A320 - Avionics Ventilation

[@Captain_SQ]

This is good. You keep things simple. Easy to understand. Thank you for sharing.

[@palavarastogi4249]

THANKS ALOT FOR THE SESSION IT WAS REALLY GREAT....FULL OF KNOWLEDGE....

[@mayank4856]

Great video , refreshed concept in 2023 . With plus minus changes now in fcom

[@poh]

Yes there is an update will try to make a new one

[@TheGibby3340]

Just a point of interest...Outside temp is not skinair temp. The skinair heat exchanger is simply a boxed section between two ribs. On ground the heat dissipation by it can be enough to melt snow and ice in the right conditions. Point being sometimes on ground the configuration is open when you might expect closed. Or the other way around if the a/c has just arrived and the skin is still cold soaked.

[@poh]

Thank you!

[@RohitSharma-zg2ys]

skin hear exchanger doesn't have coolant. it installed above the cockpit door between frames 12 and 14 in close circuit config. when hot air touch the A/c skin it cools down. A drainage system is included to remove any condensation when the heat exchanger is in operation.

[@poh]

Thank you

[@渡边快斗]

Thanks for sharing this amazing lesson！

[@strato172]

The EXTRACT pb in OVRD forces the system into a closed configuration (and AC air is added to the ventilation air). It doesn't "give the system a chance", it commands it to go into closed config plus AC air.

[@poh]

Technically if you see it's not fully closed circuit as it says in the manual. The cargo underfloors circulation is cut off. Hence its not exactly a closed circuit configuration.

[@NetiNaik]

Hello, firstly thanks for uploading these videos, they are quite helpful! 😊 I am unable to wrap my head around the ground/flight threshold definitions. Considering ground threshold, for example, what does “+12˚C, temperature increasing” mean? Can you explain what happens if the ambient air temperature is 13˚C/11˚C/8˚C while the aircraft is parked at the bay? The language used in FCOM is quite confusing.

[@poh]

You're welcome! Read the following one by one and slowly! 1) Its above 12 outside it remains open 2) If its increasing it remains open 3) If its decreasing and becomes 11 it remains open 4) at 10 remains open 5) at 9 remains open 6) Below 9 it goes closed A) if its below 9 it'll be closed B) if its decreasing it'll remain closed C) if its increasing if 10 it'll remain closed D) if its 11 it'll be closed E) if its 12 it'll be closed F) if above 12 it'll open again!

[@NetiNaik]

@@poh Amazing, I finally understood!! Thank you so much for the clarification!! 😊

[@oscarortega6006]

Best flight instructor that there is on the internet

[@RATINDEXA320]

Great video. In abnormal configuration, since the air is not being discharged anywhere, where does it go? You got AV from the duct allowing air under some pressure going in. you got both fans running. Skins are closed, exchange by pass closed. Where does all this "excess" air go to? Also, when air vents to the underfloor, isnt the underfloor unpressurized? where does this underfloor air go to later on?

[@poh]

There is no excess air, you actually need air because that's why pressure is low in the ducts. Once the system is fine the fault goes away and you've to reset the system to normal and ECAM disappears. Cargo underfloor is pressurized place only. It comes back to the system again.

[@CptMouath]

What about the ventilation of the Cockpit Instruments & Cockpit CBs? In the chart I see only the air passes through the Avionics EQPT! What's the purpose of the SKIN EXCH OUTLET BYPASS VALVE? Why does the air goes to the Avionic Bay? What is Avionic Bay actually? Aren't the EQPTs supposed to be in there? When Airbus FCOM says: "When the EXTRACT pushbutton is set at OVRD, the extract fan is controlled directly from the pushbutton. Both fans continue to run"... So, If the authority of the EXTRACT fan is now transferred from the AEVC to the pilot .. What the hell is the purpose of that if we can't stop the FAN or do anything with FAN???!!! You airbus give me the authority without the ability to control? I have never seen such a very bad documentation publication... There's so so many discrepancies in the Airbus FCOM and a miswritten explanations in terms of context and common sense! Thank you for the effort!

[@aviator5038]

Impressive video, dear please explain about GEN 1 LINE push button as well, which is on EMERGENCY ELECTRICAL POWER PANEL. Thank you.

[@poh]

If you press that button you're preparing the aircraft for an emergency electrical configuration, generally used during smoke procedure.

[@bazokazoro4563]

​@@pohmore details please do we loose all the 80/90VUs

[@zahrarekiza706]

amazing explanations, thanks a lot!!!!

[@poh]

Thank you!

[@rayharkins14]

You are an excellent teacher.....

[@poh]

Thank you

[@tryityourself3870]

Very good video thank you The skin Heat exchanger. do you think the temperature limitations for closed circuit configuration are to ensure the skin is of a cool enough temperature for the exchanger to work effectivly? Thanks

[@poh]

Yes you are right! :)

[@woodpeckerhp]

@@poh Why open circuit when it's 9 and decreasing, isnt it going to overcool the compartment?

[@poh]

When temperature outside is 9 and the air temperature inside is decreasing.. so that means its hotter outside than inside.. so it will help in neutralize the temperature..

[@woodpeckerhp]

@@poh Got it, 9 degree outside and inside temp is decreasing.

[@poojamane8874]

Great explanation as always but could you please explain more about > OR < skin temperature threshold, As skin temperature threshold is not a fixed value but more of a range itself that too moving on both the side 9 and decreasing and 12 and increasing, Hope you understood my doubt.

[@asdf567ish]

Thanks a lot , you explained it so well.Best wishes

[@breks3099]

Tremendously well explained! :)

[@poh]

Thank you

[@a320training5]

A fantastic explanation. Nicely done. 👍

[@poh]

Thank you!

