"Loss of an FCU could affect an associated ADP."
We're not referring the the 747-400 lavatory "FCU" (Flush Control Unit) here, are we CJ? <img src="confused.gif" border="0">
I guess, not... I don't think there's a link between these and the ADP's... Unless (using a bit of poetic licence here )....
Person flushes toilet during flap retraction, activating the electric blowers for the toilet vacuum system. The engine spools up to compensate for the extra draw on the electrical generators, momentarily increasing the output of the engine bleed air system which causes the ADP to run faster....
Cheers.
Q.