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the first vertical constraint that cannot be flown at idle thrust
‐ Geometric path segments. The AP/FD controls the vertical path, and the autothrust controls the
speed. These segments take the aircraft from the first constraint to the deceleration point.
The descent mode is a managed mode that may be engaged during cruise. It can be armed or
engaged in descent and approach phases (except if the FCU selected altitude is higher than the
present aircraft altitude).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 3/14
FCOM 19 AUG 10
ARMING CONDITIONS
Applicable to: ALL
The DES mode is armed when an ALT CSTR is captured and all the following conditions are met:
‐ FCU selected altitude is lower than present altitude
‐ NAV, LOC* or LOC mode is engaged
‐ Takeoff or go-around phase is not active
‐ Flight profile is available.
DISARMING CONDITIONS
Applicable to: ALL
The DES mode is disarmed if one of the following conditions is met:
‐ Engagement of another vertical mode
‐ FCU selected altitude is set above the aircraft current altitude
‐ Loss of NAV, LOC*, or LOC mode
‐ Switching to takeoff or go-around or climb phase
‐ Loss of vertical flight path validity.
ENGAGEMENT CONDITIONS
Applicable to: ALL
The DES mode engages 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 4/14
FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
Applicable to:
The DES mode is disengaged, if one of the following conditions is met:
‐ NAV mode is disengaged, and V/S (FPA) engages
‐ 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 the 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: ,
The DES mode is disengaged, if one of the following conditions is met:
‐ NAV mode is disengaged, and V/S (FPA) 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 the current V/S (FPA). A triple click aural warning will sound.
‐ NAV mode is lost due to a discontinuity in the descent profile. AP/FD reverts to basic mode, and a
triple click aural warning sounds.
Refer to DSC-22_30-75 General.
REPRESSURIZATION SEGMENT
Applicable to: ALL
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD VERTICAL MODES - DESCENT MODE
A330/A340 FLEET DSC-22_30-70-50 P 5/14
FCOM 19 AUG 10
DESCENT SPEED PROFILE
Applicable to: ALL
The descent speed profile is usually the ECON speed profile, amended by any speed constraints and
speed limit contained in the flight plan.
Before the descent phase is active, if the 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.
The flight crew may enter a Mach number and/or a speed in the MANAGED field of the PERF DES
MCDU page (3L key).
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.
　
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