful air craft APU power generation & bleeding air to engines for starting it # but if air bleeding is needed to start the engines fan then why starter is needed ????#❤️🇵🇰
because the engine need to turn via gearbox , and thats why you need a air starter, i talk about this in another video where i do a manual start
I heard its best to use ground power to start the engines as it lowers the maintenance costs of the airplane.
@bulbadox Its SOP for most airlines to use the APU. Otherwise they have to pay for the ground power and start units. Besides once the engines are started the APU is shut down.
ground starting usually happens when the apu bleed is not available.
Using a power cart for starts is not efficient for airlines as they can start off the APU during the push.
you can not start the main engines on a MAX from batteries, you need Bleed air from the APU @@SSaugaCriss
@@StigAviation sorry, I forgot my friend on 37-8 was saying it can do a cross bleed start at idle as opposed to 30% power on the 320. Sorry for the snag post.
550 AMPS, wow!
👍
What’s the best path for a career as aircraft maintenance ? I tell my 16 year old son it could be a good career
Best lather would be to first look into the schools. The FAA website has a list of all the schools that are certified in the country. Depending on the school, it can take from 18 months to 2 years to get the A&P certification. Once done.. I highly recommend going straight to the major airlines. At the moment and in the near future the airlines are desperate for aircraft mechanics. Huge shortage. If that doesn’t work then regional carriers are also in need. You also have the option to work on helicopters. You see the A&P gives you the opportunity to work on ANY aircraft… even the Goodyear blimp. So it’s a very good career path… not easy but very rewarding.
Nice upload. Whats next?
Got a few coming up. Stay tuned 🤙
Love it when the skin gets peeled back to reveal the inner workings. Can't wait for your next reveal. :)
@@MrFalconp1 you wana see what it looks like in a heavy check ? Where the whole aircraft gets stripped?
@@StigAviation I would definitely watch that. Don't want you to go out on a limb but if possible that would be great.
@@StigAviation that might turn into a documentary : )
Are you based out of any of PHX, CLT, or MIA? Don't recognize the terminal buildings
LAX
Stig… since parts are new & not rebuilt, are old units scrapped or recycled? Could you show the onboard batteries? Are the wet cells like cars? I would doubt it. Thanx
Not all parts are new, some parts are refurbished. I have shown on board batteries and previous videos.
Ai filé é um trabalho maravilhozo ECênçacional um a brasso pra você ai passeiro😀👍🏻🤝🏻✍🏻👏🏻👏🏻
Please tell me you are on double time when you do these videos!
Nah just straight time, most of the time. There times where I’m on OT. I just gather a few clips here and there and put the video together later. Just want to share my experience as a aircraft mechanic.
Question, do you know of anyone taking a used, out of service APU and making a small personal aircraft engine out of it? How much are the APUs used?
I have never heard of that, nor have I seen anybody use such equipment on a small jet engine., I do not know how much an APU cost. My assumption would be at least a couple of million dollars.
Would the work you did need to be checked by multiple people and signed off before the plane is allowed to fly again?
this particular job does not require an RII ( required inspection item) . So it would be just me being diligent and reviewing my own work. That being said i am working with a partner, and i did ask him to give it a once over to make sure nothing is out of place.
@StigAviation Thanks for the reply and the really interesting videos.
Why don't planes use 24v electric starter/generators in their main engines and not use bleed air to start the engine. I remember seeing planes of the 70's needing a compressor cart to start engines one at a time. Isn't APU air start on modern planes considered using technology of the 60's and 70's.
APU bleed is still modern tech, but lets take for example the B787... that aircraft is bleedless...it does use electric start for main engines. VFSG ...Variable frequency starter generators. 2 each per engine.
What do they do with the old components? Do they refurbish or discard them?
They get sent to a vendor for refurbishment.
@@StigAviation Thank you! Merry Xmas! Ho ho ho......
Cold and sore throat??
APU is first an electrical source. Secondary and not on all aircraft, it is also an air pneumatic supply
Yes I know… I literally explained that in the video
would it be possible to build a commercial aircraft without an APU and instead rely on batteries?
But batteries have a tendency to drain. You will need to keep charging them
@@StigAviation isn't ground power sufficient? And when the engines are running they will get charged?
@@Dynematic Not sure, but APU could be meant also as a redundancy safety measure in case of a main generator failure?
how did they come up with names like A321, 727-787?
I’m not sure about how Airbus did it, but Boeing has a designation for its 700 series aircraft for commercial aircraft
Is that the reason why you can smell smoke sometimes?
It’s also from the surrounding areas, other aircraft, starting engines and many other ground equipment
👍Do you work at LAX?
yup im LAX based
@@StigAviation Awesome. I passed through here back in 2014, June I think going to the UK on Air New Zealand and Virgin Atlantic. It was my first time to America, LAX and was blown away by how big L.A is and the airport. Also my first trip in one of Air New Zealand's GE90 powered 777-300. The size and sheer power is truly awesome.
I want see 787apu
It doesn’t look much different then any other apu. Just no bleed ducts.
I saw condensation on them, why is that?
Condensation is a natural occurrence on aircraft. They go through. Lots of temperature changes also depends where the aircraft is located. Condensation is not the issue.
you changed the starter all alone??
I had my work partner at the bottom of the ladder assisting me with tooling and manual instructions. But the actual physical labor was just me, there only room for one person in that compartment.
In case the electric one fails.
I believe I answered you my friend. On your previous question 👍
What’s your favorite plane to fly on?
I honestly enjoy them all.
@@StigAviation why is the 787 called the "Dreamliner"?
Because it flys like a dream. And being needed a catchy name for their new airplane
Why do jet engines buzz on takeoff?
Because they are producing extremely a lot amount of power
@@StigAviation stress?
Compression of air and the burn in the combustion chamber that creates all the thrust.
We looking aircraft an microscope
Don’t understand what you mean. Please elaborate
'promo sm'