A320 - Fuel System

[@eprn1n2]

The logic diagrams are great.

[@sharklet7779]

After cooling IDGs, fuel returns to the outer tank so to accommodate that fuel the feeding should takes place through inner tank and hence CTR tank feeding is auto stopped during slat extension, is this also correct?

[@poh]

Yes

[@jmhofilena5231]

Why do you need to consider your FL and Time at the FL for the gravity fuel feeding? Thanks

[@poh]

Because for a certain FL and time, and for a fuel type and engine, the fuel flow is affected due to temperature and density of air at that level. Hence for gravity to give you fuel you may require more density and hence will have to descend according to the manufacturers limits mentioned in the QRH.

[@piggerypork]

Excellent work! Thank you for these videos. Perhaps eventually a video on abnormals?

[@poh]

+piggerypork Thank you! Yeah it'll come with time.

[@hassansidhu666]

There’s a question in the quiz “APU is supplied fuel from the” and the answer according to the quiz is “center tank”, but whereas in the video at 02:09 tells that the fuel is supplied from the left tank to the APU, which one is correct?

[@poh]

Intially center tank pump 1 and then left wing tank. But both via left fuel feed line.

[@kartiksharma5051]

@@poh So sir shall we mark left fuel feed line / left tank /center tank which one correct if all three are in option ?

[@poh]

Left fuel feed line

[@annshirley6518]

Really helpful video.I have one doubt.Why does aircraft refuelling can happen only when batteries are on?

[@poh]

External power panel runs through it.

[@muneebzulfiqar6397]

Hey. Why center tanks dont have suction valves? Due to their contamination?

[@poh]

It was a design feature, which has been now changed by have jet pumps in center which feed the inner tanks on the NEO aircraft.

[@9611279300]

Hi , what do you meant by contamination and cavitation in the centre tank in Auto mode ?

[@poh]

Contamination is sediments collection Cavitation is lack of ability of centre tank to provide fuel continuously via gravity since no suction valves (new models have it now).

[@jmhofilena5231]

Why is fuel consumption increased if you have ac1 bus fault or in D.C 1+2 fault? Thanks

[@poh]

Hi! So yeah in both the cases some Flight computers are inop or some flight control surfaces. For example AC1 bus fault has SPLR 3 inop which has a penalty of 10% on fuel. Similarly on DC1+2 fault there are SPLR 1+2+5. During the flight, the spoiler(s) may gradually extend and increase the fuel consumption.

[@jmhofilena5231]

Thank you.

[@blink882]

Excellent video as usual, one question not specifically on your video but about the fuel system. In the Gravity Fuel Feed checklist in the QRH why does it say 'when reaching gravity feed ceiling X FEED OFF'. Wouldn't the cross feed already be off? Thank you for your opinion!

[@poh]

Hey there, these are all legal stand points actually meaning, IF for WHATEVER reason X-Feed was on earlier, then put it off now. Like maybe you would have carried out fuel imbalance or fuel leak checklist prior to this due to some situation.

[@blink882]

@@poh Yes of course, you are right, I forgot about the legal stand points. Thanks for clearing that up

[@foysalbabu6211]

What is the purpose of defuel/xfr vlv?

[@poh]

Its empty the tanks completely or transfer between tanks by engineering

[@devenessrao2729]

Why does the center tank is the only 1 has a high flammability exposure? is it because of the high temperatures as it sits closes to the engines?

[@poh]

More cables and components around the center tank generating heat etc.

[@devenessrao2729]

@@poh and why can u refuel only when the battery power is available ?

[@poh]

Because the refueling panel runs on batteries.

[@devenessrao2729]

@@poh thank you sir

[@sagarthakkar6494]

Good one sandesh

[@poh]

+Sagar Thakkar Thank you

[@felixprince7759]

Hello sir , pls clear my doubt With fuel in the center tank, the CTR TK MODE SEL push button selected to AUTO and CTR TK PUMP push buttons ON (lights out), which of the following conditions cause the center tank fuel pumps to stop?

[@poh]

The moment you take slats during taxi the center tank fuel pumps stop.

