ref. AA's quote from Vol 2
"....After page selection, the FMC accounts for wing and engine anti-ice, air conditioning, and engine bleed of the operating engine"
This suggests the FMC get inputs from these systems and adjusts accordingly. Two questions.
1. Nothing like a bit of empirical evidence so any chance someone could put the eng anti ice on and see if it reduces the altitude. Would do it myself but my company went into administration 17/12/09.
2. If there is normally a 300' difference when both bleeds / packs are on/APU bleed off.What is the cause of this?