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the display mode. If HDG-VS mode is
selected, the heading and the vertical speed
(in feet per minute) are shown. If the TRKFPA
mode is selected, the track and the
flight path angle (in degrees) are displayed.
• The METRIC ALT pushbutton triggers the
display of the altitude in meters on the
Primary Flight Display.
• The six engagement pushbuttons (AP1,
AP2, A/THR, EXPED, LOC, APPR) will be
described later in this chapter.
The four rotating knobs are the following :
• The airspeed knob controls the airspeed,
in knots or in Mach depending on the mode
selected with the SPD/MACH pushbutton.
It can be pushed to have the speed
managed by the flight management
system.
• The heading knob allows the pilot to select
the heading or track, depending on the
mode selected with the HDG-V/S / TRKFPA
pushbutton. It can be pushed to have
the lateral navigation managed by the
flight management system.
• The altitude knob controls the target
altitude. It can be pushed to have the
vertical navigation managed by the flight
management system.
• The vertical speed (V/S) knob controls the
vertical speed in feet per minute or the
flight path angle (FPA), depending on the
mode selected with the HDG-V/S / TRKFPA
pushbutton. The vertical speed can
not be managed. If the knob is pushed, it
triggers a level off action.
The FCU has four windows, corresponding to
the four knobs:
• The speed window displays the target
speed, in knots or Mach. If the speed is
managed, it is dashed and the managed
speed light is on.
• The heading window displays the target
heading or track. If the lateral navigation is
managed, it is dashed and the managed
heading light is on.
• The altitude window shows the target
altitude. It is never dashed. The light is on as
soon as the altitude displayed is higher than
the acceleration altitude entered in the MCDU
(refer to the FMGC section for more details).
• The vertical speed window shows the
vertical speed in feet per minute, or the
flight path angle in degrees.
Selected Functions
When airspeed, heading or vertical speed
value is selected, it can be adjusted by turning
the corresponding knob until the desired value
is displayed in the FCU window.
In the example shown below, the speed,
heading and vertical speed are selected, and
their values are 210 knots, 12° heading and a
2100 feet per minutes to climb to the altitude
of 25000 feet (FL250).
FCU knob rotation in Flight Simulator :
The knob rotation is simulated by clicking on the
left/right of the knob to decrease/increase the
corresponding value. For the vertical speed knob, you
have to click above/below the V/S knob to
increase/decrease the value.
As soon as you move the mouse in one of the sensitive
area used for rotation, the hand cursor appears with a
+ (plus) or a – (minus) to indicate the possible
variation. If you click the left mouse button, it
commands a normal value change. If you click the
right mouse button, it makes a bigger incremental
change.
Airbus Series Vol.1
AUTOFLIGHT
(c) 2007 Wilco Publishing www.wilcopub.com - www.FeelThere.com 19
The value changes are summarized in the table
below :
Function Button mouse click Variation
Airspeed (knots) Left +/- 1 knot
Right +/- 10 knots
Airspeed (MACH) Left +/- .01
Right +/- .10
Heading/Track Left +/- 1°
Right +/- 10°
Altitude Left +/- 100 feet
Right +/- 1000 feet
Vertical Speed Left +/- 100 ft/min
Right +/- 1000 ft/min
Mouse wheel usage :
When the mouse cursor is moved over a knob or over
a variation zone, you can use the mouse wheel to
adjust the value. Turning the mouse wheel normally
commands a normal variation. Turning the mouse
wheel while pressing one of the Shift keys
commands bigger variations.
If you want to change the altitude selection,
you must first turn the altitude knob to display
the desired target altitude. Then you can
initiate the climb or descent by one of the
following actions :
• Pull the altitude knob. This will make the
altitude ‘selected’ and it will result in an
open climb or open descent.
• Push the altitude knob. The altitude is now
‘managed’ and it will result in a managed
climb or descent.
• Pull the V/S knob, and select a vertical
speed.
• Press the EXPED pushbutton, which will
result in an expedited climb or descent.
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