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A320 fuel system - different capacities

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A320 fuel system - different capacities

Old 6th Aug 2019, 08:20
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A320 fuel system - different capacities

Hi,

I have here several documents, all claiming to be from the A320 variant (not A321 / A319).
However, they give different volumes / weights for the fuel tanks.

I found two that agree giving a total of 7804 litres (within 1 litre of the other source) while the other document gives a total volume of 7979 litres for the inner / outer tank.

The center tank is also different at 8250 litres in one and 8078 litres in the other.
Is this indicating that newer A320's have a higher capacity in their wing tanks or is there any way to account for this difference? Perhaps it is unusable fuel?

Last edited by Legoboyvdlp; 6th Aug 2019 at 11:34.
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Old 6th Aug 2019, 09:23
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Originally Posted by Legoboyvdlp View Post
Hi,

I have here several documents, all claiming to be from the A320.
However, they give different volumes / weights for the fuel tanks.

I found two that agree giving a total of 7804 litres (within 1 litre of the other source) while the other document gives a total volume of 7979 litres for the inner / outer tank.

The center tank is also different at 8250 litres in one and 8078 litres in the other.
Is this indicating that newer A320's have a higher capacity in their wing tanks or is there any way to account for this difference? Perhaps it is unusable fuel?
Our Neo airplanes have slightly different capacities. There are also options for 2 or 3 additional tanks.
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Old 6th Aug 2019, 10:11
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Newer ones have slightly lower capacity. Our CEO sharklets have slightly less than the wingtip fence version and the NEO has slightly less than both older models. Note that the NEO burns less fuel so its range is not affected by the minor difference in capacity.
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Old 6th Aug 2019, 11:28
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Ok. Thank you for your responses. Do those figures I quoted match any variant of sharklets / NEO / CEO?
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Old 6th Aug 2019, 12:49
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FWIW, the 7804 per side and 8250 centre match the CEO A319.
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Old 6th Aug 2019, 12:55
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In our fleet from our FCOM:

All value in liters.

A319& A320 CEO: Outer Tank: 880*2 Inner Tank: 6924*2 and Center Tank: 8250
A320 NEO: Outer Tank: 867*2 Inner tank 6917* 2 and Center tank: 8248

NEO aircraft use jet pumps ISO center pumps same as the A321. Not sure it has any effect on the fuel capacity tho.

A321 CEO and the one with sharklets have the exact same fuel capacity: 8200 in the center tank.
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Old 6th Aug 2019, 13:35
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That's interesting -

ok - source one says:
6924 + 880 litres for the wing tank + 190 litres for the surge tanks which gives a total of 7995 in each wing. It also shows 8078 litres for the center tank which all calculated at 6.7 lbs / us gallon gives 42585 lbs total.
Total FOB is given at 41291 which I presume is the useable fuel only, giving 1293 lbs of extra fuel. If 670 litres of that is the surge tanks, then 623 litres is the unusable fuel.

Source two says:
7099 + 880 litres for the wing tank giving 7979 litres total. Adding another 190 gives 8169 in each wing. It also shows 8250 litres for the center tank, which all calculated at 6.7 gives 43519 lbs total. At 6.5 as given in the source, this gives 42550 lbs.This is within 30 lbs of the first source -- but only when calculated at a lower density.

Source three makes it clear, quoting certain MSNs. Looking these up it appears that there are indeed different total fuel capacities, three options shown in this source are:
- 880 + 6924 + 8250 - total 23858 litres --> 41284 lbs or 41939 with surge tank (A319 / A320)
- 880 + 7099 + 8250 - total 24209 litres --> 41893 lbs or 42550 with surge tank (A319 / A320)
- A321 variant with just one wing tank

So - my question would be is there any pattern to the difference between the two A319 / A320 options (age, winglets?) and what about the value of 8078 litres quoted for the center tank in the first source?

And am I correct in thinking that Total FOB is only useable fuel - that is, surge tanks + about 623 litres in the other tanks is unusable?

And JET A-1 surely is 6.7 lb / us gallon anyway - why use 6.5?


A319& A320 CEO: Outer Tank: 880*2 Inner Tank: 6924*2 and Center Tank: 8250
A320 NEO: Outer Tank: 867*2 Inner tank 6917* 2 and Center tank: 8248
Thank you!

Last edited by Legoboyvdlp; 6th Aug 2019 at 14:09.
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Old 10th Aug 2019, 15:51
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Different fuel volume in inner tank is due to cancelled dry bay in wing box on CFMI planes.
You can find details in A320 fam. EASA certification data sheet.
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Old 11th Aug 2019, 15:16
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Link to EASA certification data sheet ...
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