737NG Air Conditioning System explained | Real 737 Pilot

Let's have a close look at the Air Conditioning System in the Boeing 737.

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Tools and addons used in this video:
OBS Studio

My system specs:
RTX3080Ti
32GB RAM
Windows 10 Pro

My hardware:
Thrustmaster Boeing Yoke and Throttle
Thrustmaster HOTAS Warthog
Thrustmaster Pendular Pedals

[ADriver]

You guys are right of course that RAM air does not actually enter the bleed air system, but is used exclusively for cooling bleed air in the heat exchanges.
I should probably take a few more days off youtube and actually off anything after 5 days of work, landing around 2AM every time.

[razghost]

Pmdg really needs to simulate cabin crew complaining about the temperature

[akarhu]

I'd recommend you'd re-check the beginning of the video where you describe the pack function as this is somewhat misleading explanation. Ram air is not introduced into the air conditioning flow, it flows through the heat exhangers only. All the air flowing into the air conditioning system comes from the bleed air alone.

Simplified, the hot air is the part of the bleed air that bypasses the pack. And the cold air is the part that is cooled by the primary heat exchanger, then re-heated by the pack compressor, then cooled again by the secondary heat exhanger and then further cooled by powering the pack turbine, which in turn powers the pack compressor. The ram air is simply used as a heat exchange medium in the heat exchangers, all of it comes in from the ram air inlets and gets dumped overboard after going through the two heat exchangers where no mixing of the air flows take place.

[departingthefix]

I totally agree with Arto of the misleading description of Ram Air function. It is only as a cooling medium to cool the hot air across the primary heat exchange not to be introduced into the conditioned airflow to cabin. Also as he stated if further cooling required the supplied airflow is routed the Air cycle Machine for its cooling functions. This is by no means a de-merit point because of all your previous videos of high calibre and sound info, so please accept it as critique not as criticism. Prost

[SERoadking]

Enjoying these detail descriptions of each system. Great job.

[thomasukdd]

Make please a video about how to make touch and go trainings on 737)

[CanadianStig]

These system educational videos are very interesting and I learned something new! Please keep them coming !

[Nemura]

This is the type of video I like.. Knowing the system in deep.

[anthonymorris]

Great video! Where can we get a copy of the FCOM you are using?

[SandroSalgueiro]

Great video, please make more systems videos based on the FCOM!

[erayozdemir]

hi captain, you r amazing, thnk you so much for the contents, Im in lifus and Im learning better with your videos. I want to ask you some questions captain and if you can answer that would be awasome because I cant find anywhere.

1-Primary and standby electronic control funtions? What do day do exactly? We have pack valve but also primary and standy pack control valves, If pack overheat occurs we already have sensor in down stream of mix manifold and also if we lose both of them fcom says pack continous to operate without temprature control. Its really challing to understand their functions.
2- Also Left and right electronic controller are the same thing as primary and stand by controller? What do they do and also confusing thing is, if we we lose flight deck trim air…does that sentence mean right elecktronic controller failed because fcom also says right electronic controller controls flight deck and forward cabin temparature . Im really confused about this electronic units plz enlighten me . Thank you so much captain

[davidbrentnoel]

Thank you. I knew how to ask the stewardess for more air. OMG. I am now a very well educated passenger. It would be awesome if you zoomed in so I could read your screen.

Is there any pressure from management for the pilots to keep the system in auto for fuel consumption?

[ヘンリエッタ-wr]

Thank you for the video!
Just want to know how or where did you get the PMDG documentation in the video

[LamarAerospace]

Where can I find all of this documentation?

[Brandon]

you said to set the temp to 28-30c? Most people are comfortable around 21C. 28C is WAY to warm...

[pilotboy]

When putting the temp knob in manual I can't seem to get out back to auto. Is this a bug?