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‐ Maintains a specific thrust in THRUST mode
‐ Controls the aircraft speed or Mach in SPEED/MACH mode
‐ Uses ALPHA FLOOR mode to set maximum thrust when the aircraft angle of attack exceeds a
specific threshold.
The autothrust system can operate independently or with the AP/FD:
‐ When performing alone, A/THR always controls the speed
‐ If the autothrust system is working with the AP/FD, the A/THR mode and AP/FD pitch modes are
linked together. (Refer to DSC-22_30-10 Interaction between AP/FD and A/THR Modes).
When autothrust is active, the FMGES commands the thrust according to the vertical mode logic, but
uses a thrust not greater than the thrust commanded by the position of the thrust lever. For example,
when the thrust levers are set at the CL (climb) detent, A/THR can command thrust between idle and
max climb.
The autothrust system, when armed, automatically activates if the thrust levers are moved into the
active range sector. Outside of this range, thrust levers control thrust directly.
MASTER A/THR
The thrust being controlled by one A/THR only, when one AP is engaged, priority is given to the
associated autothrust.
When both APs are engaged or no AP/FD engaged, A/THR1 has the priority.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 3/22
FCOM 19 AUG 10
THRUST LEVERS
Applicable to:
The flight crew uses the thrust levers to do the following:
‐ Manually select engine thrust
‐ Arm and activate autothrust (A/THR)
‐ Engage reverse thrust
‐ Engage the takeoff and go-around modes.
When autothrust is disconnected, the thrust levers control thrust directly: each lever position
corresponds to a given thrust.
4 detents divide each of the thrust lever sectors into three segments. The detents are:
TO GA : Maximum takeoff thrust
FLX MCT : Maximum continuous thrust (or FLX at takeoff)
CL : Maximum climb thrust
IDLE : Idle thrust
When the thrust levers are at the IDLE position, the flight crew can pull the reverse levers.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 4/22
FCOM 19 AUG 10
THRUST LEVERS
Applicable to: ,
The flight crew uses the thrust levers to do the following:
‐ Manually select engine thrust
‐ Arm and activate autothrust (A/THR)
‐ Engage reverse thrust
‐ Engage the takeoff and go-around modes.
When autothrust is disconnected, the thrust levers control thrust directly: each lever position
corresponds to a given thrust.
4 detents divide each of the thrust lever sectors into three segments. The detents are:
TO GA : Maximum takeoff thrust
FLX MCT : Maximum continuous thrust (or FLX at takeoff)
CL : Maximum climb thrust
IDLE : Idle thrust
When the thrust levers are at the IDLE position, the flight crew can pull the reverse levers.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 5/22
FCOM 19 AUG 10
A/THR ARMING CONDITIONS
Applicable to:
There are a considerable number of A/THR arming conditions. The following is a list of the most
important ones:
‐ One FMGEC operative
‐ Two ADIRS operative
Three FADECs ‐ operative, and the A/THR function is available on each engine
‐ One operative FCU channel
‐ A/THR is not manually disabled (instinctive disconnect pb has not been pressed for more than
15 s).
The flight crew arms the A/THR:
‐ On ground:
• By pushing the A/THR pb on the FCU when the engines are not running, or
• By setting the thrust levers at the FLX or TOGA detent, when the engines are running.
‐ In flight:
• By pushing the A/THR pb on the FCU while the thrust levers are out of the active range, or
• While A/THR is active (“A/THR” white on the FMA), by setting all thrust levers beyond the CL
detent, or at least one lever beyond the MCT detent, or
• By engaging the go-around mode.
When the A/THR is armed:
‐ The FCU’s A/THR pb light comes on
‐ “A/THR” is displayed in blue on the FMA.
Note: At takeoff, if the thrust levers are set back to idle, the A/THR disengages and cannot be
rearmed until airborne.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 6/22
FCOM 19 AUG 10
A/THR ARMING CONDITIONS
Applicable to: ,
There are a considerable number of A/THR arming conditions. The following is a list of the most
　
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