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FCOM 19 AUG 10
With ALT* engaged, if 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).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 5/16
FCOM 19 AUG 10
If within 5 s after the reversion to V/S (or 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 ALT pb on the FCU,
then, a triple click aural warning sounds, and the V/S (or FPA) is boxed white for additional 10 s.
REVERSION - SPEED PROTECTIONS
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 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 6/16
FCOM 19 AUG 10
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 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.
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 FMGES 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 7/16
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 FMGES adjusts the pitch bar so that VLS is
maintained
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 FMGES 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 8/16
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 FMGES adjusts the pitch bar so that VLS is
maintained. However, no triple click is generated and the V/S target display on the FMA
remains unchanged.
Applicable to:
AUTOMATIC SPEED MODE PROTECTION IN DESCENT
FDs are engaged in an OPEN mode in descent with the AP not engaged.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 9/16
FCOM 19 AUG 10
If the FDs are engaged in DES or OP DES mode 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).
The A/THR, if active, reverts to SPEED mode upon FDs disengagement, and increases thrust to
recover the speed target.
　
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