1EFF : 401-499, 1 32-42-00Page 3 1 1 Config-2 Aug 01/05 1 1 1CES 1
3. System Description__________________
A. General
The normal braking system is electrically controlled and hydraulically operated. The system has:
-a manual mode of operation, (the necessary rate of decrease in speed set at the brake pedals)
-an automatic mode of operation, (the necessary rate of decrease in speed set at the AUTO/BRK control panel).
Each of the two modes of operation gives automatic anti-skid protection at each wheel when the aircraft moves at more than ten metres a second.
The system includes electrical components that control hydraulic components. The hydraulic components control the quantity of hydraulic pressure that goes to the brakes.
B. Electrical System Components
The electrical control system has two independent sub-systems that are isolated from each other. The two sub-systems connect to these components in the brake system:
-an anti-skid (A/SKID & N/W STRG) switch
-three autobrake pushbutton switches (LO, MED and MAX)
-
a normal brake pedal transmitter unit mechanically connected to the brake pedals
-
a control channel of the BSCU
-
a tachometer on each axle.
The A/SKID & N/W STRG switch has two positions, in the ON position it sets the BSCU to make the normal braking system available. In the OFF position, normal braking is not available . In this condition the Alternate Brake Control Unit (ABCU) gives the control to the Alternate Braking without anti-skid (Ref. 32-44-00).
When an autobrake mode (LO, MED or MAX) is selected, the BSCU sends a controlled pressure to the brakes until the deceleration measured by the IRU(s) matches the programmed deceleration. Before takeoff, the pilot select the MAX mode. The brake pedals apply the related brakes of the left or right MLG. The brake pedals are installed in pairs and are mechanically connected together. The two left pedals are connected together and the two right pedals are connected together. Each pedal is connected to a spring operated unit that:
-supplies an artificial feel when the brake pedals are operated.
1EFF : 401-499, 1 32-42-00Page 4 1 1 Config-2 Aug 01/05 1 1 1CES 1 -puts the pedals back to their initial position when released.
The brake pedals operate the brake pedal transmitter unit which is installed below the pedals at the first officers position. The transmitter unit contains two potentiometers each with four tracks. One potentiometer is for the left MLG.The other potentiometer is for the right MLG. The BSCU sends an electrical supply to the potentiometers. When a brake pedal is operated, the related potentiometer sends an output to the BSCU. This output is in proportion to the angle through which the brake pedal moves.
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