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IDLE THRUST
TARGET SPD + MARGIN
1/2 SPEEDBRAKES IF REQUESTED
~and<~A/C BELOW THE PROFILE -
SPEED MODE
TARGET SPEED
Leveling off at a constraint
~ If the aircraft levels off at an ALT CSTR, the DES mode arms and remains armed until
 the aircraft passes the constraint, then reengages (if the FCU altitude is set below the
 altitude of the constraint).
~ if the FCU selected altitude is that of a constraint, the pilot may continue the descent
 below that altitude by turning the ALT SEL knob and pushing it in. This arms the DES
 mode, which reengages when the aircraft passes the constraint waypoint.
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━┳━━━━━━━━━━━┓
┃I  -~ A318                      ┃  AUTO FLIGHT   ┃1.22.30     P 31      ┃
┃  .*,,.8, ,, ~e~ A319           ┃                ┃                      ┃
┃                                ┃                ┣━━━━━┳━━━━━┫
┃ Lli,~ A320                     ┃                ┃SEQ 100 I ┃I REV 25  ┃
┃      A~7-~'M" A321             ┃FLIGHT GUIDANCE ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                ┃          ┃          ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━┻━━━━━┻━━━━━┛
Guidance in a hold
Just before the aircraft enters a holding pattern, the speed target becomes the holding
speed. In the holding pattern, the DES mode commands V/S = - 1000 ft/min while
autothrust maintains the holding speed. The aircraft will level off at the next altitude
constraint if it is reached during the hold.
The vertical deviation (VDEV) is based on the altitude at which the aircraft is supposed
to cross the exit fix in order to be properly positioned on the descent profile.
Too steep path :
A segment between two constraints is called "too steep path" when Flight Management
predicts that it is impossible to fly it at the preplanned speed with 1/2 speedbrakes
extended. The MCDU displays TOO STEEP PATH and FM does not furnish predictions for
the waypoints included in the TOO STEEP PATH segment. When the aircraft reaches the
beginning of the too steep path segment, the FM recomputes the VDEV using an idle
segment from the end of the too steep path segment.
FMA display
When DES mode is engaged, the system arms ALT and displays the applicable target
altitude on the PFD altitude scale.
If the next predicted level-off is an altitude constraint, ALT is magenta on the FMA
second line and the PFD displays the altitude constraint magenta above the altitude
scale.
When ALT CSTR (green) is engaged (aircraft flying at ALT CSTR), the system arms DES
blue. When the aircraft meets the constraint, DES engages again automatically.
If the next predicted level-off is the FCU altitude, ALT is blue on the FMA and the PFD
displays the FCU selected altitude in blue.
Typical FRA in DES
CCM ALL
┏━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃                                ┃                            ┃1.22.30     P 32      ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(43)