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DISARMING CONDITIONS
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 the go-around phase.
- Loss of vertical flight path validity.
- Setting the FCU-selected altitude at an altitude constraint while ALT CSTR* (ALT*
   magenta <~) was engaged. (ALT* green engages and DES mode disarms).
ENGAGEMENT CONDITIONS
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 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.
   ~ The aircraft sequences a waypoint with an altitude constraint, and DES mode is armed
    The DES mode engages automatically.
or
The pilot presses the ALT selector knob, while ALT CSTR* or ALT CSTR (ALT* or ALT
magenta <~)is not engaged.
or
The pilot presses the ALT selector knob, while ALT* or ALT is engaged, but the current
altitude is not an effective altitude constraint of the flight plan.
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
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.
- The pilot selects an altitude on the FCU that is higher than the aircraft altitude, 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.
CCM ALL
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┃I  ~-~ .4318                    ┃  AUTO FLIGHT   ┃1.22.30     P 27      ┃
┃ aw aw ,, ~e~ .4319             ┃                ┃                      ┃
┃                                ┃                ┣━━━━━┳━━━━━┫
┃ Lli,~ A320                     ┃                ┃SEQ 100 I ┃I REV 25  ┃
┃      A~7-~'M" .4321            ┃FLIGHT GUIDANCE ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                ┃          ┃          ┃
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GUIDANCE
Descent initiation
In order to initiate the descent, the pilot :
- Turns the ALT selector knob to set the cleared altitude.
- Pushes in the ALT selector knob.
   ~ If the aircraft has not reached top of descent (T/D), it will descend immediately at a
    constant V/S, converging on the descent profile.
   ~ If the aircraft is at or beyond T/D, it descends immediately at idle thrust.
During the descent :
The pilot sees a vertical deviation
the PROG page, so as to monitor
profile.
The aircraft may deviate from the
- unexpected wind conditions is
- anti-icing is turned on or,
- lateral flight plan is modified.
symbol (VDEV) along the ALT scale on the PFD and on
the aircraft vertical position on the calculated descent
DES path while DES mode is engaged if
encountered or,
                 ECON    DES    AF5612
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(40)