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‐ Manual engagement of another vertical mode
‐ Selection of an altitude higher than the present altitude. V/S (FPA) engages on the current V/S
(FPA). If within 5 s after reversion to V/S, the flight crew does not confirm the altitude target
change by another expected action, a triple click aural warning sounds, and the V/S (FPA) is
boxed white and flashes for 10 s.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - OPEN DESCENT MODE
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FCOM 19 AUG 10
GUIDANCE
Applicable to: ALL
When OPEN DES is engaged, pitch control maintains the target speed/Mach number, and autothrust
maintains idle thrust (or the flight crew maintains it manually). The speed target may be either
selected or managed.
The OPEN DES mode disregards all altitude constraints.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE ACQUIRE MODE
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FCOM 19 AUG 10
GENERAL
Applicable to: ALL
ALT* mode guides the aircraft to acquire the FCU selected altitude.
ALT CST* guides the aircraft to acquire an altitude constraint provided by Flight Management.
ALT CRZ* guides the aircraft to acquire the cruise altitude, as selected on the FCU and the MCDU
PROG page.
Once the aircraft has reached the altitude, the altitude mode (ALT or ALT CST or ALT CRZ)
engages.
ARMING CONDITIONS
Applicable to: ALL
ALT*, or ALT CST*, or ALT CRZ* can be internally armed, but it is not displayed for the flight crew.
ENGAGEMENT CONDITIONS
Applicable to: ALL
The mode engages when the aircraft reaches the altitude capture zone, defined by the aircraft
vertical speed (among other parameters).
Note: ALT* and ALT CST* cannot be engaged below 400 ft, if either the takeoff or the go-around
mode is engaged.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE ACQUIRE MODE
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FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
Applicable to:
The mode is disengaged by one of the following conditions:
Engagement of V/S mode on current vertical speed, by turning ‐ the FCU ALT knob by more than
250 ft.
‐ Engagement of another vertical mode, provided the FCU altitude has been changed by more than
250 ft.
DISENGAGEMENT CONDITIONS
Applicable to: ,
The mode is disengaged by one of the following conditions:
‐ Engagement of V/S mode on current vertical speed, by turning the FCU ALT knob by more than
250 ft.
If within 5 s after reversion to V/S (FPA) the flight crew does not confirm the altitude target change
by:
• Pulling the ALT knob, or
• Setting a new V/S (FPA) target, or
• Pushing the ALT pb on the FCU,
then, a triple click aural warning sounds, and the V/S (FPA) is boxed white for additional 10 s.
‐ Engagement of another vertical mode, provided the FCU altitude has been changed by more than
250 ft.
GUIDANCE
Applicable to: ALL
ALT* mode has an internal V/S guidance that is a direct function of the difference between present
altitude and the altitude target.
ALT* and ALT CST* modes have internal protections that decreases the vertical speed when VLS or
VMAX is reached. (VLS or VMAX becomes the priority target).
The system switches automatically to ALT (altitude hold) when the altitude deviation becomes less
than 40 ft.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE ACQUIRE MODE
A330/A340 FLEET DSC-22_30-70-65 P 3/4
FCOM 19 AUG 10
Note: ‐ If the baro setting is changed during ALT* mode, this may lead to an FCU target
overshoot due to the change of the current value of the altitude. However ALT* mode will
allow the FCU altitude to be regained.
‐ For aircraft equipped with QFE option, a switching from STD to QFE (or vice versa) in
ALT CST* mode, will change the target value and a reversion to V/S may occur if the
target value is modified of 250 ft or more.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE ACQUIRE MODE
Intentionally left blank
A330/A340 FLEET DSC-22_30-70-65 P 4/4
FCOM 19 AUG 10
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 1/2
FCOM 19 AUG 10
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 2(47)
