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white in the FMA 5th column.
The position of the thrust levers determines whether A/THR is armed, active, or disconnected.
The autothrust system, when active:
‐ 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 FMGS 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, FG 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.
THRUST LEVERS
Applicable to: ALL
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.
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 2/16
FCOM 19 AUG 10
When autothrust is disconnected, the thrust levers control thrust directly: each lever position
corresponds to a given thrust.
Five detents divide each of the thrust lever sectors into four segments. The detents are:
TO GA : Max takeoff thrust
FLX MCT : Max continuous thrust (or FLX at takeoff)
CL : Maximum climb thrust
IDLE : Idle thrust for both forward and reverse thrust
MAX REV : Maximum reverse thrust
When the thrust levers are at the IDLE position, the flight crew can pull them up to clear the IDLE
stop and select reverse thrust. (There is no reverse detent as such).
A/THR ARMING CONDITIONS
Applicable to: ALL
Arming conditions of the A/THR are numerous. The following is a list of the most important ones:
‐ One FMGC operative
‐ One FAC operative
‐ Two ADIRS operative
‐ Two FADECs operative
‐ One channel of the FCU operative
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 3/16
FCOM 19 AUG 10
‐ One LGCIU operative
‐ A/THR is not manually disabled (instinctive disconnect pb has not been pressed for more than
15 s).
The flight crew arms 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 above 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 the aircraft becomes airborne.
A/THR ACTIVATION
Applicable to: ALL
GENERAL
The A/THR is active when it controls thrust or speed. The position of the thrust lever determines
the maximum thrust that the A/THR system can command (except in α-floor condition).
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 4/16
FCOM 19 AUG 10
The A/THR being armed, is activated:
When the flight crew sets both thrust levers between ‐ the CL and IDLE detents (two engines
operative), or
‐ When the flight crew sets one thrust lever between the MCT and IDLE detents (one engine
inoperative).
The A/THR being disconnected, is activated when the flight crew pushes the A/THR pb on the
FCU while the thrust levers are within the active range, including IDLE position.
Note: When the flight crew sets both thrust levers to IDLE position, the A/THR disconnects
but, if the flight crew pushes the A/THR pb of the FCU, they will simultaneously arm and
　
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