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The predictions displayed on the MCDU assume that the FMGES will guide the aircraft along the
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 FMGEC 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: ALL
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‐
The cost index‐
Current winds and temper‐ature
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 2/18
FCOM 19 AUG 10
Note: During computation, prediction fields on the MCDU pages show dashes.
PREDICTIONS DISPLAYED ON THE NAVIGATION DISPLAY
Applicable to: ALL
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 arrow)‐
The constrained altitude, if it is more restrictive than the FCU altitude and if appropriate‐
modes are engaged (magenta arrow).
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 deceler‐ation only occur when displayed in magenta.
ALT CSTR symbol set around the constrained waypoint:
Magenta, when the ALT CSTR is predicted to be satisfied‐
Amber, when the ALT CSTR is predicted to be missed‐
White, when the ALT CSTR is not taken into acc‐ount by the guidance, and the NAV mode is
engaged.
To be continued on next page
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 3/18
FCOM 19 AUG 10
Continued from previous page
Pseudo waypoint Definition
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 is in cruise, descent or approach, and the aircraft is within 180 nm of the destination.
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.
INTCPT Intercept waypoint is displayed on the ND at the point at which the present track intercepts the
F-PLN.
The predicted time of arrival at the TO WPT is located in the upper right-hand corner of the ND. It
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 1(92)
