Dear Fredgrav, thank you.
you stated very well, that I missed the weight and idle thrust relation and the bleed air as well. normaly we just can learn what books say, yet no book says what you commented above. so I see that discussing with users is very useful.
also you are right about the comment to my question, I have lots of thing in my mind to ask actually, this is why I messed like that. please, all of you excuse me.
about the flap, what I really wandered is when do you initiate to extend the flaps (after final approach point ?) and how flap degrees are configurated due to speed, altitude etc (also when do you extend the landing gears).
good days.