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system is used to pressurize the outboard brakes. If the toe brakes are released and then the PARK/EMER BRAKE is released,
the trapped hydraulic fluid will return to the left hydraulic system.
The accumulator in the left hydraulic system allows extended parking, or at least six emergency brake
pressure applications. Accumulator pressure information is provided to the flight crew by a pressure transducer.
The EICAS indicates normal parking brake engagement or any fault detected in the form of a visual/or aural message.
BRAKE BRAKE
PARK/EMER PARK/EMER
CFO1501002_019
STOWED
SET
REV 1
LANDING GEAR
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 15-01-13
TIRES AND BRAKES (Cont)
BRAKE CONTROL SYSTEM
CFO1501002_033
PILOT
PEDAL
TRANSDUCER
PEDAL
TRANSDUCER
COPILOT
EICAS/MDC
BRAKE
CONTROL
CARD
(OUTBOARD)
BRAKE
CONTROL
CARD
(INBOARD)
BRAKE
CONTROL
UNIT
PRESSURE
LEFT
HYDRAULIC
SYSTEM
RETURN
LEFT
HYDRAULIC
SYSTEM
WHEEL SPEED
TRANSDUCER
PRESSURE
SWITCH
BRAKE
ACCUMULATOR
PRESSURE
RIGHT
HYDRAULIC
SYSTEM
RETURN
RIGHT
HYDRAULIC
SYSTEM
SHUTOFF
VALVE
CHECK
VALVE
PRESSURE
TRANSDUCER
BRAKE
SHUTTLE
VALVE
BRAKE
HYDRAULIC
FUSE
BRAKE
CONTROL
VALVE
1 4 2 3
1 2 3 4
EMERGENCY
PARKING BRAKE
VALVE (REF)
REMOTE GUAGE
AND CHARGING
VALVE
HYDRAULIC SYSTEM
AND BRAKE PRESSURE
HYDRAULIC RETURN
ELECTRICAL
LEGEND
REV 1
LANDING GEAR
Volume 2 Flight Crew Operating Manual Sep 13/2004
15-01-14 CSP 100-6 REV 1
TIRES AND BRAKES (Cont)
MAIN AND PARK/EMER BRAKE ACCUMULATORS
The main and park/emergency brake accumulators are located on the aft side of the underwing fairing support frame. The
parking/emergency brake accumulator is connected to a gauge and charge valve that is located in the rear fuselage battery
compartment.
CFO1501002_029
BRAKE
ACCUMULATOR
A
A
PARK/EMERGENCY
BRAKE
ACCUMULATOR
LANDING GEAR
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 15-01-15
TIRES AND BRAKES (Cont)
ANTI-SKID
DESCRIPTION
The anti-skid function controls brake pressure to prevent skids.The brake control unit provides antiskid protection down to
10 kts to each of the main wheels. Rotation speed of each wheel and its rate of deceleration are sensed by the wheel speed
transducers and this data is transmitted to the brake control unit. The brake control unit modulates the hydraulic pressure
at the brake to prevent wheel lockup.
The system prevents lockup by comparing the speed of each wheel installed on the same landing gear assembly. It also
compares the speed between each wheel of the same brake system, outboard or inboard. For example, if the right inboard
wheel rotates at a significantly slower speed than the left inboard, the brake control unit releases the brake on the slower
turning wheel. When both paired wheels return to the same speed, the brake control unit reapplies brake pressure.
NOSEWHEEL STEERING
DESCRIPTION
The nosewheel steering is designed to provide safe and reliable directional control of the aircraft during all phases of taxi, takeoff and
landing. The nosewheel steering provides electrically controlled and hydraulically powered actuation of the nose landing
gear steering actuator mounted on the nose gear assembly. When the nosewheel steering is not armed, or under failure conditions,
the system continues to provide effective damping to ensure dynamic stability of the nose landing gear.
The Nosewheel Steering System (NWS) is armed by selecting the NWS switch on. The NWS switch is located on the
LANDING GEAR control panel and is illuminated when it is in the OFF position. Steering commands are input to the steering
control unit (SCU) through the pilot handwheel (full authority, ±65° at the nose wheel) and/or through the rudder pedals
(limited authority, ±7° at the nose wheel). Position feedback is provided to the SCU from a position transducer on the NLG.
There is no mechanical connection between the flight deck controls and the steering actuators. Nosewheel steering commands
are transmitted electronically using “steer-by-wire” technology.
COMPONENTS AND OPERATION
STEERING CONTROL UNIT
The steering control unit (SCU) controls the electro-hydraulic steering valve to port hydraulic fluid to either end of the
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