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Applicable to:
MECHANICAL RUDDER CONTROL
Conventional mechanical rudder control is available from the pilot's rudder pedals.
Applicable to:
RUDDER ACTUATION
The rudder is actuated by 3 independent hydraulic jacks operating in parallel.
Applicable to: ,
RUDDER ACTUATION
The rudder is actuated by 3 independent hydraulic jacks operating in parallel.
‐ In normal operation, the 3 jacks are simultaneously in active mode.
‐ In case of an electrical or hydraulic failure, the corresponding jack is in damping mode.
Applicable to:
YAW DAMPING, TURN COORDINATION
The three hydraulic servojacks are actuated by a green hydraulic servo-actuator. A yellow
servo-actuator remains synchronized and will take over in case of failure.
There is no feedback to the rudder pedals from the yaw damping and turn coordination functions.
In case of a total loss of electrical power, or total loss of flight control computers, the Backup Yaw
Damper Unit (BYDU) becomes active for the yaw damping function only.
The BYDU consists of an electro-mechanical actuator, in parallel with the two normal yaw
dampers, and incorporates one gyrometer and associated electronics. Independent electric supply
is provided by two dedicated electrical generators, one is driven by the blue hydraulic system, the
other by the yellow hydraulic system.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A330/A340 FLEET DSC-27-10-20 P 18/22
FCOM 19 AUG 10
Applicable to:
RUDDER AND PEDAL TRAVEL LIMIT
Rudder and pedal deflection is limited as a function of the speed.
Each limiter channel is controlled and monitored by its associated SEC.
In case of a double SEC failure, the max rudder deflection remains at the value reached before the
failure ; then, a max deflection is available when the slats are extended.
Applicable to:
The rudder deflection is limited as a function of the speed.
In case of a three ADR or three PRIM failure, the maximum rudder deflection remains at the value
reached before the failure. Then, maximum deflection is available when the slats are extended.
Note: Depending on the Mach, this Max rudder deflection value may decrease slightly (less than
1 °).
Applicable to: ,
The rudder deflection is limited as a function of the speed.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A330/A340 FLEET DSC-27-10-20 P 19/22
FCOM 19 AUG 10
In case of a three ADR or three PRIM failure, the maximum rudder deflection remains at the value
reached before the failure. Then, maximum deflection is available when the slats are extended.
Note: Depending on the Mach, this Max rudder deflection value may decrease slightly (less than
1 °).
Applicable to:
RUDDER TRIM
Inside the PFTU, artificial feel and rudder trim are achieved by two electric motors which position
the artificial feel unit. In normal operation SEC 1 / MOTOR 1 are driving with SEC 2 / MOTOR 2
remaining synchronized as a backup.
In manual flight, the pilot can apply rudder trim from the RUD TRIM rotary switch located on the
pedestal.
Authority : 85 % of max ‐ rudder deflection (limited to 25 °).
‐ Rudder trim speed :
‐ In clean configuration :1 °/s
‐ with flats/slaps extended :
• For input up to 1.5 s : 1 °/s.
• After 1.5 s : 3 °/s.
A button is provided on the RUD TRIM panel to reset the rudder trim to zero.
Note: With the autopilot engaged, rudder trim orders are computed by FMGC. Rudder trim
rotary switch is not active.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FLIGHT CONTROLS
GENERAL - ARCHITECTURE
A330/A340 FLEET DSC-27-10-20 P 20/22
FCOM 19 AUG 10
Applicable to: ,
RUDDER TRIM
Inside the PFTU, artificial feel and rudder trim are achieved by two electric motors which position
the artificial feel unit. In normal operation SEC 1 / MOTOR 1 are driving with SEC 2 / MOTOR 2
remaining synchronized as a backup.
In manual flight, the pilot can apply rudder trim from the RUD TRIM rotary switch located, on the
pedestal.
‐ Authority : 85 % of max rudder deflection (limited to 29.7 °).
‐ Rudder trim speed :
‐ In clean configuration : 1 °/s
‐ With flats/slaps extended :
• For input up to 1.5 s : 1 °/s
• After 1.5 s : 3 °/s.
A button is provided on the RUD TRIM panel to reset the rudder trim to zero.
Note: With the autopilot engaged, rudder trim orders are computed by PRIM and transmitted to
the SEC for actuation. Rudder trim rotary switch is not active.
　
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