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The gust taken into account is only 1/3 of the instantaneous difference between CURRENT
HEADWIND and the TWR HEADWIND COMPONENT. This is done to prevent any important
thrust variation in late final.
The minimum and maximum values remain unchanged.
GROUND SPEED MINI (GS MINI) COMPUTATION
Ground speed mini concept has been defined to prevent the aircraft energy from dropping below a
minimum level during final approach. The GS mini value is not displayed to the flight crew.
EXAMPLE
Approach on runway 09, the tower wind direction is on the runway axis.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 18/22
FCOM 19 AUG 10
IAS TARGET VALUES
If we turn the previously explained speed target definition into formulae, we obtain the following
result:
ABOVE 400 FT:
IAS TARGET = Max [VAPP, (VAPP + CURRENT HEADWIND - TWR HEADWIND)] (1)
CurrentWind in Approach IAS Target
(a) 090/50 Max [VAPP, (140+50-30)] = 160 kt
(b) 090/10 Max [VAPP, (140+10-30)] = 140 kt
(c) 270/10 Max [VAPP, (140+0-30)] = 140 kt
(d) 090/30 Max [VAPP, (140+30-30)] = 140 kt
(1) For this computation, the TWR HEADWIND is voluntarily limited to 10 kt as a minimum.
BELOW 400 FT:
IAS TARGET = Max [VAPP, VAPP + 1/3 (CURRENT HEADWIND - TWR HEADWIND)]
That is equivalent to:
IAS TARGET = Max (VAPP, VLS + 1/3 of CURRENT HEADWIND COMPONENT)
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 19/22
FCOM 19 AUG 10
CurrentWind in Approach IAS Target
(e) 090/36 Max [VAPP, (130+12)] = 142 kt
A/THR MODE REVERSION
Applicable to:
CONDITIONS EVENT CONSEQUENCES
‐ A/THR active in THR mode
‐ AP OFF
‐ FD engaged
‐ DES or OP DES engaged (CLB, or OP
CLB)
Aircraft speed = VLS (VMAX) ‐ A/THR reverts to SPD mode
‐ FD bars are removed
For more details, Refer to DSC-22_30-75 General.
ALPHA FLOOR
ALPHA FLOOR protection is triggered when the FMGECs receive a signal elaborated by the
PRIMs. This signal is sent when the aircraft’s angle of attack is above a pre-determined threshold
function of the aircraft’s configuration. A/THR is automatically activated and commands TOGA
thrust, regardless of the thrust levers positions. This protection is available from liftoff to 100 ft RA
in approach.
The following indications are then provided:
‐ A-FLOOR􀀃on􀀃the􀀃FMA􀀃and􀀃on􀀃the􀀃EWD,􀀃as􀀃long􀀃as􀀃α􀀃floor􀀃conditions􀀃are􀀃met􀀃
‐􀀃TOGA􀀃LK􀀃on􀀃the􀀃FMA,􀀃when􀀃the􀀃aircraft􀀃leaves􀀃the􀀃α􀀃floor􀀃conditions.
TOGA thrust is then frozen.
A-FLOOR and TOGA LK are displayed in green, and outlined with a flashing amber box.
In order to cancel ALPHA FLOOR or TOGA LK thrust, disconnect the A/THR.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A330/A340 FLEET DSC-22_30-90 P 20/22
FCOM 19 AUG 10
Note: ALPHA FLOOR is inhibited:
‐ In case of a single outer engine failure, with the flaps extended
‐ In case of a single outer engine failure, with derated TO selected
‐ In case of a dual engine failure on the same wing
‐ Below 100 ft at landing
‐ Above M 0.53.
ALPHA FLOOR protection is lost in case of an A/THR failure.
CAUTION The system may consider an outer engine to be failed when this engine’s Thrust
Lever Angle (TLA) is below 5 °, and the TLA of at least one other engine is above
5 °. Therefore, ALPHA FLOOR may be inhibited.
In manual thrust control, when simultaneously moving all thrust levers back to
about the IDLE position, and in order to avoid undue ALPHA FLOOR inhibition,
check that all levers are well aligned and that no TLA is below 5 °.
A/THR MODE REVERSION
Applicable to: ,
CONDITIONS EVENT CONSEQUENCES
‐ A/THR active in THR mode
‐ AP OFF
‐ FD engaged
‐ DES or OP DES engaged (CLB, or OP
CLB)
Aircraft speed = VLS (VMAX) ‐ A/THR reverts to SPD mode
‐ FD bars are removed
For more details, Refer to DSC-22_30-75 General.
ALPHA FLOOR
ALPHA FLOOR protection is triggered when the FMGECs receive a signal elaborated by the
PRIMs. This signal is sent when the aircraft’s angle of attack is above a pre-determined threshold
function of the aircraft’s configuration. A/THR is automatically activated and commands TOGA
　
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