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Note: When the A/THR is armed for takeoff or go-around, the FMA displays "MAN TOGA"(or
"MAN FLX" or "MAN DTO" �� in white to remind the flight crew that the thrust levers
have been positioned properly.
Applicable to: ,
THRUST MODE
In THRUST mode, autothrust commands a specific thrust level in conjunction with the AP/FD pitch
mode. This thrust level is limited by the thrust lever position.
FMA display Meaning
THR MCT The most advanced thrust lever is in the MCT detent (engine-out)
THR CLB The most advanced thrust lever is in the CL detent
THR LVR Thrust levers are either below CL or MCT detent, or at least one thrust lever is
in CL detent and the others above CL detent
THR IDLE A/THR commands IDLE thrust
THR DCLB1 (2) The most advanced thrust lever is in the CL detent and the flight crew has
selected a derated climb
THR DES A/THR commands a reduced thrust while DES mode is engaged
Note: When the A/THR is armed for takeoff or go-around, the FMA displays "MAN TOGA"(or
"MAN FLX" or "MAN DTO" �� in white to remind the flight crew that the thrust levers
have been positioned properly.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 14/22
FCOM 19 AUG 10
Applicable to: ALL
RETARD MODE
The RETARD mode is available only during automatic landing (AP engaged in LAND mode).
RETARD mode engages at approximately 40 ft RA and remains engaged after touchdown.
The A/THR commands IDLE thrust during the flare, and the FMA and engine warning display
show “IDLE”. If the autopilot is disengaged during the flare before touchdown, the SPEED mode
replaces RETARD mode, and the flight crew has to reduce thrust manually.
Note: In automatic landing, the system generates a "RETARD" callout at 10 ft RA, which
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 as a reminder
at 20 ft RA.
Applicable to:
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 FMGEC.
When in SPEED or 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 (320/0.84-VFE-VLE whichever applies).
The changeover from SPEED to MACH mode is either automatically performed by the FMGEC or
manually by the flight crew (in selected speed target only) by pushing the SPD/MACH pb.
The FMA displays "SPEED" or MACH".
MACH MODE IN CRUISE PHASE (A/THR SOFT MODE)
When the aircraft is in ALT CRZ mode with the autopilot engaged, autothrust engaged in MACH
mode, and is within a ± 3 kt range of the target speed, the autothrust soft mode engages. This
mode reduces the thrust variation in cruise, specifically in light turbulence. The autothrust soft
mode disengages when the speed deviation from the target becomes too large or the target is
modified. Autothrust transition from soft to basic mode may lead to transient thrust variation.
This mode is inhibited with the speedbrakes extended, or with an engine-out, or when Mach
target is below M 0.65.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 15/22
FCOM 19 AUG 10
Applicable to: ,
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 FMGEC.
When in SPEED or 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 (320/0.84-VFE-VLE whichever applies).
In descent, the maximum managed speed targets computed by the FMS are
315/0.83-VFE-VLE, whichever applies.
The changeover from SPEED to MACH mode is either automatically performed by the FMGEC or
　
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