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button is depressed on the FCU, or when the
throttle levers are moved back to the IDLE
detent. In this case, an “A/THR OFF” message
appears on the E/WD for a few seconds and a
warning sound is heard.
Thrust Limitation
During normal operations, the thrust levers
should remain in the CL detent during the
whole flight. If the autothrust system is
engaged and the levers are moved below the
CL detent (in the manual range), the thrust is
limited to the thrust lever position. If the
thrust lever position is limiting the autothrust
system, a master caution is generated and a
message is displayed on the E/WD to indicate
this. Repeated chime will sound until a
corrective action if taken.
Thrust Lock
When the autothrust system is armed with the
levers in the CL detent and the autothrust is
disengaged by pressing the FCU A/THR
pushbutton, the engine thrust remains
constant until the levers are moved out of the
CL detent. This status is shown by a flashing
THR LK message on the FMA (1st column) and
a message appears on the E/WD, asking the
pilot to move the thrust levers. Repeated
chime will sound until a corrective action if
taken.
Lateral Guidance
The lateral guidance modes provide guidance
along a lateral path according to the FCU
settings or to the flight plan stored in the
FMGC.
The pilot can control the lateral guidance
through the FCU, in which case it is a selected
lateral mode. Or he may let the FMGC manage
it, in which case it is a managed lateral mode.
Automatic Lateral Modes
During take off (as soon as the throttle levers
are in the FLEX or TOGA detent), the lateral
RWY (runway) mode automatically engages.
AUTOFLIGHT
Airbus Series Vol.1
(c) 2007 Wilco Publishing www.wilcopub.com - www.FeelThere.com 25
This mode is designed to help the pilot in
following the runway heading. In fact, it
automatically sets the ILS frequency (if it
exists) and the yaw bar is displayed on the PFD
to help the runway tracking. If the runway has
no ILS, no yaw bar is shown.
Typical FMA display when take off power is applied.
Column 3 shows the runway mode is engaged (green
RWY), and the NAV mode is armed (blue NAV).
When the aircraft reaches the altitude of 30
feet above the ground, the NAV mode
automatically engages if a flight plan is
defined. If no flight plan is defined, or if the
flight plan leads to a discontinuity, the RWY
TRK (runway track) mode automatically
engages to help the pilot in following the
runway track after take off until another
lateral mode is selected.
Selected Lateral Mode
The pilot can control the lateral guidance
manually through the FCU by pulling the HDG
(or TRK) knob on the FCU to select the heading
(or track). Depending on the FCU mode, the
heading or the track is selected.
Managed Lateral Mode
The crew can push the HDG knob to set the
heading managed mode. The NAV mode then
becomes active (shown in green on the FMA)
and the aircraft follows the flight plan entered
in the FMGC.
If the heading is in managed mode on the
ground, the NAV mode is armed (shown in blue
on the FMA). It will automatically become
active shortly after take off.
Vertical Guidance
The vertical modes provide guidance along the
vertical flight plan, according to the FMGC
flight plan and pilot inputs via the FCU.
The pilot can control the vertical guidance
manually through the FCU (selected vertical
mode) or let the FMGC manage the vertical
guidance (managed vertical mode).
The vertical modes are always on the 2nd
column of the FMA. The active mode is
displayed in green on the first line, and the
armed mode is shown on the second line in
blue.
Automatic Vertical Modes
During take off (as soon as the throttle levers
are in the FLEX or TOGA detent), the lateral SRS
(speed reference system) mode automatically
engages if some conditions are fulfilled :
• The flaps are extended,
• V2 was entered in the MCDU Take off PERF
page.
This mode is designed to manage the initial
climb, from the ground to the acceleration
altitude. It will make the aircraft climb at the
highest possible rate of climb, keeping V2+10
knots if all engines are running, otherwise V2.
This mode is very helpful, you just have to follow
the flight director after take off to make a perfect
climb.
Typical FMA display when take off power is applied.
Column 2 shows the speed reference system mode is engaged
(green SRS),and the managed climb mode is armed (blue
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