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Further failures result in pitch alternate and roll direct.
The autopilot may be available, depending on the cause and type of failure(s).
DIRECT LAW
The sidestick is directly coupled to the controls via the computers, but without any of the
stabilization feedbacks. In effect, this law turns the aircraft into a conventional aircraft, but is
compensated for configuration and CG. The pilot must use manual pitch trim, as signaled on the
PFD. The autopilot is not available.
MECHANICAL BACKUP
The pilot can use the pitch trim and rudder to control the aircraft for short periods of total loss of
fly-by-wire.
Applicable to: ,
ALTERNATE LAW
Pitch alternate and roll normal is the first level of degraded control law.
Further failures result in pitch alternate and roll direct.
The autopilot may be available, depending on the cause and type of failure(s).
DIRECT LAW
The sidestick is directly coupled to the controls via the computers, but without any of the
stabilization feedbacks. In effect, this law turns the aircraft into a conventional aircraft, but is
compensated for configuration and CG. The pilot must use manual pitch trim, as signaled on the
PFD. The autopilot is not available.
BACKUP
The pilot can use the pitch trim and rudder to control the aircraft for short periods of total loss of
fly-by-wire.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
FLIGHT CONTROLS (FLYING CONDITIONS) - ABNORMAL OPERATIONS
A330/A340 FLEET PRO-SUP-27-30 P 5/8
FCOM 19 AUG 10
Applicable to:
ALTERNATE LAW
PITCH
Alternate law in pitch is almost the same for the pilot, as normal control law.
However, alternate law does not maintain any of the protections, except maneuver protection.
As a result, the pilot must fly the aircraft more attentively to avoid inadvertently exceeding the
normal limits.
Alternate law reduces MMO to0.82, and VMO to 305 kt.
At low speed, the change in the speed scale is very noticeable. VLS remains, but Vα PROT and
Vα MAX disappear, replaced by a single black and red strip, the top of which is stall warning
speed. Unlike VLS, which is stable, VSW is g sensitive so as to give additional margin in turns.
As mentioned above, ALTERNATE reverts to FLARE law for landing at 100 ft.
ROLL
Roll control is direct. The roll rate is generally higher than with normal law and, at first, the
aircraft appears to be very sensitive.
Bank stability and limits are no longer active, and the flight crew should be careful to remain
within normal limits.
Applicable to:
ALTERNATE LAW
PITCH
Alternate law in pitch is almost the same for the pilot, as normal control law.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
FLIGHT CONTROLS (FLYING CONDITIONS) - ABNORMAL OPERATIONS
A330/A340 FLEET PRO-SUP-27-30 P 6/8
FCOM 19 AUG 10
However, alternate law does not maintain any of the protections, except maneuver protection.
As a result, the pilot must fly the aircraft more attentively to avoid inadvertently exceeding the
normal limits.
Alternate law reduces MMO to0.82, and VMO to 305 kt.
At low speed, the change in the speed scale is very noticeable. VLS remains, but Vα PROT and
Vα MAX disappear, replaced by a single black and red strip, the top of which is stall warning
speed. Unlike VLS, which is stable, VSW is g sensitive so as to give additional margin in turns.
As mentioned above, ALTERNATE reverts to FLARE law for landing at 100 ft.
ROLL
Roll control is direct. The roll rate is generally higher than with normal law and, at first, the
aircraft appears to be very sensitive.
Bank stability and limits are no longer active, and the flight crew should be careful to remain
within normal limits.
Applicable to:
ALTERNATE LAW
PITCH
Alternate law in pitch is almost the same for the pilot, as normal control law.
However, alternate law does not maintain any of the protections, except maneuver protection.
As a result, the pilot must fly the aircraft more attentively to avoid inadvertently exceeding the
normal limits.
Alternate law reduces MMO to0.82.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SUPPLEMENTARY PROCEDURES
FLIGHT CONTROLS (FLYING CONDITIONS) - ABNORMAL OPERATIONS
A330/A340 FLEET PRO-SUP-27-30 P 7/8
FCOM 19 AUG 10
At low speed, the change in the speed scale is very noticeable. VLS remains, but Vα PROT and
Vα MAX disappear, replaced by a single black and red strip, the top of which is stall warning
speed. Unlike VLS, which is stable, VSW is g sensitive so as to give additional margin in turns.
　
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