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The question says it all. While reading I came across this that we can under no circumstances use APU bleed air for supplying wing anti ice? Any reason?

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On multiple PPRUNE threads they incorrectly say:

The APU bleed is much cooler than the engine bleed system, and would be ineffective for WAI.

But the reason is:

The APU bleed temperature is unregulated and thus could damage the wing slats if used for anti-ice.

enter image description here

Highlight shows regulation of engine bleed temperature.

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    $\begingroup$ Great thanks soo much. A lot of these questions arise in my mind due to they grey areas present in Airbus manuals. $\endgroup$ – Jai Aug 20 '17 at 6:29

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