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DESCENT MODE (DES)
DES mode provides managed vertical guidance along a computed descent profile. The
profile is computed from "Top of Descent" at the cruise flight level down to the "Decer'
point, where guidance begins the deceleration to VAPP, to be reached at 1000 feet above
touchdown on the final descent path.
The descent profile takes into account wind data and data from the lateral and vertical flight
plans, and it is based upon the managed descent speed profile. It does not take holding
patterns into consideration.
The descent profile has several segments :
- A repressurization segment. When necessary, this produces a repressurization rate for
   the cabin during descent. It is a function of the destination airport altitude and the
   selected cabin rate (defaulted to - 350 feet/min but this can be modified).
- Idle path segment. The AP/FD controls the speed and autothrust stays at idle thrust.
   Guidance computes this profile from top of descent or the end of the repressurization
   segment to the first vertical constraint that cannot be flown at idle thrust.
- Geometric path segments. The AP/FD controls the vertical path, and autothrust controls
   the speed. These segments take the aircraft from the first constraint to the deceleration
   point.
T/D
IDLE PATH
PHASE~~            DESCENT PHASE        I APPROACH PHASE
           Yl~                                             I
The descent mode is a managed mode that may be engaged during cruise. It can be armed
or engaged in descent and approach phases (unless the FCU selected altitude is higher than
the present aircraft altitude).
ARMING CONDITIONS
R
R
R
R
R
R
The DES mode is armed when an altitude constraint 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.
CCM ALL
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┃                                ┃                            ┃1.22.30     P 26      ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  ~-~ A318                     ┃l          AFLIGHTIGUIDANCE ┃SEQ 001 1 ┃I REV 30  ┃
┃ aw aw ,, ~e~ A319              ┃                            ┃          ┃          ┃
┃ Lli,~ A320                     ┃                            ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                            ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                            ┃          ┃          ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(39)