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Top of Climb (T/C), Top-of-Descent (T/D), Start of Climb (S/C) or Start of Descent (S/D) for Step
Climb/Descent, Speed Limit (SPD LIM), deceleration to approach phase (DECEL)
‐ Time, speed, and altitude predictions:
TIME/SPD/ALT for all waypoints and pseudo-waypoints.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A318/A319/A320/A321 FLEET DSC-22_20-40-30 P 13/24
FCOM 19 AUG 10
CONSTRAINT SYMBOLS (STAR)
Applicable to: ALL
When a time speed or an altitude constraint is part of the vertical flight plan, it appears on the F-PLN
A page only at the time of insertion, or when predictions are not yet available.
Once available, the time speed and altitude predictions are displayed for all F-PLN waypoints: when
a speed or an altitude constraint is at a waypoint, a star symbol appears adjacent to the speed or
altitude prediction. If the star is magenta, the constraint is predicted to be matched. If the star is
amber, the constraint is predicted to be missed.
Note: If an altitude constraint is predicted as missed, the system tells you what will be the error at
the specific waypoint.
VERTICAL DEVIATION
Applicable to: ALL
During descent, the system indicates to the flight crew the vertical deviation from the computed
descent profile (PFD and MCDU) and predicts where the flight crew can rejoin it.
VDEV on the PFD and PROG page, predictions on the MCDU F-PLN page, symbols on the ND,
enable assess to the vertical position versus the computed flight profile.
OPERATION RULES CONCERNING PREDICTIONS
Applicable to: ALL
The flight crew must properly update the flight plan data during the flight, in order to obtain accurate
and meaningful predictions.
The flight crew should rely on the ND for short-term predictions. It indicates what the aircraft will do
under the currently engaged modes (selected or managed).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A318/A319/A320/A321 FLEET DSC-22_20-40-30 P 14/24
FCOM 19 AUG 10
The flight crew should rely on the MCDU for long-term predictions, when managed guidance is active
or about to be reengaged.
OTHER COMPUTATIONS
Applicable to:
ENGINE-OUT CASE
The FMGS computes an engine-out target speed for each flight phase. It computes an engine-out
maximum altitude at long-range cruise speed, and displays it on the PROG page.
When the aircraft loses an engine, it also loses predictions for the active flight plan, in the takeoff,
climb, and cruise phases. However, the system restores predictions for twin-engine operation in
the descent and approach phases.
Applicable to:
ENGINE-OUT CASE
The FMGS computes an engine-out target speed for each flight phase. It computes an engine-out
maximum altitude at long-range cruise speed, and displays it on the PROG page.
The new speed target becomes Green Dot in climb, and EO CRZ SPD in cruise.
The system computes the flight plan predictions down to the primary destination. If the aircraft
is above EO MAX ALT, the predictions are computed, assuming that a drift down descent will
immediately be performed to reach EO MAX ALT.
Applicable to:
,
,
MSN,,
4538,,
ENGINE-OUT CASE
The FMGS computes an engine-out target speed for each flight phase. It computes an engine-out
maximum altitude at long-range cruise speed, and displays it on the PROG page.
The new speed target becomes Green Dot in climb, and EO CRZ SPD in cruise.
The system computes the flight plan predictions in all phases (except takeoff phase) down to the
primary destination.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A318/A319/A320/A321 FLEET DSC-22_20-40-30 P 15/24
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
RECOMMENDED MAXIMUM ALTITUDE (REC MAX)
The recommended maximum altitude is the lowest of the maximum altitude that:
The aircraft ‐ can reach with a 0.3 g buffet margin
‐ The aircraft can fly in level flight at MAX CRZ rating
‐ The aircraft can maintain a V/S of 300 ft/min at MAX CLB thrust
‐ The aircraft can fly at a speed higher than Green Dot and lower than VMO/MMO
‐ The aircraft is certified at.
The REC MAX altitude is displayed on the PROG page.
Anti-ice is not taken into account for this computation. Refer to QRH graphs if icing conditions are
expected.
A maximum altitude using a 0.2 g buffet margin is also computed. It is not displayed, but the
system uses it to limit CRZ ALT entry.
　
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