AIRCRAFT SYSTEMS - e-Crew

A330/A340
FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
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 °.
Applicable to: MSN 0970-1002
A/THR MODE REVERSION
CONDITIONS EVENT CONSEQUENCES
‐ A/THR active in THR mode
Aircraft speed = VLS (VMAX)
‐ A/THR reverts to SPD mode
‐ AP OFF
‐ FD bars are removed
‐ FD engaged
‐ DES or OP DES engaged (CLB, or OP
CLB)
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.
RJA A330/A340 FLEET DSC-22_30-90 P 21/22
FCOM ← J → 03 MAY 11