[@kummarasreenath2897]

Hii. Thanks for valuable infor. Videos. I have doubt 1.aircraft refuelled only when battery power is available.,why? 2.why left tank pump supplies fuel to APU or why not right tank pump? Is there any particular reason for that

[@poh]

Because the preselector refueling panel works on battery. There is no reason for APU to be supplied by left fuel feed line. Its just a system design.

[@hirantha12345]

I want just to know NOT for practical> How the fuel in Center tank transfer to Wing tanks I checked the AMM but ni diagrams there are check valves in all fuel pumps so how could it be possible to transfer fuel from CTR to WING tanks only using cockpit overhead panel? Thank you!

[@poh]

Fuel transfer is done by engineering using the fuel panel outside. I've no idea about it since pilots are not authorised to do fuel transfer rather cannot do either.

[@hirantha12345]

@@poh, My team senior engineer did fuel transfer from centre tank to wing tank he asked me how to do that without switching Defuel /Transfer switches outside panel I checked with the AMM but the diagrams make me confused because there are check valves in each fuel pumps

[@poh]

Pressing the MODE SEL to MAN position will open the center tank transfer valves and the inner tank will create a suction will transfer the fuel. This is what I can think of in aircraft with jet pumps instead of center tank pumps.

[@hirantha12345]

@@poh yes I think the same should be JETPUMPs

[@akenan8]

Hi. Thanks for the great videos. I have a question regarding CTR pumps AUTO mode. What is the reason for running ctr pumps for 2 minutes after engines start?

[@poh]

+K A To check any signs of contamination and cavitation in the centre tank. If the supply and pump pressure is normal they go off after 2 minutes

[@akenan8]

thanks

[@poh]

+K A You're welcome and thanks!

[@sourabhjain9075]

Sir in the newer A320 there are no center tank pump . Can you explain how fuel is than taken out from centre tank.

[@poh]

Jet pumps are there basically it works on pressure differential concept which suck the fuel out of the centre tank.

[@sourabhjain9075]

@@poh Thank you Sir 🙂

[@siddharthkulkarni625]

So what is the procedure to tackle fuel imbalance condition?

[@poh]

Its there in QRH and need not be remembered.

[@radhakrishnannair2143]

My doubt center tank & wing tank no connection at all . All tanks sealed off suprate. How contamination transfer from tank to tank as long as transfer is not done .

[@poh]

Yes in case transfer is done by engineering team which pilot may not be aware of. In the hanger etc.

[@calniper]

Fantastic explanation mate!!! well done.

[@poh]

Thank you!

[@marthandas840]

Can you explain about defuelling ??? When do you do it ?? Defuelling happens at the same phase as fuelling ????

[@poh]

Defueling is not a pilot procedure. It is done by engineering only in certain cases such as some issue in tanks and they want all the fuel out of the tank.

[@zahrarekiza706]

can you please make a video about navigation and EGPWS? plz plz

[@poh]

There you go, special upload for you!

[@zahrarekiza706]

thank you sooooooooo soooo muuuuuuuch

[@poh]

Don't forget to like the Facebook page! 🙂

[@israelkobe]

Yourk iss

[@zachnoll4968]

Hi, I was just wondering where you get this information? Using it for a research paper and want to make sure I have a credible source. Thanks!

[@poh]

All this is from the FCOM only

[@gildarajesh]

Thank you!

[@poh]

+rajesh gilda Welcome

[@rickydelacruz1192]

Hello Sir,can you make a video how to do tranferring fuel from 1 tank to anaother tank. Thanks!

[@poh]

That is for an AME to do, unfortunately I'll not be able to do that!

[@mohammedpilot2335]

Thanks

[@mdmahtabkhan8753]

Sir how much fuel capacity in A-320

[@poh]

19 tonnes

[@mohdabduljabbar7716]

please kindly let us knw how to transfer fuel from one side to another side by manually.

[@poh]

Engineers can do it not pilots.

[@myvlog....1850]

Hindi mai banao

[@poh]

I can't do that, sorry!