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a different speed or Mach can be entered to amend the speed profile.
It is obtained by entering a Mach number and/or a speed in the MANAGED 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 8/22
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 SELECTED Mach
‐ ECON SPD, or SELECTED Speed
‐ SPD CSTR (if any)
‐ SPD LIMIT
‐ Green Dot/S/F/VAPP
‐ VAPP TARGET.
DESCENT SPEED PROFILE
Applicable to:
,
,
MSN,,,,
The descent speed profile is usually the ECON SPD profile, amended by any speed constraints and
speed limit contained in the flight plan.
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.
It is obtained by entering a Mach number and/or a speed in the MANAGED 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 9/22
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.
GUIDANCE IN DES MODE
Applicable to: ALL
DESCENT INITIATION
The aircraft will not start its descent automatically when reaching the top of descent (T/D). In order
to initiate the descent, the flight crew sets the clearance altitude by turning the ALT knob then
pushes the ALT knob.
The aircraft will descend immediately:
‐ If the top of descent is not reached, the aircraft descends at a constant V/S converging on the
descent path
‐ If the aircraft is at or beyond the T/D, it descends at idle thrust.
Applicable to:
DURING THE DESCENT
The flight crew will see a vertical deviation symbol (VDEV) along the ALT scale on the PFD and a
VDEV value on the PROG page, so that the aircraft’s vertical position can be monitored versus the
calculated descent profile.
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 10/22
FCOM 19 AUG 10
The aircraft may deviate from the DES profile while DES mode is engaged if:
‐ Unexpected wind conditions are encountered
‐ Anti-icing is turned on
‐ The lateral flight plan is changed.
When the speed is managed, a target speed range displayed on the PFD defines acceptable
speed variations around the nominal descent speed target.
Applicable to:
,
,
MSN,,,,
DURING THE DESCENT
The flight crew will see a vertical deviation symbol (VDEV) along the ALT scale on the PFD and a
VDEV value on the PROG page, so that the aircraft’s vertical position can be monitored versus the
calculated descent profile.
The aircraft may deviate from the DES profile while DES mode is engaged if:
Unexpected ‐ wind conditions are encountered
‐ Anti-icing is turned on
‐ The lateral flight plan is changed.
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 11/22
FCOM 19 AUG 10
When the speed is managed, a target speed range displayed on the PFD defines acceptable
speed variations around the nominal descent speed target.
Applicable to: ALL
FMA DISPLAY
When DES mode is engaged, the system arms ALT and displays the applicable target altitude on
the PFD altitude scale.
‐ If the next predicted level-off is an altitude constraint, ALT is magenta on the FMA second line
and the PFD displays the altitude constraint magenta above the altitude scale.
When the aircraft flies at the altitude constraint (ALT CSTR), the system arms DES blue.
When the aircraft meets the constraint, DES engages again automatically.
‐ If the next predicted level-off is the FCU altitude, ALT is blue on the FMA and the PFD displays
　
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