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┃ Lli,~ A320                     ┃                ┃SEQ 100 I ┃I REV 34  ┃
┃      A~7-~'M" A321             ┃FLIGHT GUIDANCE ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                ┃          ┃          ┃
┗━━━━━━━━━━━━━━━━┻━━━━━━━━┻━━━━━┻━━━━━┛
RETARD MODE
The RETARD mode is only available during automatic landing (AP engaged in LAND mode).
At approximately 40 feet RA, the RETARD mode engages and remains engaged after
touchdown. The A/-rHR commands IDLE thrust during the flare, and the FMA and engine
warning display "IDLE". If the autopilot is disengaged during the flare before touchdown,
the SPEED mode replaces the RETARD mode, and the pilot has to manually reduce thrust.
Note: In an automatic landing, the system generates a "RETARD" callout at 10 feet
       radioaltitude (RA), which prompts the pilot to move the thrust levers to IDLE in order
       to confirm thrust reduction. In manual landing conditions, the system generates this
       callout at 20 feet RA, as a reminder.
ALPHA FLOOR
ALPHA FLOOR is a protection that commands TOGA thrust, regardless of the thrust levers'
positions. This protection is available from lift-off to 100 feet RA on approach.
ALPHA FLOOR calls up the following indications :
- "A FLOOR" in green, surrounded by a flashing amber box on the FMA, and in amber on
   the engine warning display, (as long as m-floor conditions are met).
- "TOGA LK" in green, surrounded by a flashing amber box on the FMA, when the aircraft
   leaves the m-floor conditions. TOGA thrust is frozen.
To cancel ALPHA FLOOR or TOGA LK thrust, the pilot must disconnect the autothrust.
SPEED/MACH mode
In SPEED/MACH mode, the A/-I-HR adjusts the thrust in order to acquire and hold a speed
or Mach target.
The speed or Mach target may be :
- Selected on the FCU by the pilot.
- Managed by the FMGC.
When in SPD/MACH mode, the A/-I-HR does not allow speed excursions beyond the
following limits, regardless of the target speed or Mach number :
- For a selected speed target, the limits are VLS and VMAX (VMO-MMO, VFE-VLE,
   whichever applies).
- For a managed speed target, the limits are maneuvering speed (Green Dot, S, F,
   whichever applies) and maximum speed (340/.80-VFE-VLE, whichever applies).
The changeover from SPEED to MACH mode is either automatic, performed by the FMGC,
or manual, with the pilot pushing the SPD/MACH changeover pushbutton.
The FMA displays "SPEED" or "MACH".
Approach autothrust :
Below 3200 feet radioaltitude, with at least CONF 1, the A/THR logic is modified to be more
responsive to speed variation. This is referred to as approach autothrust.
CCM ALL
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┃                                ┃                            ┃1.22.30     P 66      ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  -~ A318                      ┃l          AFLIGHTIGUIDANCE ┃SEQ 001 1 ┃I REV 25  ┃
┃  .,,,.8, ,, ~e~ A319           ┃                            ┃          ┃          ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(76)