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A318/A319/A320/A321 FLEET DSC-22_30-75 P 5/18
FCOM 19 AUG 10
MODE REVERSION DUE TO FCU ALTITUDE CHANGE
Applicable to:
,
,
MSN,,,,
When an OPEN mode is engaged, the aircraft climbs or descends towards the altitude set on the
FCU. If the flight crew sets the FCU altitude to a target not compatible with the active open mode, a
mode reversion occurs and V/S (or FPA) engages on current V/S (or FPA).
This reversion applies to CLB, OP CLB, DES, OP DES, EXP DES �� , EXP CLB �� .
Example: Reversion from OP CLB to V/S:
With ALT* engaged, the target altitude is changed by any value greater than 250 ft, V/S (or FPA)
engages on currents V/S (or FPA). Refer to DSC-22_30-75 Mode Reversions (Summary).
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 6/18
FCOM 19 AUG 10
If within 5 s after the reversion to V/S (FPA), the flight crew does not confirm the altitude target
change by:
‐ Pulling the ALT knob, or
‐ Setting a new V/S (or FPA) target, or
‐ Pushing the V/S or FPA knob on the FCU,
then, a triple click sounds, and the V/S (FPA) is boxed white for additional 10 s.
REVERSION WITH GLOBAL SPEED PROTECTION
Applicable to:
AUTOMATIC SPEED MODE PROTECTION IN CLIMB
FDs are engaged in an OPEN mode in climb with AP not engaged.
If FDs are engaged in CLIMB or OPEN CLIMB mode or EXP CLB �� and the flight crew does
not follow the FD bars to maintain the commanded climb (pitch too low and autothrust in maximum
climb thrust), the aircraft accelerates.
Both FDs disengage when VMAX+4 is reached (VMAX being VMO, VLE or VFE). If the A/THR is
active, it reverts to SPEED mode and reduces the thrust to recover the speed 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 7/18
FCOM 19 AUG 10
Applicable to:
,
,
MSN,,,,
AUTOMATIC SPEED MODE PROTECTION IN CLIMB
FDs are engaged in an OPEN mode in climb with AP not engaged.
If FDs are engaged in CLIMB or OPEN CLIMB mode or EXP CLB �� and the flight crew does
not follow the FD bars to maintain the commanded climb (pitch too low and autothrust in maximum
climb thrust), the aircraft accelerates.
Both FDs disengage when VMAX+4 is reached (VMAX being VMO, VLE or VFE). If the A/THR is
active, it reverts to SPEED mode and reduces the thrust to recover the speed target.
A triple click aural warning sounds.
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 8/18
FCOM 19 AUG 10
Applicable to:
AUTOMATIC SPEED PROTECTION IN V/S (OR FPA) MODE IN CLIMB
When climbing 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 decreases. When
reaching VLS (or VLS-5, if the speed target is VLS), the AP temporarily abandons the V/S target,
and automatically decreases the vertical speed to maintain VLS. 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 9/18
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 VLS is
maintained.
Applicable to:
,
,
MSN,,,,
AUTOMATIC SPEED PROTECTION IN V/S (OR FPA) MODE IN CLIMB
When climbing 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 decreases. When
reaching VLS (or VLS-5, if the speed target is VLS), the AP temporarily abandons the V/S target,
and automatically decreases the vertical speed to maintain VLS. 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 10/18
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 value 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 VLS is
maintained. However, no triple click is generated and the V/S target display on the FMA
　
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