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remains unchanged.
Applicable to:
AUTOMATIC SPEED MODE PROTECTION IN DESCENT
FDs are engaged in an OPEN mode in descent with the AP not engaged.
If the FDs are engaged in DES, or OP DES mode, or EXP DES �� and, if the flight crew does not
follow the FD bars to maintain the commanded pitch, the aircraft decelerates (insufficient descent
rate and idle thrust).
If the airspeed reaches VLS-2, both FDs disengage. (If speedbrakes are extended, the FDs
disengage between VLS-2 and VLS-19, depending on the position of the speedbrakes).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A318/A319/A320/A321 FLEET DSC-22_30-75 P 11/18
FCOM 19 AUG 10
The A/THR, if active, reverts to SPEED mode upon FDs disengagement, and increases thrust to
recover the speed target.
Applicable to:
,
,
MSN,,,,
AUTOMATIC SPEED MODE PROTECTION IN DESCENT
FDs are engaged in an OPEN mode in descent with the AP not engaged.
If the FDs are engaged in DES, or OP DES mode, or EXP DES �� and, if the flight crew does not
follow the FD bars to maintain the commanded pitch, the aircraft decelerates (insufficient descent
rate and idle thrust).
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A318/A319/A320/A321 FLEET DSC-22_30-75 P 12/18
FCOM 19 AUG 10
If the airspeed reaches VLS-2, both FDs disengage. (If speedbrakes are extended, the FDs
disengage between VLS-2 and VLS-19, depending on the position of the speedbrakes).
The A/THR, if active, reverts to SPEED mode upon FDs disengagement, and increases thrust to
recover the speed target.
A triple-click aural warning sounds.
Applicable to:
AUTOMATIC SPEED PROTECTION IN V/S (OR FPA) MODE IN DESCENT
When descending with V/S mode engaged: If the selected V/S value is excessive (with regards to
thrust and speed), the FMGS maintains the V/S target, but the airspeed increases. When reaching
VMAX (VMO or VLE in clean, or VFE+4 kt), the AP temporarily abandons the V/S target, and
automatically decreases the vertical speed to maintain VMAX.
The same applies if FPA mode is used with an excessive FPA target.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A318/A319/A320/A321 FLEET DSC-22_30-75 P 13/18
FCOM 19 AUG 10
V/S mode remains engaged. The V/S target does not change, but is no longer followed.
Note: When flying with FD bars only (AP OFF), the FMGS adjusts the pitch bar so that VMAX
is maintained.
Applicable to:
,
,
MSN,,,,
AUTOMATIC SPEED PROTECTION IN V/S (OR FPA) MODE IN DESCENT
When descending with V/S mode engaged: If the selected V/S value is excessive (with regards to
thrust and speed), the FMGS maintains the V/S target, but the airspeed increases. When reaching
VMAX (VMO or VLE in clean, or VFE+4 kt), the AP temporarily abandons the V/S target, and
automatically decreases the vertical speed to maintain VMAX.
The same applies if FPA mode is used with an excessive FPA target.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A318/A319/A320/A321 FLEET DSC-22_30-75 P 14/18
FCOM 19 AUG 10
V/S mode remains engaged.
On the FMA, the V/S target is boxed with a flashing amber rectangle, and the V/S values pulses.
Besides, an aural triple click is generated.
Note: When flying with FD bars only (AP OFF), the FMGS adjusts the pitch bar so that VMAX
is maintained. However, no triple click is generated and the V/S target display on the
FMA remains unchanged.
MODE REVERSIONS (SUMMARY)
Applicable to:
There are only 2 types of vertical mode reversions on aircraft equipped with global speed protection.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A318/A319/A320/A321 FLEET DSC-22_30-75 P 15/18
FCOM 19 AUG 10
REVERSION DUE TO A CHANGE OF THE FCU SELECTED ALTITUDE
Vertical Mode Engaged FCU Altitude Selection Change Vertical Mode Switches to
CLB - OP CLB
EXP CLB �� Below aircraft altitude
DES - OP DES
EXP DES �� Above aircraft altitude
ALT* ACTIVE Any change
V/S on current V/S
REVERSION DUE TO THE LOSS OF NAV MODE (MANUAL OR AUTOMATIC)
CONDITIONS EVENT CONSEQUENCE
CLB engaged OP CLB engages
DES engaged Loss of NAV mode V/S engages
SPEED PROTECTION WHEN FD ORDERS ARE NOT FOLLOWED BY THE FLIGHT CREW (AP
NOT ENGAGED)
CONDITIONS EVENT CONSEQUENCE
　
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