A318/A319/A320/A321 机组训练手册 FCTM Flight Crew Training Manual(22)

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In other words, the Thrust Lever Angle (TLA) should not be used to monitor correct A/THR operation. Neither should the thrust lever position of a conventional autothrottle, be considered a cue because, in many hazardous situations, the thrust lever position can be misleading (e.g. engine failure, thrust lever jammed).
the TLA determines Max thrust for the A/THR
 
NORMAL OPERATIONS
The A/THR can only be active, when the thrust levers are between IDLE and the CLB detent.
 

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

When the thrust levers are beyond the CLB detent, thrust is controlled manually to the thrust lever Angle, and the A/THR is armed (A/THR appears in blue on the FMA). This means that the A/THR is ready to be re-activated, when the flight crew sets the thrust levers back to the CLB detent (or below).
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 CLB or LVR CLB flashes in the first FMA column. This is 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.
 

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

A/THR operating technique: 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 ).
3 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
　
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