Thanks for reply.
There are still two questions in my mind.
1) Some people say flaps shouldn't be used for slowing the aircraft. but when i look the values for 737ng, after each flap selection, you don't need to reduce thrust to reduce speed, in contrast you have to increase thrust a little bit.
My understanding is extending flap creates drag and drag slows the aircraft. my question is why do some people say don't use flaps to slow the aircraft? Am i missing something?
2) My second question is what is balloon effect? In one thread there are lots of different explanations on balloon effect.
http://www.pprune.org/tech-log/253852-flap-2-a320.html
Could you tell me what balloon effect is and how do you handle with it?
Thanks.