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CLB).
As soon as the acceleration altitude is
reached, the vertical mode automatically
switches to CLB mode.
Selected Vertical Modes
The pilot can control the vertical guidance
manually through the FCU by doing the
following actions :
• Select a new altitude on the FCU using the
altitude knob,
• Then select a vertical mode using the
altitude knob, the V/S knob or the EXPED
button. This action will determine the
vertical mode that will be used to fly the
aircraft : V/S, FPA, Open Climb or Open
AUTOFLIGHT
Airbus Series Vol.1
26 For Microsoft Flight Simulator use only. Not for use in real aviation.
Descent.
Open Climb (OP CLB)
This mode is used to climb at a selected altitude
without taking care of any altitude constraint.
This mode is linked to the THR CLB autothrust
mode (fixed thrust mode with N1 set according to
the CLB thrust setting). When this mode is active,
the current selected or managed target speed is
held and the pitch is adjusted consequently. This
is why the V/S FCU display is dashed.
If the EXPED mode is engaged when the open
climb mode is active, the aircraft will climb as
quickly as possible, using the green dot speed
as the target speed.
The open climb mode can be engaged only
when the autopilot and autothrust systems are
active, by the following actions :
1. Select an altitude that is higher than the
current altitude on the FCU,
2. Pull the altitude knob.
Note : If the altitude change is less than 1.200
feet, the vertical speed will be set automatically
to 1.000 feet/min and the FMA
indications don’t change.
In open climb, the FMA looks like this :
Open Descent (OP DES)
This mode is similar to the open climb mode,
used for the descent. It allows the descent at a
selected altitude without honoring any altitude
constraint. It is linked to the THR IDLE
autothrust mode, which means the engines
power will be set to IDLE.
If the EXPED mode is engaged when the open
descent mode is active, the aircraft will
descend as quickly as possible, using the
maximum speed of 340 kts/ Mach .80 as the
target speed (potentially limited by the VMAX
speed).
The open descent mode can be engaged only
when the autopilot and autothrust systems are
active, by the following actions :
3. Select an altitude that is lower than the
current altitude on the FCU,
4. Pull the altitude knob.
Note : The open descent should not be used at
low altitudes.
Vertical Speed / Flight Path Angle (VS or FPA)
These modes let the pilot control the climb or
descent through the vertical speed or the
flight path angle (depending on the FCU mode,
V/S – HDG or TRK – FPA). Consequently, the
FCU V/S or FPA display shows the selected
value.
These modes are linked to the Speed/Mach
autothrust mode (variable thrust mode that
adjusts the engine power according to the
speed target).
The FMA displays the selected mode (V/S or
FPA) with the current selected value in blue.
In V/S mode, the FMA and FCU may look like
this :
In FPA mode, they may look like this :
Managed Vertical Modes
In Managed vertical mode, the FMGC determines
the best climb or descent profile.
By default, the CLB mode (climb mode) is
armed when the aircraft is on the ground. It is
AUTOFLIGHT
Airbus Series Vol.1
(c) 2007 Wilco Publishing www.wilcopub.com - www.FeelThere.com 27
shown in blue on the FMA. It means the climb
mode will be automatically activated as soon
as the aircraft reaches the acceleration
altitude set in the MCDU (refer to the FMGC
section to know more about the acceleration
altitude).
Managed Climb
The managed climb can be set at any time by
selecting a higher altitude on the FCU and
pushing the ALT knob. The managed climb can
be activated only if the NAV mode is active
(lateral mode managed).
The managed climb is very similar to the open
climb mode described earlier. The only
difference is that the managed climb mode
respects the altitude constraints. If there is no
constraint, the open climb and managed climb
modes are just the same.
If an altitude constraint is defined on the next
waypoint, the managed climb mode respects it by
limiting the target altitude to the altitude
constraint value. In other words, the target altitude
will be the altitude constraint, even if the altitude
displayed on the FCU is higher. In this situation, the
target altitude symbol appears in magenta on the
altitude tape, and the ALT message is shown in
　
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