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flight crew sets the thrust levers back to the CLB detent (or below).A/THR appears in blue on the FMA.
A/THR operating sectors all engines operating
 
AT TAKEOFF
The thrust levers are set either full forward to TOGA, or to the FLX detent. Thrust is manually controlled to the TLA, and A/THR is armed. The FMA indicates this in blue.
AFTER TAKEOFF
When the aircraft reaches THR RED ALT, the flight crew sets the thrust levers back to the CLB detent. This activates A/THR. MAX CLB will, therefore, be the maximum normal thrust setting that will be commanded by the A/THR in CLB, CRZ, DES, or APPR, as required.
THRUST LEVER(S) BELOW THE CLB DETENT
If one thrust lever is set to below the CLB detent, the FMA triggers a LVR ASYM message, as a reminder to the flight crew (e.g. this configuration might be required due to an engine’s high vibration level). However, if all thrust levers are set to below the CLB detent, with the A/THR active, then the ECAM repeatedly triggers the AUTO FLT A/THR LIMITED caution. This is
 

  OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

because there is no operational reason to be in such a situation, and to permanently limit A/THR authority on all engines. In this case, all thrust levers should either be brought back to the CLB detent, or the A/THR should be set to OFF.
OPERATIONS WITH ONE ENGINE INOPERATIVE
The above-noted principles also apply to an one-engine inoperative situation, except that A/THR can only be active, when thrust levers are set between IDLE and MCT.
A/THR operating sectors - one engine inoperative
 
In case of engine failure, the thrust levers will be in MCT detent for remainder of the flight. This is because MCT is the maximum thrust that can usually be commanded by the A/THR for climb or acceleration, in all flight phases (e.g. CLB, CRZ, DES or APPR ).
5 TO SET AUTOTHRUST TO OFF
How to set A/THR off
 
1) USE OF INSTINCTIVE DISCONNECT (I/D) PUSHBUTTON
If the I/D pushbutton is pressed when the thrust levers are in CL detent, thrust will increase to
MAX CL. This will cause an unwanted thrust increase and may destabilize the approach.
 

  OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

Therefore, the recommended technique for setting A/THR to off is:
‐ Return the thrust levers to approximately the current thrust setting, by observing the TLA symbol on the thrust gauge
‐ Press the I/D pushbutton
This technique minimizes thrust discontinuity, when setting A/THR to off.
recommended technique to set A/THR off
 
2) THRUST LEVERS SET TO IDLE
If thrust levers are set to IDLE, A/THR is set to off. This technique is usually used in descent, when the A/THR is in THR IDLE, or at landing. During flare, with the A/THR active, the thrust levers are set to the CLB detent. Then, when thrust reduction is required for landing, the thrust levers should be moved rapidly and set to the IDLE stop. This will retard thrust, and set A/THR to off. As a reminder, the "RETARD" aural alert will sound. In flare, this aural alert will occur at 20 ft, except in the case of autoland, where it occurs at 10 ft.
　
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