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DESCRIPTION
Applicable to: ALL
Nosewheel steering is provided by two actuators, powered by the green hydraulic system, and
electrically-signalled by the Brake and Steering Control Unit (BSCU).
The BSCU has two independent systems. Only one is active at a time, while the other is on standby.
To control the steering, the BSCU receives inputs from the steering handwheels, the rudder pedals
and the autopilot.
The BSCU transforms the pilot's order into a nosewheel steering angle, by controlling the servovalve
to provide the requested flow for the hydraulic actuators. The following limitations apply :
The steering handwheels control the nosewheel steering angle up to ± 72 ° in either direction. A
lever on the towing electrical box (on the nose L/G) enables the steering system to be deactivated for
towing purpose.
A visual red warning on the overhead panel indicates to the crew that an oversteer (± 93 °) has
occurred.
Pilots can disconnect the rudder pedal order to the BSCU, via a pushbutton located on each steering
handwheel.
An internal cam mechanism returns the nosewheel to the centered position after takeoff.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - DESCRIPTION
A330/A340 FLEET DSC-32-20-10 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-32-20-20 P 1/4
FCOM 19 AUG 10
RUDDER PEDALS
Applicable to: ALL
Nosewheel steering control authority depends on aircraft speed. Rudder pedals provide nosewheel
steering control :
‐ Below 100 kt at landing
‐ Up to 150 kt for takeoff
Note: The nosewheel steering angle depends on aircraft speed, and will return to zero if the
aircraft is above these speeds.
SIDE CONSOLES
Applicable to: ALL
(1) STEERING HAND WHEELS
The steering handwheels control the nosewheel steering angle control below 100 kt, and up to
72 ° left or right.
(2) RUDDER PEDAL DISC pb
When maintained pressed, nosewheel steering is disconnected from the rudder pedals.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-32-20-20 P 2/4
FCOM 19 AUG 10
CENTER INSTRUMENT PANEL
Applicable to: ALL
(1) A/SKID and N/W STRG sw
An ON/OFF switch activates or deactivates the Nose Wheel Steering and Anti-Skid (Refer to
DSC-32-30-10 GENERAL).
OVERHEAD PANEL
Applicable to: ,
NWS TOWING pb (guarded)
FAULT : On ground, it comes on red when the nosewheel steering has exceeded 93 °. It is
associated with the illumination of the red oversteer warning light, located on the nose landing gear.
When pressed, the light goes out.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-32-20-20 P 3/4
FCOM 19 AUG 10
ECAM WHEEL PAGE
Applicable to:
(1) N/W STRG indication
Appears amber in case of :
nose wheel steering failure detected by the ‐ BSCU (associated with an ECAM caution)
‐ A/SKID & N/W STRG switch is at OFF
‐ failure of both BSCU channels (associated with ECAM caution).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-32-20-20 P 4/4
FCOM 19 AUG 10
ECAM WHEEL PAGE
Applicable to: ,
(1) N/W STRG indication
Appears amber in case of :
nose wheel steering failure detected ‐ by the BSCU (associated with an ECAM caution)
‐ A/SKID & N/W STRG switch is at OFF
‐ failure of both BSCU channels (associated with ECAM caution).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
NOSE WHEEL STEERING - WARNINGS AND CAUTIONS
A330/A340 FLEET DSC-32-20-30 P 1/2
FCOM 19 AUG 10
WARNINGS AND CAUTIONS
Applicable to:
E/WD : FAILURE TITLE
conditions
AURAL
WARNING
MASTER
LIGHT
SD PAGE
CALLED
LOCAL
WARNING
FLT
PHASE
INHIB
N/WSTRG FAULT
detected by BSCU SINGLE CHIME MASTER CAUT WHEEL NIL 3, 4, 5, 8
WARNINGS AND CAUTIONS
Applicable to: ,
E/WD : FAILURE TITLE
conditions
AURAL
WARNING
MASTER
LIGHT
SD PAGE
CALLED
LOCAL
WARNING
FLT
PHASE
INHIB
N/WSTRG FAULT
detected by BSCU SINGLE CHIME MASTER CAUT WHEEL NIL 3, 4, 5, 8
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 3(99)
