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Alternate Braking without Anti Skid - Schematic
Figure 001
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Brake Yellow Pressure Triple Indicator - Component Location
Figure 002
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Brake Yellow Pressure Transducer - Component Location
Figure 003
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Brake Yellow Pressure Accumulator - Component Location
Figure 004
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Brake Yellow Manifold / Relief Valve - Component Location
Figure 005
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Accumulator
Figure 006
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Brake Accumulator Installation
Figure 007
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Brake Yellow-Pressure Relief-Valve - Functional Diagram
Figure 008
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B. Pressure Relief and Check Valves Two pressure relief valves, included in the Alternate-brake servovalve manifold, connect the supply to the manifold return. This connection enables the brakes to be drained in any position of the servovalve slide valve.
4. Operation/Control and Indicating
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A. Operation The Alternate brake system without anti skid (ALTN/OFF braking) is controlled, as for Alternate braking with anti skid (ALTN/ON), through the pedals. Artificial feel characteristics (load on pedals/pedal angle) are identical. When the accumulator only supplies the brakes, the maximum pressure supplied to the brakes is approximately 10 bars (145 psi) higher than in ALTN/ON mode. The leakage which moves lightly the balanced position of the distribution dual valve no longer changes this pressure at the Alternate brake servovalves. You can get seven full applications of the brakes if:
-
you shut off the return lines of the brake servovalves,
-
you partially drain the brakes when the pedal is released. When the pedals are pushed, the pressure increases at the brakes through the Alternate brake servovalves. The servovalves can operate under brake regulation as long as the internal leakage specific to the servovalves does not pressurize the return. When the pedals are released, pressure relief valves permit draining of the brakes in any position of the servovalve.
1EFF : 001-049, 051-099, 101-149, 151-199, 1 32-44-00Page 12 1201-299, 301-399, 1Config-1 Aug 01/05 1 1 1CES 1 ALTERNATE BRAKING WITHOUT ANTI SKID - DESCRIPTION AND OPERATION
_______________________________________________________________
1. General_______
(Ref. Fig. 001)
The Alternate Braking without Anti Skid System is the secondary mode of operation of the Alternate Braking with Anti Skid System (Ref. 32-43-00). The system uses the same electrohydraulic components as the Alternate Braking with the Anti Skid System with some additional special components.
The WHEEL page on the system display will show:
-when the system is available
-the hydraulic supply available
Braking inputs come from the Alternate Brake Pedal Transmitter Unit 103GG, located under Captain's pedals. When the brake pedals are operated, hydraulic pressure from the accumulator gives sufficient pressure for a minimum of seven full operations of the brakes. Pressure at the brakes is limited to a maximum pressure of 70 bar (1000 psi).
Braking is only possible via the alternate BPTU 103GG. When the brake pedals are operated, hydraulic pressure is supplied from the Yellow main hydraulic system (Ref. 29-13-00). If the Yellow system is not available, the pressure is supplied from the accumulator (filled from the Yellow system). The pressure is limited to 70 bar (1000 psi) and has sufficient pressure for a minimum of seven full operations of the brake pedals.
A triple pressure indicator 60GG in the cockpit shows:
-
the accumulator system pressure available (top gage)
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