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19 Cards in this Set
- Front
- Back
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Nominal hydraulic system pressure is
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3000psi
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The accumulator in each hydraulic system function as
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Pump pulsation dampers (precharged to 1500lbs)
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Skydrol-B type hydraulic fluid is used in all hydraulic systems which is
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Has fire retardant properties
Is highly corrosive Is purple in color |
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The B hydraulic pumps normally operate
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When the flaps are extended
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pushing an ENG FIRE PUSH switchlight closes the hydraulic valve in the related
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Engine driven A pump suction line
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The No. 1 hydraulic system components are located in
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Left side of the equipment bay
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Pumps 1B and 2B are electrically supplied from
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The offside main AC bus
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When the 3B switch is selected to AUTO, the pump operates
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If the flaps are extended and either IDG generator is offline
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Fluid quantity limits are shown on the HYDRAULIC synoptic page by
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Color coding of the numerical quantity readout within each reservoir (green-okay; white-too high or low)
Green lines shown vertically on each side of the reservoir symbols |
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The 3A hydraulic motor/pump assembly is located in the
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Left side fuselage at the wing trailing edge
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the priority valve in the No. 3 hydraulic system output manifold ensures
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Adequate hydraulic pressure to the primary flight control PCUs
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In normal operation with flaps extended, the system pressure readouts shown on the HYDRAULIC synoptic page indicate
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The higher pressure produced between the A and B pumps
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Failure of the hydraulic shutoff valve to close after the related ENG FIRE PUSH swithch is pused is indicated by
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The related amber HYD SOV caution EICAS message
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The amber HYD1 LO PRESS caution EICAS message indicates
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Pumps 1A and 1B are not producing sufficient pressure (system pressure is low)
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What alerting is activated if pump 1B produces 1900psi output
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No alerting is activated
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Filter clogging and subsequent fluid bypassing is indicated by
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A red pin protruding from flush position on the related filter housing
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If the 1B and 2B swithces are selected to ON while airborne, the 1B and 2B pumps
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Are individually controlled to run only if the opposite generator is online
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To ensure the 3B pump operates automatically after ADG deployment (no main AC Buses)
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There are no cockpit controls that influence 3B pump operation, and the 3B swithch has no effect on pump operation when the ADG is deployed
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If the APU or the IDG genterator(s) are recovered after ADG deployment, the 3B pump
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May be transferred back to AC bus 1 by pushing the PWR TXFR OVERRIDE switch on the ADG panel
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