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important ones:
‐ One FMGEC operative
‐ Two ADIRS operative
‐ Two FADECs operative
‐ One operative FCU channel
‐ 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 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 7/22
FCOM 19 AUG 10
A/THR ACTIVATION
Applicable to:
GENERAL
A/THR is active when it controls thrust or speed. The thrust levers position determines the
maximum􀀃thrust􀀃that􀀃the􀀃A/THR􀀃system􀀃can􀀃command􀀃(except􀀃in􀀃α-floor􀀃condition).􀀃
The A/THR being armed, is activated when the flight crew sets the thrust levers between the:
‐ CL and IDLE detents (all engines operative)
‐ 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 the IDLE position.
Note: When the flight crew sets all thrust levers to the IDLE position, A/THR disconnects.
However, if the flight crew pushes the A/THR pb on the FCU, the autothrust will be
simultaneously armed and activated. Due to the thrust levers's position, IDLE thrust will
be maintained.
When ALPHA FLOOR is activated, regardless of the initial A/THR status and position of the thrust
levers, the A/THR activates.
When A/THR is active:
‐ The FCU’s A/THR pb lights up
‐ The FMA displays A/THR mode in green (in the first column) and "A/THR" in white (in the fifth
column).
Applicable to: ,
GENERAL
A/THR is active when it controls thrust or speed. The thrust levers position determines the
maximum􀀃thrust􀀃that􀀃the􀀃A/THR􀀃system􀀃can􀀃command􀀃(except􀀃in􀀃α-floor􀀃condition).􀀃
The A/THR being armed, is activated:
‐ When the flight crew sets both thrust levers between the CL and IDLE detents (two engines
operative)
‐ When the flight crew sets one thrust lever between MCT and IDLE detents (one engine
inoperative).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 8/22
FCOM 19 AUG 10
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 the IDLE position.
Note: When the flight crew sets all thrust levers to the IDLE position, A/THR disconnects.
However, if the flight crew pushes the A/THR pb on the FCU, the autothrust will be
simultaneously armed and activated. Due to the thrust levers's position, IDLE thrust will
be maintained.
When ALPHA FLOOR is activated, regardless of the initial A/THR status and position of the thrust
levers, the A/THR activates.
When A/THR is active:
‐ The FCU’s A/THR pb lights up
‐ The FMA displays A/THR mode in green (in the first column) and "A/THR" in white (in the fifth
column).
Applicable to:
EFFECTS OF THRUST LEVER MOVEMENT DURING A/THR ACTIVATION
While A/THR is active:
‐ When all thrust levers are set above the CL detent or at least one above the MCT detent, the
A/THR reverts from active to armed. “A/THR” turns to blue on the FMA and the thrust levers
control the thrust directly. The FMA displays “MAN THR” white in its first column.
The thrust levers provide the flight crew with an immediate increase of thrust when thrust levers
are pushed above the CL detent (four engines) or the active thrust levers above the MCT detent
(one engine inoperative).
‐ When all thrust levers are set below the CL (four engines) or three thrust levers are set
　
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