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GUIDANCE
Applicable to: ALL
The FMGEC pitch mode guides the aircraft to the target V/S or FPA. The corresponding A/THR
mode is SPEED or MACH. The FMA displays V/S (FPA).
The V/S (FPA) guidance has priority over the speed guidance. If the selected target V/S or FPA is
too high (relative to the current thrust condition and speed), the FMGEC will steer the aircraft to the
target V/S or FPA, but the aircraft will also accelerate or decelerate.
When the speed reaches the authorized limit, the V/S or FPA decreases automatically to maintain
the minimum (or maximum) speed limit. (Refer to DSC-22_30-75 General).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 1/16
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
There are several types of mode reversions. Each one observes a specific logic that can be
described as follows.
INTERACTION BETWEEN LATERAL MODES,
VERTICAL MODES, AND MANAGED SPEED PROFILE
Applicable to:
�� When NAV mode is engaged:
The FMGES guides the aircraft along the flight plan and considers the constraints attached to the
F-PLN waypoints. As a result, managed CLB and DES modes are available.
�� When NAV mode is not engaged:
The FMGES considers that the flight plan is not followed and ignores all speed and altitude
constraints linked to the F-PLN waypoints. As a consequence the managed vertical CLB and
DES modes are not available, and the managed SPD profile disregards the speed constraints.
As a consequence, when NAV mode disengages (manual or automatic):
CLB mode, ‐ when engaged, reverts to OPEN CLB
‐ DES mode, when engaged, reverts to V/S mode on current value
‐ Speed and altitude constraints are disregarded (but speed limit is retained).
INTERACTION BETWEEN LATERAL MODES,
VERTICAL MODES, AND MANAGED SPEED PROFILE
Applicable to: ,
�� When NAV mode is engaged:
The FMGES guides the aircraft along the flight plan and considers the constraints attached to the
F-PLN waypoints. As a result, managed CLB and DES modes are available.
�� When NAV mode is not engaged:
The FMGES considers that the flight plan is not followed and ignores all speed and altitude
constraints linked to the F-PLN waypoints. As a consequence the managed vertical CLB and
DES modes are not available, and the managed SPD profile disregards the speed constraints.
As a consequence, when NAV mode disengages (manual or automatic):
‐ CLB mode, when engaged, reverts to OPEN CLB
‐ DES mode, when engaged, reverts to V/S mode on current value
‐ Speed and altitude constraints are disregarded (but speed limit is retained).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 2/16
FCOM 19 AUG 10
When OPEN CLB or V/S engages following the NAV mode disengagement, the lateral mode is
boxed white for 10 s. The vertical mode is boxed white.
If disengagement of the NAV mode is not confirmed by one of the following actions within 5 s:
‐ New FCU altitude target
‐ Level-off
‐ V/S selection
then, the triple click aural warning sounds. The white box flashes around the vertical mode for
additional 10 s.
MODE REVERSION DUE TO FCU ALTITUDE CHANGE
Applicable to:
When an OPEN mode is engaged, the aircraft climbs or descends towards the altitude set on the
FCU. If the flight crew sets the FCU altitude to a target not compatible with the active open mode, a
mode reversion occurs and V/S (or FPA) engages on current V/S (or FPA).
This reversion applies to CLB, OP CLB, DES, OP DES.
Example: Reversion from OP CLB to V/S:
With ALT* engaged, if the target altitude is changed by any value greater than 250 ft, V/S (or FPA)
engages on currents V/S (or FPA). Refer to DSC-22_30-75 Mode Reversions (Summary).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 3/16
FCOM 19 AUG 10
MODE REVERSION DUE TO FCU ALTITUDE CHANGE
Applicable to: ,
When an OPEN mode is engaged, the aircraft climbs or descends towards the altitude set on the
FCU. If the flight crew sets the FCU altitude to a target not compatible with the active open mode, a
mode reversion occurs and V/S (or FPA) engages on current V/S (or FPA).
This reversion applies to CLB, OP CLB, DES, OP DES.
Example: Reversion from OP CLB to V/S:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 4/16
　
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