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AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 7/18
FCOM 19 AUG 10
VERTICAL DEVIATION
Applicable to: ALL
During descent, the system tells you how far you are from the computed descent profile (PFD and
MCDU) and predicts where you may rejoin it.
VDEV on the PFD and PROG page, predictions on the MCDU F-PLN page, symbols on the ND
display, allows you to assess your vertical position versus the computed flight profile.
The energy circle displayed on ND, representing the required distance to land from present position
and current speed down to destination at VAPP, may also be used to tell you if you need to modify
the flight path you intend to fly.
OPERATION RULES CONCERNING PREDICTIONS
Applicable to: ALL
The flight crew must keep the flight plan data properly updated during the flight in order to get
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).
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: ALL
ENGINE-OUT CASE
The FMGES computes an engine-out target speed for each flight phase.
It computes an engine-out maximum altitude (EO MAX ALT) at long-range cruise speed, and
displays it on the PROG page. The new speed target becomes Green Dot in climb phase or EO
CRZ SPD in level flight.
The system computes the flight plan predictions down to the primary destination assuming that the
cruise phase is at the lower of CRZ FL or EO MAX ALT.
For the engine-out obstacle strategy, the system computes a drift down descent at Green Dot and
down to a level off altitude.
Applicable to: ALL
FUEL PLANNING
After the F-PLN, CRZ FL, CI, ZFW, and ZFWCG insertion, the FMGEC may compute on flight
crew request the minimum fuel to meet the requirements of the flight taking into account a
predetermined fuel policy (Navigation Database).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 8/18
FCOM 19 AUG 10
Fuel predictions are automatically performed after the F-PLN, CRZ FL, and ZFW insertion. The
FMGEC has to know the FOB either inserted by the flight crew (BLOCK FUEL) or computed by the
system.
Applicable to: ALL
EQUI-TIME POINT (ETP)
The ETP is a pseudo waypoint along the lateral flight plan at which the time to reach two reference
waypoints is the same, taking distance and winds into account.
Applicable to: ALL
TIME MARKER
This pseudo waypoint may be created for display on MCDU/ND.
Applicable to: ,
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 speed 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 0.2 g buffet margin is also computed. It is not displayed, but the system
uses it to limit CRZ ALT entry.
Applicable to: ,
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 speed and lower than VMO‐/MMO
The aircraft is certified at.‐
The REC MAX altitude is displayed on the PROG page.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT MANAGEMENT
PERFORMANCE - PREDICTIONS
A330/A340 FLEET DSC-22_20-40-30 P 9/18
FCOM 19 AUG 10
Anti-ice is not taken into account for this computation. Refer to QRH graphs if icing conditions are
expected.
A maximum altitude using 0.2 g buffet margin is also computed. It is not displayed, but the system
uses it to limit CRZ ALT entry.
Note: A REC MAX value exceeding FL 411 should be disregarded.
Applicable to: ALL
PREDICTIONS FOR ALTERNATES
Predictions for alternates are displayed on the ALTERNATES page.
They are based on:
　
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