SPD/MACH Law
 Figure 003
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 A/THR Basic Loop
 Figure 004
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 D. Realization of Control Laws and Modes (Ref. 22-31-00) (Ref. Fig. 003) The processors on the command side of the FMGC calculate the mode logic, control laws, the A/THR basic loop and the precommand of the SPEED/MACH mode. The command and monitor sides calculate the Alpha Floor Protection logic. The comparison of the results is taken into account at level of the FMGC internal monitoring.
 E. Indications on the FMA (Ref. Fig. 005) During A/THR operation, different messages are displayed on the FMA. The FMA is located on the upper section of the Primary Flight Display (PFD). This area is divided into 5 columns of 3 lines each, on which several FMGC operations are displayed. The right column shows the engagement status. The left column shows different A/THR modes and actions required.
 (1)
 A/THR engagement status The A/THR of message is displayed on the 3rd line of the right column in one of the two colors below.

 (a)
 White When the A/THR is engaged and active: the autothrust system controls the engines.

 (b)
 Cyan When the A/THR is engaged but not active: the two engines are controlled by the position of the throttle control levers and by the ECUs/EECs.

 (2)
 A/THR modes The A/THR modes are displayed on the left column if the A/THR is engaged. Two different types of indications are displayed with appropriate colors.

 (a) On the first line and second line, green and white messages indicate A/THR mode when:
 -
the A/THR function is override by a throttle control lever set beyond the MCT position

 -
the AP/FD active modes are: takeoff, landing go around, V/S or FPA, OPEN CLB, OPEN DES

 -
the thrust is not consistent with the engine configuration (engine failure or not).

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 A/THR Indications
 Figure 005
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 (b) On the third line, white flashing messages for action to be taken by the crew on the throttle control levers and amber messages for indication which requires special attention.
 (3) Message meaning
 (a)
 On the first line and second line:

 -
MAN TOGA: A/THR is engaged, not active one throttle lever at least in TO/GA position, the thrust is under the control of the ECUs/EECs.

 -
MAN FLX 50: A/THR is engaged not active . The takeoff is performed in FLX TO with a FLEX TO temperature (50 deg. C for example), selected on the MCDUs. One throttle control lever at least is in FLX TO/MCT position, the other one is in the same position or below.

 -
MAN MCT: A/THR is engaged, not active. All throttles in MCT position.

 -
THR MCT: A/THR is active in thrust mode and the most advanced throttle lever is in the MCT position (single-engine configuration).

 -
THR CLB: A/THR is active in thrust mode and the most advanced throttle control lever is in the CLB position. THR LVR: A/THR is active in thrust mode. The throttle control levers are neither in the CLB nor in the MCT position.

 -MAN THR: A/THR is engaged and not active and the most advanced throttle control lever is between FLX TO/MCT and TO/GA position or between CL and FLX TO/MCT.
 -THR IDLE: A/THR is active in minimum thrust.
 -SPEED: A/THR is active in SPEED mode.
 -MACH: A/THR is active in MACH mode.
 -A. FLOOR: A/THR is active with the Alpha Floor protection is active.
 -TOGA LK: A/THR is active with the Alpha Floor protection active but the Alpha Floor detection from the FAC is no longer present (TOGA LK = TOGA LOCK).

 (b)
 On the FMA third line:

 -
LVR CLB: this white message flashes to inform the crew to set the throttle levers to the CLB position to permit normal A/THR in dual-engine configuration.

 -
LVR MCT: this white message flashes to inform the crew to set the throttle to the MCT position to permit normal A/THR in single-engine configuration.

 -
LVR ASYM : only one throttle control lever is in the MCT or CLB gate, resulting in asymmetrical thrust.