737 Electrical Equipment Bay

[@SelvanSelvaraj]

Very indepth video... very hard to make pictures inside fwd E&E...

[@ChrisBrady737]

Thank you, yes the photos were challenging!

[@tomallen6073]

I work for one of the avionics manufacturers, interesting to see where some of our components live.

[@ChrisBrady737]

Great to hear that the video was useful 👍

[@haochen8244]

Filming such a video is so hard even for a 737 maintenance personal. You can learn the development of technology from 737's E-E Bay because it's full of units from different times. 36:05 The design of WHCU(Windows Heat Control Unit) has been updated. There are only two WHCUs installed on MAX or the latset version of NG and one unit controls two windows. One window was controlled by one WHCU in the past. In this case, that's the new dual WHCU and it's Number 2 WHCU which controls right front window and left side window.

[@ChrisBrady737]

I did wonder why I couldn't find the other 2 WHCU's, thanks for explaining the dual WHCU.

[@kivancbayezit7663]

Hello, I am an Avionic Maintenance Engineer for 29 years. I have benefited greatly from your website over the years. Now it is very enjoyable to benefit from your videos. Thank you.

[@ChrisBrady737]

Thank you very much for your kind comments. I am glad they are of help.

[@michaelkorobov4614]

It's indeed a great and highly detailed explanation I was looking for months! Thanks a lot Chris for your dedication in preparing such material and your love to the subject! Best wishes to you from Michael from Israel.

[@ChrisBrady737]

Thank you Michael for your kind words and for watching.

[@peterp4319]

34:00 pretty sure the E3 photo is a NG ... E3-2 on a MAX contains the new SCE (Spoiler Control Electronics)

[@ChrisBrady737]

It could well be, I was mixing NG & MAX photos to try and get the best views.

[@timdawg53]

Very neat video. I've been a passenger on many 737s and enjoy flying the 737 in flight simulator, so it's really neat to see this.

[@ChrisBrady737]

Glad you enjoyed it.

[@K33p1TS1mpL]

Chris Thank you so much for your dedication in providing these videos. I will share it with my colleagues. They are an excellent source of information, they should be part of the Tech School programs

[@ChrisBrady737]

Thank you for your kind words, glad you are finding them useful

[@K33p1TS1mpL]

Just started following you on LinkedIn

[@yusufgunay5291]

Hı. Im a student of aircraft technician school. I have an assignment. Can I use this video for my assignment?

[@ChrisBrady737]

As your use is educational and not for profit then you can use the video. Please credit the video to my channel.

[@thatdouche4436]

Fascinating video, thank you. It's amazing how much electronics are needed to keep these planes flying. What's even more amazing is that the bulk of it could fail and any pilot with a decent amount of skill could still plant one of these puppies on the nearest suitable airstrip in a pinch, safely. That's reliability engineering at its finest.

[@ChrisBrady737]

Most systems are duplicated for redundancy, some critical services have triple backup, but yes, even with all electrics gone the 737 can still be flown to a safe landing.

[@quenchize]

Great video, please do one on the autopilot and mcp

[@umi3017]

Didn't see this coming for flight crews..... But still very good background information!

[@ChrisBrady737]

I think it is good for pilots to have an awareness of the behind the scenes technical aspects of the aircraft and engineering work, just as it is important for engineers to have an insight into the pilots role. You can never have too much knowledge!

[@Olivier_NGR]

Thank you very much Chris! Great & useful video!

[@ChrisBrady737]

My pleasure, thanks for watching & tell your colleagues

[@Olivier_NGR]

@@ChrisBrady737 I will, for sure!

[@DR10002]

This is so much detail. Loved it.

[@ChrisBrady737]

Glad you liked it!

[@telescope64]

Thank you for yet another info packed video. Best wishes from Paul.

[@ChrisBrady737]

Thanks Paul, glad you liked the finished product

[@alkitanishihab]

VERY USEFUL THANKS FOR THE AMAZING VIDEO AND EXPLANATION .

[@ChrisBrady737]

My pleasure. Glad it was helpful!

[@wewillrockyou1986]

Honestly never really understood the Boeing philosophy with all the electrical stuff, it feels like they have individual pieces of hardware to control really trivial stuff like FDs and different temperature controllers. I guess it's an artefact of the piecemeal upgrades the 73 has received through its life but I should think it contributes to quite a lot of unnecessary complexity and weight in the systems, especially where "legacy" components are retained on newer versions.

[@ChrisBrady737]

The various boxes in the E&E Bay are made by different companies who specialise in those systems. Boeing is the airframe manufacturer and Smiths / GE / Honeywell / Collins / BAe are the specialists in their areas, hence their boxes are used. NB the airlines get to choose which supplier they want for each box where there is a choice. It is exactly the same with Airbus and all of the other airframe manufacturers.

