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The AP/FD will not consider any MCDU descent altitude constraints and will fly an unrestricted descent down to the FCU selected altitude.
If the crew wishes to steep the descent down, OP DES mode can be used, selecting a higher speed. Speedbrake is very effective in increasing descent rate but should be used with caution at high altitude due to the associated increase in VLS.
If the pilot wishes to shallow the descent path, V/S can be used. A/THR reverts to SPEED mode. In this configuration, the use of speedbrakes is not recommended to reduce speed, since this would lead to thrust increase and the speed would be maintained.
MODE REVERSION
Criteria: SA
1 Applicable to: MSN 0045-0499
If a high V/S target is selected, the autopilot will pitch the aircraft down to fly the target V/S. Thus the aircraft will tend to accelerate, while A/THR commands idle thrust to try to keep the speed. When IAS will reach a speed close to VMO or VFE, the descent mode will revert to OP DES to regain the initial target speed.
MODE REVERSION
Criteria: P4320, SA
Applicable to: MSN 1668-1718
If a high V/S target is selected (or typically after a DES to V/S reversion), the autopilot will pitch the aircraft down to fly the target V/S. Thus the aircraft will tend to accelerate, while A/THR commands idle thrust to try to keep the speed. When IAS will reach a speed close to VMO or VFE, the autopilot will pitch the aircraft up, so as to fly a V/S allowing VMO or VFE to be maintained with idle thrust.
 

  NORMAL OPERATIONS
DESCENT
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

MODE REVERSION
Criteria: P4320, P7790, SA
2 Applicable to: MSN 2593-4078
If a high V/S target is selected (or typically after a DES to V/S reversion), the autopilot will pitch the aircraft down to fly the target V/S. Thus the aircraft will tend to accelerate, while A/THR commands idle thrust to try to keep the speed. When IAS will reach a speed close to VMO or VFE, the autopilot will pitch the aircraft up, so as to fly a V/S allowing VMO or VFE to be maintained with idle thrust.
Triple click will be triggered.
DESCENT CONSTRAINTS
Criteria: SA
3 Applicable to: MSN 0045-0499
Descent constraints may be automatically included in the route as part of an arrival procedure or they may be manually entered through the MCDU F-PLN page. The aircraft will attempt to meet these as long as DES mode is being used.
The crew should be aware that an ATC "DIR TO" clearance automatically removes the requirement to comply with the speed/altitude constraints assigned to the waypoints deleted from the F-PLN. Following the selection of HDG, DES mode will switch automatically to V/S, and altitude constraints will no longer be taken into account.
DESCENT CONSTRAINTS
Criteria: P7373, P7519, P7666, SA
4 Applicable to: MSN 1668-4078
Descent constraints may be automatically included in the route as part of an arrival procedure or they may be manually entered through the MCDU F-PLN page. The aircraft will attempt to meet these as long as DES mode is being used.
　
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