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Curiously enough, FUEL INNER(OUTER) HI TEMP ECAM will be triggered when inner temp is 54, or outer 60, this time tellig you to delay takeoff
Don't know what the fuel feed sequence is on the 320, but I think fuel will go from outer tk to inner tk to engine, is that right?
If so the 60 degrees is the limit because as long as it is in the outer tk it will not go to the engine anyways. It has enough time to cool down below the 54 degrees before it transfers to the inner tank.
From my FCOM
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Hot fuel in the engine can lead to engine stall, engine shutdown, or engine overspeed.
So for ops reasons it can be allowed to have an higher temp in the smaller (easier to heat up) outer tank, as it doesn't feed the engine.
What you think.