Boeing 787 Main Equipment Bay
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- Опубликовано: 14 окт 2024
- Just a short video showing inside the Main, or Forward, Electronic Equipment Bay
Most of the noise in here is from the cooling system fans drawing air through the components.
The video starts off looking at the rudder/brake pedal linkages and just behind those, the control wheel and column linkages. Both the pedals and control wheel/column are cross connected, so when one pilot moves a control, the other pilot's controls also move.
There are no mechanical connections to any of the control surfaces. Instead, the movement of the controls are fed into sensors called LVDTs (Linear Variable Differential Transformers) and load transducers. An actuator connected to a spring can adjust the level of force needed to move the controls and this simulates the extra force needed to move a control surface when the aircraft speed increases in a conventional aircraft.
The sensors are directly connected to the ACEs (Actuator Control Electronics), The ACEs then communicate to the FCEs (Flight Control Electronics) which provide flight envelope protection, so the pilot shouldn't be able to make the aircraft perform dangerous maneuvers. The modified signal is sent back the ACEs, and the ACEs then control the actual control surface movement via electronically controlled hydraulic actuators.
The heart of the IFE (In Flight Entertainment) system is also located in this equipment bay, and this accounts for some of the enormous amount of wiring. There is a mixture of communication wiring, to and from sensors, electrical power wiring, and fibre optic cables in the mass bundles you can see.
Hollywood would have you believe that this area, and often the landing gear bays, are accessible from the passenger cabin, but this is not the case. The only access is via the external fuselage door you see at the end.
Not something most passengers will have seen, so I hope it's not too boring 😋
Thanks
That is scary complicated looking.
+WysteriaGuitar Yeah, no-one ever wants to change a wire in there :P
Yeah, that or realize when you are finished pulling the wire that they made it too short......ugh! No splices allowed!
Ran pax floor wires on this plane in Charleston. Its beautifully engineered and oh so challenging to build.
almost 100 years of aviation engineering...do not worry, they got it figured out...
@@VaporheadATC I'd splice that in 5 minutes run a wago clamp and be good
Great Video, mechanical and electrical engineering pornography at it's finest!
+Daz P Thanks
It's a sin to watch this video.
I love how modern electronics have played a major role in weight reduction so engineers can put more weight on the plane.
same for cars! CANbus is shitty at times and not the most robust system ever but managed to reduce cost and weight by a large percentage in modern cars
@@penguiin12 fan fact: CAN is used in some modern planes.
@@norbert.kiszka would it be aircraft area network - AAN? since C in CAN is for car? haha
@@penguiin12 I was not joking. CAN in aircraft is still same CAN. More of that, You can find Ethernet network in Boeing 747. We dont need to reinvent wheel.
More people yes . Less leg room yes .
This isn´t 787... This is on Internet Service Provider... So much cables and electronics. Nice video. Beautiful Bird!
well some air craft have the internet now, there sort of an ISP may i say it ! supplying wifi upto 400 mbp/s in business anyway ! a little satilite transceiver is atop the air craft towards the tail, some are a bit up toward the front !
It is indeed a B787.. you can hear the very distinctive Hydraulic pump.
It’s a 787. You can see the core network in the video
Wow...I actually helped tie up the wire looms in this area of the plane in summer of 2019 for a bit (Spirit's timestamp clock was a little too accurate for someone coming off a job that had very lax scheduling, lol), and the area around 0:49 is where I worked! I recognize those looms and they were surprisingly easy to tie up to the airframe. We actually had to follow a specific guideline for exactly how much slack was allowed for each wire loom (about 3 inches, no more or less) and you never, ever pulled on the purple cables. Those contained fiber optics and if you damaged them? Your ass was grass! If you needed more slack on that loom in order to get it to tie up correctly, you were supposed to be uber careful with it and not put any more stress than necessary. Also, the ones that traveled vertically there I think went from the main control panel of the plane to the... I want to say relay panel, but that's not quite what it was. I can't tell you how many times I hit my head on those round bars that connect the floor above to the sides of the fuselage. Also, working around these behemoths was a lot of fun because you could see all the parts that make up the plane and get a feel for just how much goes into producing one of them. I really wish I had lasted longer there; it was one of the more fun and interesting jobs, almost like putting a giant erector set together. I'm probably going to have to apply there again sometime...
