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Note: In Engine Out conditions, the SRS mode does not automatically disengage at EO ACC
ALT. (Refer to DSC-22_20-60-40 GENERAL).
GA TRK disengages when the flight crew engages another lateral mode above 100 ft RA. In dual AP
configuration, disengagement of the go-around mode, on either axis, causes AP2 to disconnect.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AP/FD COMMON MODES - GO AROUND (GA)
A330/A340 FLEET DSC-22_30-80-40 P 2/2
FCOM 19 AUG 10
DISENGAGEMENT CONDITIONS
Applicable to: ,
The SRS mode disengages:
‐ Automatically, at the go-around acceleration altitude (GA ACC ALT), or if ALT* or ALT CST* mode
engages (above 400 ft RA)
‐ If the flight crew engages another vertical mode
‐ If the flight crew selects a speed while in SRS mode: SRS reverts to OP CLB mode and a
triple-click aural warning is heard.
Note: In Engine Out conditions, the SRS mode does not automatically disengage at EO ACC
ALT. (Refer to DSC-22_20-60-40 GENERAL).
GA TRK disengages when the flight crew engages another lateral mode above 100 ft RA. In dual AP
configuration, disengagement of the go-around mode, on either axis, causes AP2 to disconnect.
GUIDANCE
Applicable to: ALL
The SRS law maintains the current speed at Go-around engagement, or VAPP, whichever is higher.
Nevertheless, the SRS speed is limited to VLS+25 kt in normal engine configuration and VLS+15 kt
in engine out. When the SRS mode disengages, the target speed becomes Green Dot speed.
GA TRK mode guides the aircraft along the current track at Go-around initiation.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 1/22
FCOM 19 AUG 10
GENERAL
Applicable to:
The autothrust (A/THR) is a function of the FMGES, it includes two independent A/THR commands,
one per FMGEC. Each one is able to control the thrust of the four engines simultaneously through
four Engine Interface Units and four Engine Control Units. Only one FMGEC controls the active
A/THR, it is called the master FMGEC.
Thrust is controlled:
‐ Automatically when the A/THR is active
‐ Manually by the flight crew.
The autothrust is active when the A/THR pb of the FCU is lighted green and A/THR is displayed
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 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 2/22
FCOM 19 AUG 10
GENERAL
Applicable to: ,
The autothrust (A/THR) is a function of the FMGES, it includes two independent A/THR commands,
one per FMGEC. Each one is able to control the thrust of both engines simultaneously through
two Engine Interface Units and two Electronic Engine Controls (PW or RR engines) or two Engine
Control Units (GE engines). Only one FMGEC controls the active A/THR, it is called the master
FMGEC.
Thrust is controlled:
‐ Automatically when the A/THR is active
‐ Manually by the flight crew.
The autothrust is active when the A/THR pb of the FCU is lighted green and A/THR is displayed
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:
　
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