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GENERAL
Applicable to: ALL
The ALT mode maintains a target altitude. This target altitude is either the FCU selected altitude
(ALT, ALT CRZ) or an altitude constraint delivered by the Flight Management (ALT CST).
ARMING CONDITIONS
Applicable to: ALL
The ALT mode arms automatically whenever the aircraft climbs or descends toward the target
altitude.
Note: The ALT mode arms only if the difference between the current altitude and the FCU
selected altitude is at least 250 ft.
When ALT is armed, the FMA displays the ALT message on its second line:
Blue when the ‐ target altitude is the FCU selected altitude
‐ Magenta if the target altitude is an altitude constraint.
ENGAGEMENT CONDITIONS
Applicable to: ALL
ALT mode engages when:
‐ The difference between present altitude and target altitude becomes less than 40 ft with ALT*
engaged, or
‐ The ALT pb of the FCU is pressed.
DISENGAGEMENT CONDITIONS
Applicable to: ALL
The ALT mode disengages when any other vertical mode engages.
The ALT pb cannot be used to disengage ALT mode.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE HOLD MODE
A330/A340 FLEET DSC-22_30-70-70 P 2/2
FCOM 19 AUG 10
GUIDANCE
Applicable to: ALL
‐ The altitude that ALT mode holds is the altitude it memorized when engaged. It is not affected by a
change of barometric reference or by a change in the barometric correction.
When ALT is engaged, the FMA displays ALT in green if it ‐ is the FCU altitude or ALT CST in green
if it is an altitude constraint
‐ If the AP is engaged while FD is already engaged in ALT mode at the FCU selected altitude, the
autopilot:
• Acquires and holds the FCU altitude if present altitude is within 250 ft of it, or
• Commands a level-off if present altitude is more than 250 ft from the FCU altitude.
A/THR SOFT MODE
Applicable to: ALL
The autothrust soft mode engages when the aircraft is in ALT CRZ mode with the autopilot engaged,
autothrust engaged in MACH mode, and is within a ± 3 kt range of the target speed. This mode
decreases the autothrust gains, to reduce thrust variation in cruise with turbulence.
The autothrust soft mode disengages, when the speed deviation from the target becomes too large
or the target is modified. Autothrust transition from soft to basic mode may lead to transient thrust
variation. This mode is inhibited with speedbrakes extended, with engine-out, when mach target is
below 0.65, with slats extended, or with landing gear down.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - VERTICAL
SPEED MODE - FLIGHT PATH ANGLE MODE
A330/A340 FLEET DSC-22_30-70-80 P 1/2
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The V/S - FPA mode is a selected mode. It obtains and holds the vertical speed or the flight path
angle, displayed in the V/S - FPA window of the FCU.
The HDG V/S - TRK FPA pb on the FCU enables the flight crew to select either type of reference for
use in guidance and for display on the PFD.
ENGAGEMENT CONDITIONS
Applicable to: ALL
The flight crew can engage the mode manually as follows:
‐ Pull out the V/S or FPA knob (at least 5 s after lift-off) or push it in for an immediate level-off (V/S =
0)
‐ Engage the AP and/or FD if AP and FD were not engaged (basic mode of AP/FD engagement)
‐ Select a different altitude (more than 250 ft from present altitude) when in ALT* mode
‐ Select a higher altitude than current altitude when in DES, OP DES mode
‐ Select a lower altitude than current altitude when in CLB, OP CLB mode.
The mode engages automatically:
‐ 5 s after lift-off, if no other vertical mode is engaged
‐ At loss of G/S* or G/S mode
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - VERTICAL
SPEED MODE - FLIGHT PATH ANGLE MODE
A330/A340 FLEET DSC-22_30-70-80 P 2/2
FCOM 19 AUG 10
‐ At loss of FINAL mode
‐ At loss of LOC* or LOC mode
‐ At loss of NAV mode when DES mode is engaged
‐ At loss of vertical flight path in DES mode.
When V/S - FPA mode is engaged, V/S or FPA is displayed in green on the FMA with the current
target.
DISENGAGEMENT CONDITIONS
Applicable to: ALL
The flight crew can disengage the V/S mode manually by:
‐ Pulling or pushing the Altitude knob, or
‐ Initiating a go-around.
It disengages automatically:
‐ When the aircraft reaches the FCU altitude, or
‐ Upon G/S* engagement.
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(48)
