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PERFORMANCE - PREDICTIONS
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FCOM 19 AUG 10
The predicted time of arrival at the TO WPT is located in the upper right-hand corner of the ND. It
assumes direct distance from the aircraft position to the TO WPT and assumes current ground speed
will be constant.
As a general rule, the ND indicates what the aircraft will fly, with the current active FG modes.
For example:
The continuous green line on the ND represents the track ‐ the aircraft is currently flying:
• If HDG/TRK is engaged, the track line is green and the flight plan is dashed
• If NAV mode is engaged, the green line is the flight plan.
‐ If the speed target is manually selected, the speed-change symbol is no longer displayed because
it will not be taken into account.
‐ When the aircraft is not following the vertical flight plan (OP CLB, OP DES, V/S) but the NAV
mode is engaged, the system disregards any altitude constraints and puts white circles around the
waypoints that have these constraints and positions level symbols accordingly.
‐ Pseudo waypoints are adjusted each time predictions are updated.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
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FCOM 19 AUG 10
PREDICTIONS DISPLAYED ON THE NAVIGATION DISPLAY
Applicable to:
,
,
MSN,,
4538,,
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:
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:
Indicates the point at which the aircraft is predicted to decelerate for approach ‐ (and thus switch
to the approach phase)
‐ Magenta, if in managed speed and NAV or approach mode is engaged
‐ White, if in selected speed or HDG/TRK mode
‐ Automatic deceleration only occurs when displayed in magenta.
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.
To be continued on next page
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 8/24
FCOM 19 AUG 10
Continued from previous page
Pseudo waypoint Definition
(10 45)
(ETP)
Time marker and equitime point symbols appear in green to indicate where the aircraft reaches
the time marker or equitime point.
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 in descent and approach phases when a selected lateral mode is engaged (HDG
or TRK).
Crosstrack error
XX.XR or XX.XL
(X is a number)
The crosstrack error displays the lateral deviation between the aircraft position and the track of
the F-PLN active leg.
The value is limited to 99.9 nm left or right.
The predicted time of arrival at the TO WPT is located in the upper right-hand corner of the ND. It
assumes direct distance from the aircraft position to the TO WPT and assumes current ground speed
will be constant.
As a general rule, the ND indicates what the aircraft will fly, with the current active FG modes.
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 9/24
　
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