-
FCU level reduced to the FMS constraint with the ALT or ALT ACQ mode active
-loss of NAV mode with ALT or ALT ACQ mode active
-switching to descent or approach phase
-loss of flight profile validity with the ALT or ALT ACQ mode active.
2 Climb mode active
_
The conditions required for the climb in automatic
level-change control are as follows:
-FCU level above the aircraft level
-arming of the ALT ACQ mode possible
-five seconds after lift off
-descent and approach phases not active
-NAV mode active
-flight profile valid
-G/S TRACK, LAND TRACK modes not active.
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3
_
4
_
If these conditions are met, the CLB mode can be activated by one of the conditions below:
-acceleration altitude reached with the CLB mode armed
-altitude constraint met with the CLB mode armed
-IM CLB mode is engaged by pushing action on the altitude selector if : . The ALT ACQ or ALT mode or ALT submode of V/S - FPA mode is not active . The ALT ACQ or ALT mode or ALT submode of V/S FPA mode is active, the CLB mode is not armed and the FMS does not permit arming of CLB mode.
DES mode armed The DES mode is armed except in takeoff or go around phases and on condition that :
-FCU level lower than the aircraft level
-NAV, LOC CPT, LOC TRACK modes active
-flight profile available
and one of the following conditions is met :
-capture of an altitude constraint provided by the FMS
-push action on the altitude selector knob, with ALT ACQ mode, ALT mode or ALT submode active and provided that FMS enables arming of DES mode.
The DES mode is disarmed through one of the conditions below:
-engagement of the V/S, FPA, EXP (if fitted), DES, G/S CPT, FINAL DES, GO AROUND, OPEN CLB, OPEN DES modes
-FCU level higher than the aircraft level
-loss of NAV, LOC CPT, LOC TRACK modes
-switching to takeoff, go around or climb phase
-loss of flight profile validity
-FCU level reduced to the FMS constraint with ALT ACQ mode active.
DES mode active
This mode is active on condition that:
-the FCU level is below the aircraft level
-arming of the ALT ACQ mode is possible
-the NAV, LOC CPT or LOC TRACK modes are active
-five s after lift off
-
the takeoff, climb, go around phases are not active
-
the flight profile is valid
-
the active modes are not GS TRACK, LAND TRACK, DESCENT,
FINAL DES, TAKEOFF or GO AROUND. If these conditions are met, the DES mode engages except in climb phase when an altitude constraint is met with the DES mode armed.
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-
The ALT ACQ or ALT mode or ALT submode of V/S FPA mode is not active
-
The ALT ACQ or ALT mode or ALT submode of V/S FPA mode is active, the DES mode is not armed and the FMS does not permit arming of DES mode.
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D. Displays Associated with the Cruise Modes
(1) FMA
(a) Messages concerning the lateral AP/FD modes
1_ General rules
The active mode is always indicated in plain language.
The first line indicates the active mode in green.
The second line indicates the mode armed in cyan.
a List of messages
_ 1st line NAV, HDG, TRACK, LOC*, LOC 2nd line NAV, LOC
(b) Messages concerning the longitudinal AP/FD modes
1 General rules
_ On the first line, the message is always indicated in plain language except in ALT mode on the cruise flight level with A/THR engaged and NAV mode active where three dashes are displayed. The first line indicates the active mode in green. The second line indicates the mode armed in cyan. The messages which concern an FMS altitude constraint are displayed in magenta.
2 List of messages
_ 1st line ALT*, ALT, ALT CRZ, ALT CST*, V/S +/- xxxx, FPA +/- x.x deg., EXP CLB, EXP DES, CLB, DES, OP CLB, OP DES 2nd line ALT, CLB, DES. 3rd line xxx, .xx When a preset speed or Mach value has been introduced in the MCDU, the value is displayed with the mode armed when the aircraft is in the flight segment which precedes acceptance of this preset value (SPEED SEL: XXX or MACH SEL: .XX).
(2) FCU "Automatic Control" Lights The FCU has three lights which come on whenever the automatic control is active or armed. These lights concern:
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