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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 i‐s 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.‐
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 4/18
FCOM 19 AUG 10
PREDICTIONS DISPLAYED ON THE MCDU
Applicable to: ALL
The predictions displayed on the MCDU assume that AP (or FD order) is controlling the aircraft and
flying it along the preplanned lateral and vertical flight plan.
Therefore:
If the aircraft is guided along the flight plan (managed guidance), the MCDU predictions‐
correspond exactly to what the aircraft is doing.
If the aircraft is not guided along the flight plan (selected guidance), the MCDU predictions assume‐
that it will return immediately to the flight plan, intercepting at a predetermined angle, and will then
proceed under managed guidance.
If the aircraft does not fly the managed speed profile (ECON, SPD CSTR...), the MCDU‐
predictions assume that it will remain at the present selected speed/Mach until it reaches the next
SPD CSTR or SPD LIM or enters the next flight phase.
The TO waypoint information in the right upper corner are updated as if the aircraft would still fly‐
toward it.
TYPE OF PREDICTIONS
Applicable to: ALL
MCDU PAGE:
Pseudo waypoints: T/C, T/D, S/C, S/D, I/P, SPD LIM, DECEL F-PLN A and B
TIME / SPD / ALT at each WPT and pseudo-WPT F-PLN A
ETA / DIST TO DEST along F-PLN / EFOB at destination F-PLN A and B
EFOB / T-WIND at each WPT and pseudo-WPT F-PLN B
Constraint symbol * at each constrained WPT (TIME / SPD / ALT) F-PLN A and B
Altitude error in case of missed ALT constraint VERT REV
EFOB / EXTRA FUEL at each WPT VERT REV
TIME / EFOB at destination FUEL PRED / PERF CLB / CRZ / DES
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 5/18
FCOM 19 AUG 10
Continued from previous page
MCDU PAGE:
TIME / DIST to a selected altitude PERF CLB or DES
Fuel prediction prior engine start INIT B
REC MAX FL PROG
TIME / EFOB at Alternate FUEL PRED
XTRA FUEL for various Alternates ALTN
VDEV vertical deviation from vertical flight path PROG
Required Distance to Land PROG
Direct Distance to Destination PROG
EXAMPLES OF MCDU PREDICTIONS
Applicable to: ALL
The following MCDU pages display some of the prediction types.
Pseudo‐-waypoints:
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 6/18
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
中国航空网 www.aero.cn
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 1(93)
