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the FCU selected altitude in blue.
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 12/22
FCOM 19 AUG 10
DES MODE PROFILE
Applicable to:
GENERAL
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 13/22
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
GENERAL
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 14/22
FCOM 19 AUG 10
Applicable to:
INTERCEPT POINT
Associated with the VDEV displayed on PFD, the ND shows an intercept point ( ) on the flight
plan. It indicates the position where the system predicts that the aircraft will intercept the 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 15/22
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
INTERCEPT POINT
Associated with the VDEV displayed on PFD, the ND shows an intercept point ( ) on the flight
plan. It indicates the position where the system predicts that the aircraft will intercept the 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 16/22
FCOM 19 AUG 10
Applicable to:
AIRCRAFT ABOVE THE DESCENT PROFILE
If the aircraft is above the descent profile, the speed will increase toward the upper limit of the
managed speed range. If the speed reaches the upper limit, the aircraft will maintain the speed but
will deviate from the profile (autothrust at idle).
The navigation display presents a pseudo waypoint (intercept point) along the flight plan that
assumes the aircraft will return to the profile using:
‐ Idle thrust
‐ 1/2 speedbrake extension
‐ ECON speed plus a margin (until intercepting the profile).
If necessary, the message “AIRBRAKES” (old FMGC standard) or “MORE DRAG” comes up on
the PFD and the MCDU, and remains there as long as more drag (speedbrakes) is still required.
The flight crew should respond to this message by deploying half speedbrakes.
Whenever the intercept point is predicted to be close to a constrained waypoint, the PFD and
MCDU display an “AIRBRAKES” or “MORE DRAG” message depending upon the FMGS
standard.
Note: With DES mode engaged, the speedbrakes extension will not necessarily increase the
descent rate. It increases only if the aircraft is above path.
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 17/22
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,
AIRCRAFT ABOVE THE DESCENT PROFILE
If the aircraft is above the descent profile, the speed will increase toward the upper limit of the
managed speed range. If the speed reaches the upper limit, the aircraft will maintain the speed but
will deviate from the profile (autothrust at idle).
The navigation display presents a pseudo waypoint (intercept point) along the flight plan that
assumes the aircraft will return to the profile using:
‐ Idle thrust
‐ 1/2 speedbrake extension
‐ ECON speed plus a margin (until intercepting the profile).
If necessary, the message “AIRBRAKES” (old FMGC standard) or “MORE DRAG” comes up on
the PFD and the MCDU, and remains there as long as more drag (speedbrakes) is still required.
The flight crew should respond to this message by deploying half speedbrakes.
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 18/22
FCOM 19 AUG 10
Whenever the intercept point is predicted to be close to a constrained waypoint, the PFD and
MCDU display an “AIRBRAKES” or “MORE DRAG” message depending upon the FMGS
standard.
Note: With DES mode engaged, the speedbrakes extension will not necessarily increase the
descent rate. It increases only if the aircraft is above path.
　
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