Yo do recall erector? I’ve checked the brand and they are gone. There is just shitty lego nowadays. Eondering how erector dissapeared. rip
Which company does this? I'm really interested In Learning how to wire electronics
@@JuanMartinez-vr7bg Spirit Aerosystems in Wichita. They'll take anyone willing to learn, though this job doesn't really teach you how to wire electronics so much as learning how to read a print and assemble the parts. If you want to learn electronics, I'd suggest looking for a tech school with hands-on training. I earned my certifications in two years and it's opened the door to a lot of jobs.
@@millenniumf1138 appreciate it
This is actually quite interesting😎
Seeing this is just.. wow. Working on ERJ-145’s and seeing E-175’s is fucking nothing.. this is just damn beautiful
I will never look at a 787 the same again let alone any aircraft
Edit: now that I've looked at the let alone phrase definition, I cannot think of any other way to describe it
Imagine this is your first day on the job, and they send you in to diagnose a fault.
Spectacular video, I was just wondering what capacity an airplane's batteries have
The Boeing 777 has two 28V 47 amp-hour Ni-Cad batteries, the 787 has two 28V 50 amp-hour Li-Ion batteries, and the 747-400 had two 24V 40 amp-hour Ni-Cad batteries.
Each aircraft has one main battery, and one APU battery.
They are completely separate and each has their own charger.
The 777 and 787 also have smaller FCDC (Flight Control DC) batteries, these are much smaller in capacity and are there to maintain constant power to the fly-by-wire system when the aircraft power sources are switched. For example, from ground power to APU generators, from APU generators to engine generators, or engine generator to APU/RAT generator in an emergency.
Those are the batteries in the aircraft that I know anyway, others may vary.
@@mrifixplanes1813 Wow I never thought that airplanes used Ni-Cad batteries. Thank you very much for your fully satisfactory answer :)
Aah! This should be the tech room for the onboard entertainment system.
So much more untidy than the 747, untidy wiring, where are the nice neat racks of boxes found in the 747 MEC?
Wow. It's like you shrunk yourself and you're inside a laptop or or some other electronic device.
A car is electrical system would be more analogous.
Ok now you have an open circuit somewhere, I need you to trace it.
Lemme grab my Acme open circuit wire tracer.
awesome, man thats a lot more roomier than I ever imagined!
that's absolutely awesome! I would pay gold to see that myself! Thank you very much for sharing with us ;)
+Syrus Wolfe You're very welcome, and thank you for your comment.
Perhaps the very beginning footage shows the space right below the cockpit - central pedestal, control columns, pedals etc
It does, yes.
i though cables would be "more organized" ... of course, i don't want to say they are not perfectly done !! i just imagine bundled and managed in other way ........ ! pretty interesting ......
Most of my collegues and I agree with you. It's not unsafe but not particularly tidy either, other boeing aircraft are much better.
at 1:52 you see a circular connector, with a jumper cable between 2 pins. it looks SO fragle and easy to be remove from position ...!!!
+feliccie andorro Take a closer look, you'll see that the cable passes through a red grommet that's held in a clamp on the connector, this makes sure there's no tension on the actual connecting pins. They're quite strong but you do have to be careful while moving around in the equipment bays. Connectors in non pressurised areas are thankfully much more robust and protected from the elements. You did very well to spot that I must say ☺
But all of them are probably exactly the same.
I definitely wouldn't be happy if I've got the avionic service bulletin or an engineering order which includes routing a couple of new wires in existing bundles...
At 1:43 on the right side of the screen, notice the standard American 120v power plug socket. Kind of weird seeing that on an airplane.
We need you to replace a faulty wire.
Which wire is it?
The white one.
Are the large linkages near the start the control columns from the cockpit?
+Benjamin Choi Yes, from the rudder/brake pedals, and the control wheel/column. There aren't any control cables from these on the 787, only electrical load sensors that feed into the flying computers.
@@TrFusion There is a break-out mechanism, so given enough force it is possible to have one control wheel jammed and the other will still operate. Same for the control column, forwards and backwards.
I can't even imagine what the schematic(s) look like for this.
1:43 Are those power sockets on the right different on the aircrafts country of origin, i.e. this appears to be a US or Japanese plane and would probably have 110V. Would a, say European plane, have their socket layout and deliver 240V?
So far, I only know of North American style outlets, but there's a twist because the plane's internal AC power buses are 115V @ 400 Hz (instead of 60 Hz or 50 Hz, for smaller generators), so the AC outlets accessible to passengers have the power converted to DC, then back to AC @ 60 Hz for compatibility, while other outlets, like the ones in maintenance areas, may be 115V @ 400 Hz and only work with electronics designed to work with 400 Hz AC. You'd have to look for a label next to the outlet to tell the difference between them.
