Originally Posted by
Grlazos
You are climbing, at FL200 you have an ECAM for Left tank pumps low pressure. The procedure states, xfeed on and pumps off. So you do that, you make a fordec and you say I have the fuel to continue to my destination because it's tankering, so I can easily climb at FL350 stay there for 30 minutes and still have plenty of fuel in the right hand side of the wing. So you do that.
Hi!
Yes, but make sure You take into consideration negative Gs and the unbalance you will eventually create as a result of burning fuel only from one side. Have a look at
This answer.
Originally Posted by
Grlazos
The procedure states, that WHEN FUEL OF THE AFFECTED WING NEEDED go for the gravity fuel feeding procedure. So you open the QRH and you do the checklist. You put the XFEED OFF because it states when reaching gravity fuel feed ceiling put it off, so at that moment the right hand engine is taking fuel from the right hand from the pumps, the center tank is empty and the left hand engine (the one without pumps) takes fuel through gravity forces so it continue to run.
Then, you go to the next line which says, If no fuel leak and with one engine running (fed by gravity) - which is our case - :
Actually it is not your case. It would be your case if you had lost engine number 2.
Airbus wants to ensure that if you end up single engine without fuel pumps on the live engine side, you maximize the chances of feeding that engine.
Originally Posted by
Grlazos
Now the questions for the things that aren't clear to me.
1) This sentence: If no fuel leak and with one engine running (fed by gravity), assumes that you may have have 1 engine live (fuel pumps working) and the other fed by gravity - so in general 2 engines working,
No, actually it does mean with only one engine running
If you have both engines running, happy days, your checklist is finished.
Originally Posted by
Grlazos
2) Also, the FCOM/QRH has a gray zone about the deaeration of the fuel. If you search by your own, you know why the limitations are there, you learn about Henry's law and etc. But it doesn't specify at any point if the deaeration needs the fuel pumps to work in order for it to happen or not. So, this is a process that happens once the pumps are working on take off because the initial force has been given and it continues by itself OR you need the fuel pumps to work in order for the pressure and all that to be supplied and the air to deaerate?
Let me quote you a very good explanation from
vilas that uses the 2 things that as a pilot I like the most: fuel and beer!
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