-
the pressure given at the brakes of the LH and RH MLG (bottom two gages).
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Alternate Braking without Anti Skid - Schematic
Figure 001
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2. Component Location
__________________
(Ref. Fig. 002)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------
60GG IND-BRK YELLOW PRESS TRIPLE 4VU 211 831 32-44-21 100GG PRESS XDCR-BRK, YELLOW R 671 32-44-19 101GG PRESS XDCR-BRK, YELLOW L 571 32-44-19 2582GM ACCU-BRK YELLOW PRESS 148 744 32-44-11 2585GM PRESS GAGE-BRK,YELLOW ACCU 148 744 32-44-14 2586GM CHARGING VALVE-BRK,YELLOW ACCU 148 744 32-44-13
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Component Location
Figure 002
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3. System Description__________________
(Ref. Fig. 001)
The system uses the same hydraulic and electrohydraulic components as specified in the Alternate Braking with Anti Skid system (Ref. 32-43-00).
The Alternate HP Manifold Assembly 3016GM connects the hydraulic supply (from the Yellow system or the accumulator) to the downstream components. This manifold has a check valve and a pressure relief valve. The check valve prevents the flow of fluid from the accumulator to the Yellow supply line. The pressure relief valve releases any system pressure of more than a given limit. This valve also includes a manual depressurization buttom which will release all the system pressure during system maintenance.
A pressure transducer 3068GN attached to the manifold measures the system pressure available. It transmits this data to the triple pressure indicator 60GG(in the cockpit) and the ABCU.
The alternate brake selector valve 99GG controls the supply of the available hydraulic pressure to the two Alternate Braking Manifolds.
The alternate brake manifolds have a pressure transducer.It measures the pressure supplied to the brakes (downstream of the safety valves) and transmits this data to the triple pressure indicator, the ABCU and the BSCU.
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4. Power Supply____________ (Ref. Fig. 003)
5. Interface_________ (Ref. Fig. 004)
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Power Supplies - Schematic
Figure 003
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System Interface
Figure 004
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6. Component Description_____________________
A. Triple Pressure Indicator 60GG
(Ref. Fig. 005)
The triple pressure indicator has three dials on its front face. The top gage shows the system hydraulic pressure available (Yellow hydraulic system or accumulator) the bottom two gages show the hydraulic pressures:
-
that go to the left MLG brakes
-
that go to the right MLG brakes.
The indicator is enclosed in an octagonal case and has an electrical connection at the rear. Each pressure indication is operated with a galvanometer. A printed circuit board gives a stabilized power supply and permits adjustment of the galvonometers.
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Triple Pressure Indicator 60GG
Figure 005
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B. Brake Yellow Pressure Accumulator 2582GM
(Ref. Fig. 006)
The accumulator is an oleo-pneumatic unit that keeps a specified volume of pressurized hydraulic fluid in it.
It has a steel body which contains a flexible bladder. An inlet connector permits the bladder to be pressurized with nitrogen. A nozzle assembly, which includes a spring and a poppet valve, lets pressurized hydraulic fluid go into the body. The bladder keeps the nitrogen and hydraulic fluid apart.
When the fluid chamber is not pressurized, the nitrogen pressure expands the bladder until it touches the poppet valve. The poppet valve closes to keep the bladder in the body. When the fluid chamber is pressurized, the bladder size decreases until the pressures in the gas and fluid chambers are equal. The spring keeps the poppet valve open. As the pressure at the fluid inlet decreases, the bladder expands and forces the hydraulic fluid from the fluid chamber.
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