4. Power Supply
____________
A. Electrical Power Supply
(Ref. Fig. 002)
B. Hydraulic Power Supply The hydraulic pressure is supplied from the Green Main Hydraulic Power system (Ref. 29-11-00).
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INTENTIONALLY BLANK
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Normal Braking- Power Supplies Schematic Figure 002 (SHEET 1)
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Normal Braking- Power Supplies Schematic Figure 002 (SHEET 2)
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Normal Braking System _ Interface
Figure 003
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6. Component Description_____________________
A. Brake Pedal Assembly
(Ref. Fig. 004)
There are two brake pedal assemblies (one at the captains position and one at the first officers position) with two pedals in each assembly. They transmit the manual braking inputs through a brake pedal transmitter unit (located at the first officers pedals) to the BSCU. They also transmit the manual braking inputs through a brake pedal transmitter unit (located at the captains pedals) to the ABCU (Ref. 32-43-00-00).
Each pedal in each assembly is installed at one side of a vertical column and they are free to turn independently. Levers and rods connect the left pedals of each assembly to each other. Levers and rods connect the right pedals of each assembly to each other. The pedals in each assembly are also connected to:
-a spring operated actuator (spring rods)
-the input shaft of their related transmitter units.
The spring rods:
-gives a resistance (artificial feel) when a force is put on the related pedal
-put the pedal back to its initial position when the force is removed.
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Brake Pedal Assembly
Figure 004
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B. Brake Pedal Transmitter Unit (9GG)
(Ref. Fig. 005, 006)
The transmitter unit is an electro-mechanical device connected to the brake pedals at the first officers position. It changes an electrical input (that the BSCU supplies) to give an electrical output in proportion to the movement of the brake pedals. The unit has two mechanical assemblies (left and right) and a case with two electrical connectors.
The mechanical assemblies each include an end plate attached to the casing. The end plate contains a number of ball bearings and a bush in which a shaft turns. A lever is attached to the outer end of the shaft. A pin and a drive plate at the other end of the shaft engage a potentiometer drive shaft. A stop installed in the end plate prevents angular movement of the shaft more than a specified value.
The case contains two potentiometers that are attached to their related end plate. Each potentiometer has four electrical tracks. One potentiometer gets the mechanical movement from the left lever, the other potentiometer gets the mechanical movement from the right lever. A cable assembly connects the tracks of each potentiometer to the electrical connectors.
When a lever turns the shaft of the related potentiometer, it gives four electrical output voltages that are the same. The voltage is in proportion to the angle through which the lever turns.
Two outputs go through each connector to the BSCU. Two go to system 1, the others go to system 2.
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Brake Pedal Transmitter Unit
Figure 005
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Brake Pedal Transmitter Unit _ Characteristics
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