AIRBUS A320 Flight Crew Operating Manual2(42)

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┃      A~7-~'M" A321             ┃FLIGHT GUIDANCE ┃SEQ 001 ┃REV 25  ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                ┃        ┃        ┃
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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).
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.
CCM ALL
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┃                                ┃                            ┃1.22.30     P 30      ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  ~-~ A318                     ┃l          AFLIGHTIGUIDANCE ┃SEQ 001 1 ┃I REV 25  ┃
┃ aw aw ,, ~e~ A319              ┃                            ┃          ┃          ┃
┃ Lli,~ A320                     ┃                            ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                            ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                            ┃          ┃          ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━━━━━━━┻━━━━━┻━━━━━┛
Aircraft below DES profile
If the aircraft is below the DES profile, its speed will be maintained at target speed until
it reaches the descent profile.
The intercept point on the navigation display is based on the following assumptions :
~ if the aircraft is flying an idle segment :
 The FMGS maintains V/S = - 1000 ft/min and target speed, until it reaches the
 constraint altitude or intercepts the profile.
~ if the aircraft is flying a geometric segment :
 The FMGS maintains a constant flight path angle (half of the theoretical FPA of the
 profile) until it intercepts either the altitude constraint or the profile.
(~A/C ABOVE THE PROFILE   -
　
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