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preplanned lateral and vertical flight plans.
The predictions displayed on the ND assume that the aircraft will continue to operate in the modes
(selected or managed) that are currently active.
As long as the aircraft is flying the flight plan under managed guidance, the predictions on the MCDU
will match those on the ND.
If the flight crew does not fly the flight plan, the MCDU predictions assume that:
The flight ‐ crew will fly back towards the flight-planned route
‐ The flight crew will immediately resume flying the FMGC managed modes.
If the flight crew does not fly the managed speed profile, the MCDU predictions assume that they will
maintain the selected speed until they reach:
‐ In the climb or descent phase, the next speed limit or speed constraint if any, or next phase
‐ In cruise, the top of descent.
Then, the predictions assume that the flight crew will revert to managed speed.
COMPUTATION OF PREDICTIONS
Applicable to:
The system calculates various predictions for the active flight plan and updates them continually
during flight as functions of:
Revisions ‐ to the lateral and vertical flight plans
‐ Cost index
‐ Current winds and temperature
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 2/24
FCOM 19 AUG 10
‐ Present position versus lateral and vertical flight plans
‐ Current guidance modes
‐ Speed control (managed/selected).
The MCDU and the ND show these predictions, each of which is based on specific assumptions.
Note: During computation, prediction fields on the MCDU pages display dashes.
COMPUTATION OF PREDICTIONS
Applicable to:
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The system calculates various predictions for the active flight plan and updates them continually
during flight as functions of:
‐ Revisions to the lateral and vertical flight plans
‐ Cost index
‐ Current winds and temperature
‐ Present position versus lateral and vertical flight plans
‐ Current guidance modes
‐ Cabin rate of descent
‐ ZFW/ZFWCG or GW/CG on the FUEL PRED page
‐ The engine anti-ice status during descent
‐ QNH on the PERF APPR page
‐ Speed control (managed/selected).
The MCDU and the ND show these predictions, each of which is based on specific assumptions.
Note: During computation, prediction fields on the MCDU pages display dashes.
PREDICTIONS DISPLAYED ON THE NAVIGATION DISPLAY
Applicable to:
These predictions consist of symbols positioned along the lateral flight plan (NAV mode engaged)
or the track line (NAV mode not engaged). These symbols (named as pseudo waypoints) and their
meanings are:
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 3/24
FCOM 19 AUG 10
Pseudo waypoint Definition
Level symbol at the position (top of climb or level-off) where the aircraft will reach:
The FCU selected ‐ altitude (blue) or
‐ The constrained altitude, if it is more restrictive than the FCU altitude and if appropriate
modes are engaged (magenta).
Top of descent or continue descent symbol:
‐ Top of descent (always white)
‐ Continue descent symbol (white if DES is not armed, blue if it is).
Start of CLIMB symbol:
‐ White if CLB is not armed
‐ Blue if CLB is armed.
Intercept point symbol:
The point where the aircraft is predicted to intercept the descent path, if there is any vertical
deviation when the aircraft is in DES mode (white if DES is not engaged, blue if it is).
• Speed change symbol:
The point at which the aircraft will initiate an automatic ACCEL or DECEL from current speed to a
new computed speed if it encounters a SPD LIM, SPD CSTR, or HOLDING SPD (magenta).
Decelerate point symbol, magenta:
Indicates the point at which the aircraft will start an automatic deceleration toward VAPP (and
thus switch to the approach phase).
Although the symbol is always displayed, automatic deceleration only occurs if in managed
speed and NAV or approach mode is engaged.
ALT CSTR symbol set around the constrained waypoint:
‐ Magenta, when the ALT CSTR is predicted to be met
‐ Amber, when the ALT CSTR is predicted to be missed
‐ White, when the ALT CSTR is not taken into account by the FMGS, and the NAV mode is
engaged.
Energy circle symbol (green arc) centered on the aircraft position and oriented to the current
track line. Represents the Required Distance to Land.
Only displayed if the lateral guidance mode is heading or track, and the current FMS flight phase
　
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