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FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
Applicable to:
,
,
MSN,,,,
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 V/S or FPA knob 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:
,
,
MSN,,,,
The ALT* and ALT CST* mode have internal V/S guidance that is a direct function of the difference
between present altitude and the altitude target.
The system switches automatically to ALT (altitude hold) when the altitude deviation becomes less
than 20 ft.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE ACQUIRE MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-65 P 3/4
FCOM 19 AUG 10
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).
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.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE ACQUIRE MODE
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-22_30-70-65 P 4/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE HOLD MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-70 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The ALT mode maintains a target altitude. This target altitude is either the FCU selected altitude or
an altitude constraint delivered by Flight Management.
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
The ALT mode is engaged automatically when the difference between present altitude and the target
altitude becomes less than 20 ft with ALT* engaged.
Note: The ALT mode is displayed on the FMA when the V/S knob is pushed in or is pulled out
with V/S-FPA target set to zero but V/S mode is still active. In other words, if V/S knob is
dialled up or down, the aircraft will climb or descend without any pulling action.
DISENGAGEMENT CONDITIONS
Applicable to: ALL
The ALT mode disengages when any other vertical mode engages.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - ALTITUDE HOLD MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-70 P 2/4
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 reference in the ALT window or by a change in the barometric correction.
‐ When ALT is engaged, the FMA displays ALT in green (FCU altitude hold) 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.
SOFT ALTITUDE MODE (CRUISE)
Applicable to: ALL
The soft altitude mode engages when the aircraft reaches the FCU altitude set as the cruise flight
level (entered in the F-PLN or on PROG page).
The soft altitude mode corrects minor deviations from the Mach target by allowing a ±50 ft variation
　
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