[@PeterEdin]

I absolutely love this channel. for some reason, Jet2 comes to mind. 😀

[@ChrisBrady737]

I wonder why?

[@PeterEdin]

@ChrisBrady737 It was when you closed up the avionics bay, I'm sure I got a quick glimpse of what looked like Jet2 737s in the background and I think Jet2 have mostly Boeing aircraft most being 737s.

[@opsyit]

Amazing thank you captain ı love you

[@ChrisBrady737]

You are very welcome

[@DezuKiwami]

I have a not-so-technical question; from what I understand, the forward EE bay (near the passenger entrance) is not locked, right? Which would mean could walk up there, open the batch and mess with the electronics? I was told this is the case for many planes and was baffled, found it hard to believe.

[@ChrisBrady737]

If you mean is the E & E Bay at risk from passenger interference, then no it is not. The hatch is not easy to find or open. If you did manage to open it then a warning light would appear in the flightdeck, as would warning lights if any equipment were disturbed. I would also bet that no passenger could ever get as far as the hatch without detection by ground staff.

[@DezuKiwami]

@@ChrisBrady737 thanks for your quick and informative answer. I was watching the new MH370 documentary on Netflix in which it is stated by aviation journalist Jeff Wise that the hatch it usually hidden under carpet, but is you remove the carpet you can open up the hatch relatively easily. If anyone with bad intentions wanted to get in there, I'm sure ground staff would be a relatively trivial obstacle. This was one of the very few videos (or pages on the internet in general) I could find on this EE bay so I expect some other viewers to come and ask you questions

[@ChrisBrady737]

On the 737 the hatch is on the outside of the aircraft, so not an issue in-flight. Trust me, ground staff would be all over anybody who tried to get in to that hatch and the pilots would instantly know if it had happened.

[@moboy4779]

I so wish you made a Boeing 747 Technical Channel.

[@ChrisBrady737]

There is a gap in the market if you want to try it!

[@moboy4779]

I haven't got your brains @@ChrisBrady737 🙂

[@stephenbonin3049]

RCCB is a Reverse Current Circuit Breaker.

[@ChrisBrady737]

According to the AMM SDS Chapter 24, an RCCB is a Remote Control Circuit Breaker.

[@TacticalTaylor]

Invaluable resource! I fly the P8, and in one of our checklists regarding smoke/fumes, we are directed to move the Equipment Cooling switches to Alt; is there a reason why this would be important in your opinion? It seems that moving the switches to alt would simply change the fan affecting supply/exhaust, rather than doing anything that would combat smoke/fumes from entering the flight deck.

[@ChrisBrady737]

Hi Christian, that step is also there on the regular 737 Smoke, Fire or Fumes checklist. You are correct it does simply changeover the fans but that could eliminate the source if the source was the normal fans. The 757 in particular had a lot of problems with smoke incidents from the bearings of the equip cooling fans. PS pls PM me, I would love to improve my P8 video and need some more insight.

[@TacticalTaylor]

@@ChrisBrady737 Thanks for the knowledge, appreciate the info! I'll be honest, not entirely sure how to PM on KZbin, but I'd be happy to help if you can tell me how

[@ajayiakinola9672]

Just in time, pls where is the static inverter RCCB located in the e&e bay ?

[@ChrisBrady737]

It is in the J9 junction box

[@elmin2323]

Make a autopilot video 👍

[@ChrisBrady737]

Thanks for the suggestion

[@sakshikhorana]

Thank you for sharing 😊

[@ChrisBrady737]

My pleasure, thanks for watching.

[@opsyit]

You have a fwd e bay map?

[@ChrisBrady737]

No sorry. But there is not very much in there.

[@bk8541]

Had a water ingress issue today. The cabin crew was performing their preflight check, got distracted while water was running in the sink, the sink drainage was malfunctioning, and lots of water got spilled, reached into fight deck floor as well. Plenty of water flew out of drainage holes, but now I have trouble recollecting whether it was the forward equipment bay or the aft. I remember that around a third of a bucket of water splashed on the apron. Nothing seemed malfunctioning though. The plane stayed for an hour while maintenance fixed the sink issue

[@ChrisBrady737]

Interesting. Most of the water in the galley should have gone down the drain holes in the doorways. If it got into the flightdeck it should drain into the E&E bay but be caught by the drip pans over the racks.

[@bk8541]

@@ChrisBrady737 it was a scary experience… who to be held responsible if things went south and some equipment failed?…

[@ChrisBrady737]

The engineers who inspected and signed off the aircraft. Did you or they make a tech log entry for the water spillage?

[@bk8541]

@@ChrisBrady737 they did