Thanks for your answer.
I just love Airbus!
1) Ok, but I still don't get it.
If ELAC is controling pitch and A/THR is controlling thrust, do you mean that if A/THR is ON and if we reach Vprot, ELAC will just pitch down at a certain programmed value and A/THR will keep trying to maintain the selected speed but if A/THR is OFF, when we reach Vprot, ELAC will pitch down and manage itself the Vprot? So:
A/THR ON = ELAC pitches down at X° (programmed) - target speed managed by A/THR.
A/THR OFF = ELAC pitches down and maintains Vprot.
Am I right??
2) What is EIU's use?
3) Ok, A/THR will send X fuel amount to FADEC.
A/THR is part of the FMGS. FMGS knows the target speed.
Ok so you are saying this:
If A/THR is in SPEED/MACH mode, AP/FD control pitch.
I really don't understand then...what do you mean by vertical trajectory??
Do you mean to say what I have written before?
Well, for me, If A/THR is in SPD mode, pitch is then controlled by FMGS.
If A/THR is in CLB/DES mode, pitch and thrust are controlled by A/THR. What is FMGS doing?? He always controls the trajectory...A/THR never controls HDG/CRS.
How can AP/FD control a target SPD? Or do you mean, FD/AP controls pitch?
Don't get your last F-COM quote.
Please explain,
EDIT:
When AP/FD manages vertical trajectory: Does that mean that AP/FD are managing pitch? Or is it simply the route?
When A/THR manages a target SPD/MACH: Does that mean that A/THR is in CLB/DES mode and is pitching up/down to maintain target speed? So - to make it shorter - A/THR controling pitch?
When A/THR is controlling thrust: Well, that's speed mode, isn't it?
When AP/FD is controlling a target SPD/MACH: ???????? A/THR will always control speed (by pitch or by thrust). So what is this???
Thanks a lot