Waooo sophisticated is complicated... Is that the sound of APU..?
It's like being inside of a fine Swiss watch...
Looks like a flying datacenter
Jeeez... Never seen such a clumsy wiring setup like that before! Wow!!
It's better than how they used to do it, I can tell you.
Wow I wish Someone could tell me what the different modules do
Modules?
@@mrifixplanes1813 I’m not quite sure what to call them, but I’m talking about the big electrical boxes/panels you show throughout the video. (For example light brown one at 1:21)
I assume each panel contains electronics for different things. It would be really neat if you could make a video explaining what the different panels do.
@@BGTech1 They are mostly full of contactors and relays. The one you mentioned has thermal circuit breakers, or physical circuit breakers, much like the breaker box of your house. Each black circle on that panel is a circuit breaker, you pull out the button to remove electrical power to that system, so it's safe to work on. You can just about make out the red streamers we attach to the circuit breakers we've pulled to identify them. The 787 has many solid state circuit breakers too, these are controlled in the flight deck via the onboard computer system and some are physically located in those panels. The in flight entertainment system computers are also in this area, there are 3 servers which hold all of the movies and music etc. The 787 has a lot less black boxes as many of the functions that an individual box used to do are now contained in a single computer system much like a PC running different programs. So a 747-400 would have a black box or two for auto-throttle for example, this is now a program in a computer system and is called the auto-throttle computing function.
There's analogue to digital signal converters, that take an analogue voltage signal from a sensor etc and turn it into a digital signal. Digital to digital converters that convert from one computing language to another and electrical to fibre optic and back.. Radio receivers, audio amplifiers, weather radar, gps, ground proximity, flight control computers, and the inertial reference system. Lastly power conversion and conditioning panels that take in the voltage from the ground or engine electrical generators and change it a multitude of different voltages for all the above systems. That's not an exhaustive list either but hope it slightly satisfies your desire for knowledge, cheers.
@@mrifixplanes1813 Thanks for the information. I am thinking about possibly being a avionics technician someday. I love working on electronics and building stuff with electronics. The engineering and designing that goes into avionics and electrical systems is insane and I would love to work on them one day. I once found some old 1960s Collins rack mount avionics boxes from a scrap yard and to this day it’s the most well built and well engineered electronics I’ve seen. I would love to get my hands on some more equipment like that but it’s vary hard to find. Maybe one day I could get lucky to find some more, better yet maybe I could get a job working on avionics systems some day.
Please continue to make more videos! They are vary fascinating!
All 787 fwd EE bays have access from the passenger floor so I’m not sure what you mean by your comment. You can see the ladder going up in your vid.
Nick Anderson You are technically correct, though the option is there to permanently secure the hatch like it is here.
If you took a sleeping bag in there could you get your head down? You could make it quite cosy.
Paul Passat: It's a bit loud in there for sleeping 😋
MrIfixplanes Shame.You could make it quite homely😊
Add a pair of earplugs you'd be fine. Great stowaway
Thousands of points of failure just imagine this when it gets some age on it 😳
Redundancy is key
0:16 looks like something from the terminator lol
Wow, and I thought my company’s data center was complex.
Isn’t there an access door down there from within the cockpit too?
ethancedrik There is an option to have an access door from above the floor but this aircraft doesn’t have it.
Muito bom
Is this the fwd bag or aft (death) bay
Forward
My brain melted
airbus' wiring is soo much cleaner
1:45 all fans shut down, what's the high-frequency noise?
Hydraulic pump
It is what is called "Coil whine", basically it's some of the electrical components vibrating at very high frequency as electrical current passes through them. Most appliances do it but thankfully at a frequency too high for us to hear.
en.wikipedia.org/wiki/Electromagnetically_induced_acoustic_noise
Arcane but very informative .
What are the bag looking things at 2:04?
Sorry? 2:04 is right at the end of the video so I'm not sure what you mean.
If you mean the light yellow things which show up at the 1:00 mark, that's insulation blankets, they're filled with a fibreglass type material a bit like roofing insulation.
If you mean the white pouch that is attached to the structure at 1:48, that's a pouch for an earthing strap that you wear on your wrist and plug in to the aircraft structure to protect electronic components from static electricity.
@@mrifixplanes1813 sorry my bad, is at 1:35, off to the right, they look like bags hanging from a green bracing
@@puerco911 Yeah, those are thermal insulation blankets covering the "box" that is the nose wheel well, the space where the nose landing gear goes when it's up.
