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engages and DES mode disarms).
ENGAGEMENT CONDITIONS
Applicable to: ALL
The DES mode can be engaged, when the following conditions are met:
The FCU selected altitude ‐ is lower than present altitude
‐ NAV, LOC*, or LOC mode is engaged
‐ Takeoff, climb, or go-around phase is not active
‐ Vertical flight path is valid
‐ TO, G/S, LAND, FINAL or GA mode is not engaged, and:
• The aircraft sequences a waypoint with an ALT CSTR, and DES mode is armed. The DES
mode engages automatically, or
• The flight crew presses the ALT knob, while ALT CST* or ALT CST is not engaged, or
• The flight crew presses the ALT knob, while ALT* or ALT is engaged, but the current altitude is
not an effective altitude constraint of the F-PLN.
Note: When DES mode is engaged:
‐ The V/S - FPA window of the FCU shows dashes
‐ The managed LVL/CH dot on the FCU lights up.
DISENGAGEMENT CONDITIONS
Applicable to:
The DES mode is disengaged, if one of the following conditions is met:
‐ The NAV mode is lost or disengaged and the V/S or FPA mode engages
‐ Another vertical mode engages
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-50 P 5/22
FCOM 19 AUG 10
‐ The flight crew selects an altitude on the FCU that is higher than the aircraft present altitude and
the V/S (FPA) engages on current V/S (FPA)
‐ NAV mode is lost due to a discontinuity in the descent profile. AP/FD reverts to basic mode.
Refer to DSC-22_30-75 General.
DISENGAGEMENT CONDITIONS
Applicable to:
,
,
MSN,,,,
The DES mode is disengaged, if one of the following conditions is met:
‐ The NAV mode is lost or disengaged and the V/S or FPA mode engages. A triple click aural
warning will sound
‐ Another vertical mode engages
‐ The flight crew selects an altitude on the FCU that is higher than the aircraft present altitude and
the V/S (FPA) engages on current V/S (FPA). Same triple click logic, as for the OP DES case
NAV mode is lost due to a discontinuity in the descent profile. AP/F ‐ D reverts to basic mode, and a
triple click aural warning sounds. The vertical mode is boxed in white for 10 s.
Refer to DSC-22_30-75 General.
REPRESSURIZATION SEGMENT
Applicable to:
The top of descent (T/D) may be updated if the flight crew modifies the cabin rate of descent (default
rate is - 350 ft/min).
If the flight crew enters a lower cabin rate, the system computes a repressurization segment that
takes into account the additional time needed for repressurization.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-50 P 6/22
FCOM 19 AUG 10
REPRESSURIZATION SEGMENT
Applicable to:
,
,
MSN,,
4617,
The top of descent (T/D) may be updated if the flight crew modifies the cabin rate of descent (default
rate is - 350 ft/min).
If the flight crew enters a lower cabin rate, the system computes a repressurization segment that
takes into account the additional time needed for repressurization.
DESCENT SPEED PROFILE
Applicable to:
The descent speed profile is usually the ECON SPD profile, amended by any speed constraints and
speed limit contained in the flight plan.
Before the descent phase is active, if flight crew does not intend to fly the ECON speed/Mach profile,
a different speed or Mach can be entered to amend the speed profile.
This selected speed/Mach is called AUTO SPD. It is obtained by entering a Mach number and/or a
speed in the ECON field of the PERF DES MCDU page (3L key).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A318/A319/A320/A321 FLEET DSC-22_30-70-50 P 7/22
FCOM 19 AUG 10
If the flight crew reverts to the SELECTED speed/MACH mode during descent, the profile is not
modified and the aircraft flies the same profile at the FCU selected speed/MACH value.
Basic managed SPD/MACH profile in DES mode is:
‐ ECON MACH, or AUTO MACH
‐ ECON SPD, or AUTO SPD
‐ SPD CSTR (if any)
‐ SPD LIMIT
‐ Green Dot/S/F/VAPP
‐ VAPP TARGET.
DESCENT SPEED PROFILE
Applicable to:
The descent speed profile is usually the ECON SPD profile, amended by any speed constraints and
speed limit contained in the flight plan.
Before the descent phase is active, if flight crew does not intend to fly the ECON speed/Mach profile,
　
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