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 -------------------------------------------------------------------------------| AP ENGAGEMENTS | FD ENGAGEMENTS | A/THR ENGAGEMENTS | FMGC HAVING | |------------------|------------------|-------------------| PRIORITY | | 1 | 2 | 1 | 2 | 1 | 2 | | |--------|---------|---------|--------|---------|---------|-------------------| | 1 | -| -| -| -| -| 1 | |--------|---------|---------|--------|---------|---------|-------------------| | 0 | 1 | -| -| -| -| 2 | |--------|---------|---------|--------|---------|---------|-------------------| | 0 | 0 | 1 | -| -| -| 1 | |--------|---------|---------|--------|---------|---------|-------------------| | 0 | 0 | 0 | 1 | -| -| 2 | |--------|---------|---------|--------|---------|---------|-------------------| | 0 | 0 | 0 | 0 | 1 | -| 1 | |--------|---------|---------|--------|---------|---------|-------------------| | 0 | 0 | 0 | 0 | 0 | 1 | 2 | |--------|---------|---------|--------|---------|---------|-------------------| | 0 | 0 | 0 | 0 | 0 | 0 | 1 (if FMGC valid) | -------------------------------------------------------------------------------
NOTE : - means : indifferent state
____ In cruise phase and on condition there is at least one AP/FD engaged, the FMGC which has priority imposes the cruise modes active and armed to the FMGC which has no priority.
 D. Disengagement Principle The disengagement of a lateral mode is caused by the engagement of a new lateral mode. The disengagement of a longitudinal mode is caused by the engagement of a new longitudinal mode.
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 2. System Description
__________________
 A. Speed Control In flight, the AFS ensures the permanent control of the SPEED/MACH parameter either through the automatic thrust control or through the AP/FD longitudinal guidance. The purpose of the control is to acquire and hold a reference speed or Mach or to monitor the evolution of this parameter within an authorized zone, in the case of follow-up of the descent path at reduced thrust. The speed control is:
 -managed when the speed or Mach reference does not come from the FCU. In this case, the speed triangular symbol is magenta on the PFD speed scale.
 -selected when this reference is the value displayed in the SPD MACH window of the FCU display. In this case, the speed triangular symbol is cyan on the PFD speed scale.
 (1) Selected Speed Control
 It is activated:

 -upon energization of the FMGC in flight
 -five seconds after lift-off, when no FM speed reference is available and the PITCH TAKE OFF, PITCH GO AROUND, GS TRACK and LAND TRACK modes are not engaged
 -upon disengagement of two AP/FDs on condition that the aircraft is not in approach phase
 -
through pull action on the SPEED/MACH selector knob, on the ground with engines stopped or in flight (5 s after lift-off) (Ref. Fig. 001) (item C)

 -
through FMS request (acceptance of a preset value upon FMS phase change Ref. NOTE 1)

 -upon the loss of FM speed reference in flight when the PITCH TAKE OFF, PITCH GO AROUND, GS TRACK and LAND TRACK modes are not engaged.
 The selected control is lost:
 -when the automatic speed control is selected
 -
upon engine start-up on the ground

 -
upon engagement of the AP or FD on the ground.

 NOTE : The speed is preset on the MCDU.
____
 NOTE : It is not possible to select selected speed control in the
____ configuration : ground (takeoff), engines running, and FD engaged.
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 Speed Control
 Figure 001
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 NOTE : The request for switching to selected speed will not be
____ accepted if the SRS mode is engaged and the altitude selected on the FCU is lower than the aircraft level.
 (2) Managed Speed Control The speed control can be managed only if a speed reference is available in the FMGC. The nature of this reference is dependent on the flight phase (V2, V Ref., speed hold reference in climb, descent and cruise). It is activated: - on the ground:
 . upon engagement of the AP or FD, with V2 available . upon engine start-up with FD engaged and V2 available . upon selection of V2 on the MCDU, with the FD engaged.
 - on the ground or in flight: . when the SRS control law is activated due to the TAKE OFF or GO AROUND modes
 NOTE : At takeoff, this mode cannot be engaged if V2 is not
____ available. . when you push the SPD/MACH selector knob and on condition that the reference which corresponds to the flight phase is available in the FMGC . when the Expedite mode is engaged.
 It is lost when you switch to the selected speed control and on the ground, when the TAKEOFF, GO AROUND AND TRACK modes are not engaged and when the validity of V2 disappears.
　
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