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prompts the flight crew to move the thrust levers to IDLE in order to confirm thrust
reduction. In manual landing conditions, the system generates this callout at 20 ft 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 ft 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 α-floor conditions are met)
“TOGA LK” in green, surrounded by a flashing amber box on the ‐ FMA, when the aircraft leaves
the α-floor conditions. TOGA thrust is frozen.
To cancel ALPHA FLOOR or TOGA LK thrust, the flight crew must disconnect the autothrust.
SPEED/MACH MODE
In SPEED/MACH mode, the A/THR 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 flight crew
‐ Managed by the FMGC.
When in SPEED/MACH mode, the A/THR 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 (340/0.80-VFE-VLE, whichever applies).
The changeover from SPEED to MACH mode is either automatic, performed by the FMGC, or
manual, with the flight crew pushing the SPD/MACH pb.
The FMA displays “SPEED” or “MACH”.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A318/A319/A320/A321 FLEET DSC-22_30-90 P 10/16
FCOM 19 AUG 10
APPROACH AUTOTHRUST:
Below 3 200 ft RA, 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.
SPEED MODE IN APPROACH PHASE
Applicable to: ALL
GENERAL
When the aircraft flies an approach in managed speed, the speed target displayed on the PFD in
magenta is variable during the approach.
This managed speed target is computed in the FMGS using the “ground speed mini function”.
Applicable to:
GROUND SPEED MINI FUNCTION PRINCIPLE
The purpose of the "ground speed mini function" is to take advantage of the aircraft inertia when
the wind conditions vary during the approach. It does so by providing the flight crew with an
adequate indicated speed target. When the aircraft flies this indicated speed target, the energy of
the aircraft is maintained above a minimum level ensuring standard aerodynamic margins versus
stall.
If the A/THR is active in SPEED mode, it will automatically follow the IAS target, ensuring an
efficient thrust management during the approach.
The minimum energy level is the energy level the aircraft will have at touch down if it lands at
VAPP speed with the tower reported wind as inserted in the PERF APPR page.
The minimum energy level is represented by the Ground Speed the aircraft will have at touch
down. This Ground Speed is called “GROUND SPD MINI”.
During the approach, the FMGS continuously computes the speed target using the wind
experienced by the aircraft in order to keep the ground speed at or above the “Ground Speed
Mini”.
The lowest speed target is limited to VAPP.
The speed target is displayed on the PFD speed scale in magenta when approach phase and
managed speed are active. It is independent of the AP/FD and/or A/THR engagements.
Wind is a key factor in the "ground speed mini function".
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A318/A319/A320/A321 FLEET DSC-22_30-90 P 11/16
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
GROUND SPEED MINI FUNCTION PRINCIPLE
The purpose of the "ground speed mini function" is to take advantage of the aircraft inertia when
the wind conditions vary during the approach. It does so by providing the flight crew with an
adequate indicated speed target. When the aircraft flies this indicated speed target, the energy of
the aircraft is maintained above a minimum level ensuring standard aerodynamic margins versus
stall.
If the A/THR is active in SPEED mode, it will automatically follow the IAS target, ensuring an
efficient thrust management during the approach.
The minimum energy level is the energy level the aircraft will have at touch down if it lands at
　
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