@@mrifixplanes1813 is that whole area pressurized or temp controlled?..... And awesome video,, I flown a lot of intercontinental flights on first class, never knew that was all down there!!!
@@puerco911 It is pressurised yes, the area isn't really temperature controlled per se, but all of the electronics are actively cooled by a very powerful fan that draws air from behind the wall in the cargo compartment, which is essentially cabin air, through a HEPA filter. Many tubes, or ducts, then take this air to the equipment racks where it is force fed through the electronic boxes, keeping them cool. Another fan then extracts this hot air and blows it overboard through the cabin outflow valve.
I got question, why are the hydraulics so loud O.o and
+noble6aviaiton cut the and part
+noble6aviaiton There aren't any hydraulic systems in the equipment bay, most of the noise is from the equipment cooling air fans, and the high pitch noise is coil whine from the various electrical transformers.
MrIfixplanes Thanks mate, people say the coil whine is the hydraulics lol, I read over at one of boeings sites that this aircraft consumes a lot of power. But why does it have the coil whine while taxing and before dep. and until the flaps are up? I love the a/c but its pretty loud (the electrical transformers).
+noble6aviaiton Oh sorry, I didn't realise you meant in general, I thought you meant why are the hydraulics so loud in the video.
They're not wrong about consuming lots of power, the 787 can generate about 800 kilowatts from its 4 engine driven generators, quite a lot when you consider a heating element in a kettle is usually around 2 or 3 kilowatts. Or, in 5.5 hours it can generate the same amount of electricity as the average UK household uses in a year!
As for the noise you've heard while taxiing and until the flaps are up I can't say for certain, it might be the hydraulic pumps, the centre system uses electric pumps, but they're on all the time, even after flaps up.
Thanks man!
very interesting as this is about these aircraft I do worry that so much detailed information should be in the public domain as a safety risk and assume you have permission to post with regard to intellectual rights of design/construction and layout of assemblies.
nonetheless nicely done.
David Alford: No need to worry David. Unlike what you see in the movies and on TV, you simply cannot access this area from the cabin. Also, access from the ground is highly restricted and aircraft security is a top priority all over the world.
787 is a public aircraft. If you have the money and the space to store this thing, you can go out and purchase your own and go through the internals all you want. Don't be such a downer.
How could there be any metal shavings in there🤔
Sorry, you've lost me.
@@mrifixplanes1813 oh sorry being sarcastic!? Referencing the whistleblower claim that shoddy production included metal shavings loose around electrical wiring!! Which after your vid does amaze me! In a commercial building conduit is required on all electrical wiring ??
@@scottontheboat2340 As someone who worked on these planes helping tie up the wires, there's no way there are metal shavings in there. The parts come premade to the factory, and don't require any machining to fit. They arrive in pristine condition, and I think if there were metal shavings it was post-production.
If 1 wire troubleshoot plane get damaged
1:54 what is this noise?
That noise is generally known as coil whine.
On a pure technical level, coil whine refers to an undesirable noise emitted by an electronic component vibrating as power runs through an electrical cable. Just about anything with a power source can create coil whine to some degree, but it’s usually caused by an electrical current going through a power-regulating component like a transformer or inductor, causing its electrical wiring to vibrate at a variable frequency. This happens in almost all electrical devices, usually at a frequency and volume that’s inaudible to humans.
@@mrifixplanes1813 great explanation !
The wires looms dosent feel like the have good securing ,and looks hanging with less of integrity
wow :O
Lots cluttered, messy cables. Kind of looks archaic by 21st century standards.
Like looking at a physical representation of a woman’s emotions.
Parece un nodo.
Man! Too complicated, It'll never fly!
Yea, airlines buy these just for the lols
Cut the white wire
That’s a lot
In King Lord Master Friend and my Father Jesus`, Name, Amen.
I said the RED WIRE! 😠
Thank Jeebus Boeing banned Kapton!
spaghetti!!!
*snip*
Wiring is not as neat as an airbus
Didn't Airbus use kapton until 2005?
Part of the reason for that is Boeing engineers more slack into their looms to account for expansion in the airframe. It looks messy, but it's pretty well-organized once you learn the method.
@@millenniumf1138 It is a mess. A350 is much neater and less wiring
@@Sterlingjob I guess, yeah. I worked at Spirit for a bit tying up these looms, and they are not laid out in the most logical manner, but I don't really know enough about engineering to criticize the way it's laid out.
@@millenniumf1138 should be be neat and tidy! No untethered wires!