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PERF key when the climb phase is active, or by
pressing the 6R key in the PERF TO page.
The ECON speed/Mach computed by the FMGC
will be used as a speed target during the climb
phase.
The speed entered by the crew (290 kts) will be
used as the speed target during the climb
phase.
ACT MODE (1L)
The value in this field depends on the other
fields of the page.
This field displays the speed mode that is used
for the climb:
- ECON: the ECON speed/Mach combination
displayed in the ECON field (3L) will be used.
- SPEED xxx: the speed entered by the crew in
the SPD/MACH field (4L) will be used.
- MACH xxx: the Mach entered by the crew in
the SPD/MACH field (4L) will be used.
- EXPEDITE: the expedite climb mode has
been selected on the FCU. In this case, the
aircraft climbs as efficiently as possible, using
the green dot speed as the target speed.
CI (2L)
This is the Cost Index used for the climb
phase. As explained earlier (INIT A page), the
cost index determines if you want to fly slow
and far (CI near 0) or fast and not far (CI near
999).
On this page, the cost index value directly
impacts the ECON speed/Mach computed by
the FMGC. The higher it is, the higher the
speed will be, but the fuel consumption will
also be higher.
This field can be modified by the crew (blue)
only when the CLB phase is not active.
Otherwise it is displayed in blue.
ECON (3L)
This field displays the ECON speed/Mach
computed by the FMGC according to the cruise
altitude and the cost index. It is not modifiable
by the crew.
The aircraft will automatically switch from
airspeed to Mach when the crossover altitude
is reached.
If a ‘*’ character is displayed in this field, it
means this field is selectable. The pilot can
press the 3L select key to revert to the ECON
speed mode.
SPD/MACH (4L)
When the climb phase is not active, the crew
can enter a preselected speed, mach, or both
in this field to set the speed target the FMGC
will use during the climb. When a value is
entered in this field, the ACT MODE
automatically switches to SPEED xxx or MACH
xxx.
If a ‘*’ character is displayed in this field, the
pilot can press the 4L select key to revert to
FMGC
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the SPEED xxx or MACH xxx speed mode.
When the climb phase is active, this field is not
editable. The crew may select a new speed on
the FCU (by pulling the SPD/MACH knob). In
this case, the FCU selected speed is displayed
in this field.
PREV PHASE or ACTIVATE APPR PHASE (6L)
If the climb phase is active, the 6L select line
shows ‘ACTIVATE APPR PHASE’. If you press
6L, a confirmation is requested and the FMGC
switches directly to the approach phase.
Consequently, the PERF APPR page is
immediately displayed.
If the climb phase is not active, the 6L select
line lets you display the PERF TAKE OFF page.
DEST EFOB (1R)
This field displays the Estimated Fuel On
Board (EFOB) at the destination. It is not
modifiable by the crew.
PRED TO XXX (2R)
This field lets you define the altitude for which
the predictions will be computed on lines 3R,
4R and 5R. This altitude must be lower than
the cruise altitude.
Predictions (3R, 4R, 5R)
These fields show the predicted time and
distance to reach the altitude entered in 2R,
according respectively to the ECON
speed/Mach, the preselected speed/Mach and
the expedite mode.
NEXT PHASE (6R)
Pressing 6R select key displays the cruise
performance page.
TIME or UTC
On the center of the page, the time or the UTC
to the destination is displayed, depending on
the fact that the Estimated Departure Time
(ETT) has been defined or not.
PERF CRZ PAGE
This page can be accessed by pressing the
PERF key when the cruise phase is active, or
by pressing the 6R key in the PERF CLB page.
This page is very similar to the PERF CLB
page. The speed management works exactly
like for the climb, with select keys 1L to 4L.
DES FORECAST (2R)
Pressing the 2R select key brings the descent
forecast page. This page lets the crew enter
the wind information forecasted for the
descent.
DES FORECAST PAGE
This page can only be accessed from the PERF
CRZ page, by pressing the 2R select key.
WIND/ALT (1L to 4L)
The crew can enter the wind forecast for the
descent. Each information line is composed of
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Airbus_Pilots Guide_UK空客飞行员指南(49)
