rich49
16th Jun 2003, 04:55
Hi all,
Could someone take the time please to explain the A/THR on the Airbus? I have a complete A340 FCOM from Airbus and I still can't understand one point, it's doing my head in!
I understand most of it, I will explain some of it and then ask some questions.
So: The A/THR can be ARMED by: On the ground: pushing the A/THR button when the engines are powered down or by moving the TL to the FLX/MCT or TOGA detents OR: In Flight: By pushing the A/THR button when the TL are OUT of the ACTIVE range or by moving the TL past the CLB detent.
The A/THR can be ACTIVE by: pushing the A/THR button whilst the TL are INSIDE the ACTIVE range or by moving the TL between IDLE and the CLB detents but only if the A/THR is ARMED first. When the A/THR is active the thrust or speed is controlled by the various computers (lets not go into this one yet!) upto either: a)the max TLA or b) the detent.
Of course the thrust may be controlled manually were the thrust is proportional to the TLA provided the A/THR is not active or armed, and if the levers are moved into a detent then the thrust is set to the detent value set in the FMGC.
SO: my question is this:
I want to control the thrust manualy, I command 50% power so I move the TL half way up the quadrent. Fine so far, but then I want maximum power so I move the TL to the TOGA detent, the power goes to max and the A/THR arms itself (as above). Then I want to bring the power back down again and resume manual control but as I bring the TL back down into the active range (beteen CLB and IDLE), because the A/THR is ARMED first it now goes to ACTIVE.
So in other words I keep having to push the instinctive disconect buttons when controlling the thrust manually if I go to full power and back.
Could someone explain?
Cheers
Ric
Could someone take the time please to explain the A/THR on the Airbus? I have a complete A340 FCOM from Airbus and I still can't understand one point, it's doing my head in!
I understand most of it, I will explain some of it and then ask some questions.
So: The A/THR can be ARMED by: On the ground: pushing the A/THR button when the engines are powered down or by moving the TL to the FLX/MCT or TOGA detents OR: In Flight: By pushing the A/THR button when the TL are OUT of the ACTIVE range or by moving the TL past the CLB detent.
The A/THR can be ACTIVE by: pushing the A/THR button whilst the TL are INSIDE the ACTIVE range or by moving the TL between IDLE and the CLB detents but only if the A/THR is ARMED first. When the A/THR is active the thrust or speed is controlled by the various computers (lets not go into this one yet!) upto either: a)the max TLA or b) the detent.
Of course the thrust may be controlled manually were the thrust is proportional to the TLA provided the A/THR is not active or armed, and if the levers are moved into a detent then the thrust is set to the detent value set in the FMGC.
SO: my question is this:
I want to control the thrust manualy, I command 50% power so I move the TL half way up the quadrent. Fine so far, but then I want maximum power so I move the TL to the TOGA detent, the power goes to max and the A/THR arms itself (as above). Then I want to bring the power back down again and resume manual control but as I bring the TL back down into the active range (beteen CLB and IDLE), because the A/THR is ARMED first it now goes to ACTIVE.
So in other words I keep having to push the instinctive disconect buttons when controlling the thrust manually if I go to full power and back.
Could someone explain?
Cheers
Ric