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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 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 the thrust levers are set between IDLE and MCT.
A/THR operating sectors - one engine inoperative
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
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 ).
2 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.
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
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
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.
It should be noted that, when the thrust levers are set back to IDLE and A/THR set to off: The A/THR can be reactivated by pressing the pushbutton on the FCU, and returning the thrust levers
to the applicable detent. The thrust levers should be immediately returned to the applicable detent, in order to avoid an ECAM "AUTO FLT A/THR LIMITED" message
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A330/A340 机组训练手册 FCTM Flight Crew Training Manual 1(16)
