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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 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. A triple-click aural warning sounds.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 10/16
FCOM 19 AUG 10
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 FMGES 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 11/16
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 VMAX
is maintained.
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 FMGES 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 12/16
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 VMAX
is maintained. However, no triple click is generated and the V/S target display on the
FMA remains unchanged.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
MODE REVERSIONS
A330/A340 FLEET DSC-22_30-75 P 13/16
FCOM 19 AUG 10
MODE REVERSIONS (SUMMARY)
Applicable to:
REVERSION DUE TO FCU ALTITUDE CHANGES
CONDITIONS ACTION CONSEQUENCE
OP CLB engaged
CLB engaged
FCU selected altitude set below A/C altitude
OP DES engaged
DES engaged
FCU selected altitude set above A/C altitude
ALT* active FCU selected altitude modification (greater than
250 ft)
V/S-FPA engages on current V/S-FPA
REVERSION DUE TO THE LOSS OF NAV MODE
CONDITIONS EVENT CONSEQUENCE
CLB engaged OP CLB engages
DES engaged
Loss of lateral managed mode: NAV
V/S engages
SPEED PROTECTION WHEN FD ORDERS ARE NOT FOLLOWED BY THE FLIGHT CREW
(AP
NOT ENGAGED)
CONDITIONS EVENT CONSEQUENCE
FD ‐ engaged only (no AP) and
‐ OP DES or DES engaged
‐ A/THR active (IDLE thrust)
IAS = VLS-2
(if speedbrakes are
extended between VLS-2
and VLS-19)
FD bars disappear.
If A/THR active, automatic engagement of SPEED mode
on the A/THR.
Thrust increases to recover the speed target.
‐ FD engaged only (no AP) and
‐ OP CLB or CLB engaged
‐ A/THR active (CLIMB thrust)
IAS = VMAX+4
VMAX = VFE or VLE or
VMO/MMO
FD bars disappear.
If A/THR active, automatic engagement of SPEED mode
on the A/THR.
Thrust decreases to recover the speed target.
SPEED PROTECTION DUE TO EXCESSIVE V/S
CONDITIONS EVENT CONSEQUENCE
Excessive V/S or FPA selected in
climb
IAS = VLS
(or VLS-5, if target = VLS)
‐ Excessive V/S or FPA selected
in descent, and
‐ Clean configuration
IAS = VMAX
‐ Excessive V/S or FPA <0
selected in descent, and
‐ Configuration other than clean
IAS = VMAX
　
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