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Speed Guidance
It is mainly related to the autothrust system.
Autothrust arming
If the autothrust system is off, it is armed
when the throttle levers are moved to the
FLX/MCT or TOGA detent during take off, or
when the levers are moved in the TOGA detent
while the aircraft is in flight and the flaps are
extended (go around).
When the autothrust system is armed, the
A/THR light illuminates on the FCU panel, and
a blue A/THR message appears on the FMA.
Note that the A/THR button light also
illuminates when the autothrust is active. This
is why the pilot must look at the FMA (column
5) to determine if it is armed or active.
Typical FMA display when take off power is applied.
The first column shows FLEX power is selected,
and column 5 shows the autothrust system is armed.
When the autothrust system is armed, only the
fixed thrust modes (constant thrust provided)
are available :
• TOGA - Take off / Go around :
This mode provides the maximum thrust,
“MAN TOGA” is displayed on the FMA
(column 1).
• FLX – Flex :
It is used for reduced thrust take off. The
provided thrust depends on the
temperature that is entered in the MCDU
PERF page. If the aircraft is on the ground,
“MAN FLX” message is displayed on the
FMA (column 1) with the selected
temperature in blue.
If the flex mode is used for take off and no
temperature has been entered in the
MCDU, a message “FLX TEMP NOT SET”
appears on the E/WD. In this case, the take
off should continue in TOGA mode by
pushing the throttle levers into the TOGA
detent. This removes the caution message.
• MCT - Maximum continuous thrust :
It provides a fixed thrust that is the
maximum continuous thrust depending on
the current conditions. This is the normal
lever position if an engine fails.
• CL – Climb :
Climb thrust is provided based on the
current conditions. A message “THR CLB”
is displayed on the FMA when the fixed
climb thrust is provided. The aircraft speed
is then controlled by the pitch (used for
climb).
• IDLE :
This mode provides fixed idle thrust. A
message “THR IDLE” is displayed on the
FMA when the fixed idle thrust is provided,
and a flashing “IDLE” message is shown on
the E/WD when the engine power is idle.
The aircraft speed is then controlled by the
pitch (used for open descent).
The autothrust mode is displayed on the FMA,
column 1. When armed, the autothrust mode
Airbus Series Vol.1
24 For Microsoft Flight Simulator use only. Not for use in real aviation.
is displayed in white inside a white bordered
box.
The autothrust is disarmed when the A/THR
button is depressed on the FCU, or when the
throttle levers are moved back to the IDLE
detent.
Autothrust Active
If the autothrust system is armed, it becomes
active when the throttle levers are moved into
the CL detent. If it is off, it can be made active
by pressing the A/THR button on the FCU.
When the autothrust system is active, the
A/THR light illuminates on the FCU panel, and
a white A/THR message appears on the FMA
(column 5). The thrust mode displayed in the
1st column of the FMA appears in green.
When the autothrust is active, the fixed and
variable thrust modes are available. In this
mode only, the autothrust fully controls the
thrust to maintain selected or managed speed
in level flight or when the aircraft is following
a specific vertical path (ILS approach for
example).
Variable thrust modes are :
• SPEED
This mode is available only when the
autothrust system is active. A “SPEED”
message is displayed in green on the FMA
(column 1) when this mode is engaged.
The autothrust automatically switches to
this mode when :
– the aircraft levels off from a climb or a
descent,
– a vertical guidance mode that commands
a specific vertical path (V/S or ILS mode)
is engaged,
– The flight directors are turned off.
• MACH
It is the same as the SPEED mode. It is only
available at high altitudes. The autothrust
system automatically switches from
SPEED to MACH and vice-versa at a
predetermined altitude.
The autothrust system can be changed to
armed mode by moving the throttle levers
forward into the FLX/MCT or TOGA detent.
The autothrust is de-activated if the A/THR
button is depressed on the FCU, or when the
throttle levers are moved back to the IDLE
　
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