[@captainankush29]

Well explained ✈️

[@sagarawirasinha3269]

Wonderful explanation. Thank you so much...

[@poh]

You're welcome!

[@thomaskientz8338]

Very nice explanations ! Thanks for your time ;)

[@poh]

You're welcome!

[@alharathmohamed-5768]

thank u so much its been very helpful for me

[@poh]

Pleasure! :) You're Welcome!

[@dharatripathi3506]

Thank you so much, Sandesh! It's extremely helpful!

[@poh]

+Dhara Tripathi You're welcome!

[@reen1802]

hi, thanks for explaining this so well.

[@julioar1]

Thank you so much, was very helpful, I have a question, what is the meaning of "Skin temperature threshold"? is the temperature outside? temperature aircraft's skin (fuselage) outside? Im a bit cofused about that.

[@poh]

+Julio Arellano Temperature of the aircraft skin or fuselage on the outside.

[@julioar1]

You are the best, thank you!

[@poh]

+Julio Arellano You're welcome

[@YeeKhaiify]

I m sorry . I still don’t quite get on ground threshold : 12degree Celsius and increasing or 9degree Celsius and decreasing . What do you mean by 12 degree c and increasing ?

[@poh]

Skin temperature of the aircraft is 12 degrees and increasing (skin temperature of the aircraft increasing). 9 and decreasing also means the same. They have given two values with a gap of 3 degrees so that there is no unnecessary changes in the configuration by just a change of 1 degree or so. Either the temperature has to go completely above 12 or come below 9. In between it stays where it is was last. The 3 degree gap is also because of inaccuracy in measurement of temperature by the sensors.

[@aviators6199]

Can u please upload a video on air condition sensors like temp sensor press and overheat sensors thank u

[@poh]

What do you want to know about them?

[@kedarpandya4]

Hi ... in abnormal configuration how is is air vented outboard .... as air is continuously introduced through the air conditioning duct?

[@poh]

The air conditioning air is added only to cool down or regulate the temperature because generally the blower or extract fault will be for these two reasons only. So once its under control the flow is automatically adjusted and the fault also disappears.

[@kedarpandya4]

@@poh Thank you

[@kedarpandya4]

Hi Can u please confirm if the air that goes to Cargo Underfloor eventually is exhausted overboard through the outflow valve?

[@poh]

Cargo underflow air is recirculated back to the avionics bay.

[@kedarpandya4]

Thanks

[@komalattri6416]

@@poh can u plz share related pdf

[@poh]

Which related pdf?

[@komalattri6416]

air for cargo ventilation is coming through avionics equipment ventilation through extract fan...???

[@EdisonNenger91]

awesome!! thanks!! it's very helpful!!

[@poh]

You're welcome!

[@bazokazoro4563]

Sir you said when extract override both fan continue running , are there an exception?

[@poh]

Exception as in?

[@bazokazoro4563]

still waiting for the answer ! +in close conf. when extract fan inop (override) where the extracted air overboard ?

[@poh]

Extract fan is never inop, it's fail operational. Nevertheless even if it stops, it doesn't mean it blocks all the air. Air keeps circulating.

[@bazokazoro4563]

Sorry sir once you put the p/b on override the system reverts to close conf. with extract fan fail and APU inop there is no circulation agree!​@@poh

[@sq8409]

Are you A320 type rated?

[@poh]

Yes

[@dukhishyamsahoo1976]

your video is very helpful. .

[@poh]

You're welcome!

[@mukeshalank7763]

Dear sir why some pushbuttons switch inn a320 having 2 dots.?

[@poh]

If no alert or system status is required, then two grey dots replace the fault light etc.

[@torrero0101]

Hi, what is the different between Avionic bay and avionics equipment?

[@poh]

Avionics bay is the common area between the zones. Avionics equipment specifically refers to the zone where computers are kept.

[@torrero0101]

@@poh Thanks very much. Another one. Regarding Abnormal operation. when you override both pushbutton switch Blower and Extract, why the extract fan is still runnning?

[@poh]

The pbs are mere method to reach a certain configuration and the override is not directly linked to the fan, the override is to do with overriding the capability of the aircraft to change configuration and keep it in one spot.

[@torrero0101]

@@poh Thank you

[@mohammadalajmi8612]

Why incase of smoke outlet not fully open to push more air outside

[@poh]

It may lead to loss of pressure of the aircraft immediately.

[@puneetkaur9163]

Pls give one example of temp. below ground threshold ?

[@poh]

When it is cold on the aerodrome.

[@puneetkaur9163]

I mean numerical value example.I am confused will it be less than 12 or 9 depending on trend of temp increasing or decreasing OR btn 12 and 9 ?

[@dglouis4354]

what is 'in flight threshold'??

[@poh]

A value used to assume aircraft in flight conditions! Whenever aircraft take off power is set its considered to be in flight for avionics ventilation system.

[@Bforbravo313]

Thank you very much

[@ferasalloush]

Thanks very good

[@poh]

You're Welcome! :) Stay tuned in and subscribed for regular updates! :D

[@flykaranvir]

Planes Over Head

[@arunimaprem8288]

Your videos are very very helpful! Thank you so much :)

[@poh]

+Phoenix You're welcome!

[@mpavankumar4662]

Thank you 😊

[@adilbaria8139]

Superb!

[@poh]

Thank you!

[@skmutsuddi]

Excellent!!

[@poh]

Thank you

[@robairtrader]

Awesome...

[@poh]

Thanks

[@mohammedpilot2335]

Thanks

[@rohanmishra6344]

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