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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