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30 Cards in this Set
- Front
- Back
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Hydraulic system A powers?
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-Autopilot A
-NWS -Landing Gear -Alternate Brakes -#1 T/R -PTU (for alternate auto slat operation) -Inboard flight spoilers -Ground Spoilers -Ailerons -Elevator and elevator feel system -Rudder |
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Hyd A Pumps?
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ENG 1, ELEC 2(gen bus 2)
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How is ENG 1 pump isolated from hydraulic system?
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Solenoid-held blocking valve that blocks pump outlet to using units (energized closed, fails open).
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Volume of ELEC 2 pump vs ENG 1 pump?
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1/3, same PSI.
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Sequence of A hydraulic fluid?
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Pumps, case drain lines, heat exchanger in No. 1 fuel tank, reservoir.
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Hyd Sys A heat exchanger locations?
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Electric Pump case drain lines and pump housing.
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Where are A hydraulic quantity indicators?
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System A reservoir in main wheel well, and on secondary engine instrument panel (FO's panel on non-EIS)
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A reservoir capacity?
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4.7 gallons
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What is Hyd A and B standpipe level?
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If leak develops in ENG pump or pump lines...about 25% for A and 50% for B.
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What happens if Electric Pump or it's lines develops a leak?
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Total loss of fluid, pump intake is at bottom of tank.
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PTU?
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Backup for autoslats in case Hyd B ENG 2 pump pressure drops below certain limits. Sys A fluid drives motor that pressurizes system B fluid supplied from bottom of B reservoir.
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Hydraulic system B powers?
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-Autopilot B
-Landing Gear Transfer Unit -Alternate NWS on some airplanes -Normal Brakes -Autobrakes -#2 T/R -LE Slats and Flaps -Autoslats -TEF's -Outboard Flight Spoilers -Ailerons -Elevator and elevator feel system -Rudder -Yaw Damper -Accumulator brakes (with pressure from an accumulator precharge) |
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Hyd B Reservoir capacity?
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7.2 gallons
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If stby reservoir is depleted, what quantity does Sys B Hyd show?
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64% (1/2 and RFL on non-EIS)
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System B two standpipes...taller supplies? Shorter supplies? What displays if a leak goes to these standpipes? What remains after a leak to the shorter pipe?
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Taller supplies standby reservoir. Displays 64%
Shorter supplies engine pump. Displays 50%. If leak in electric pump, displays 0 but 1 gallon remains for PTU alternate auto slats. |
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What systems go to standby when A or B Hydraulics systems are lost.
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-Rudder
-Leading edge flaps and slat (extension only) -No. 1 and No. 2 T/R |
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Describe standby hydraulic pump.
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One electric pump powered by generator bus 1, with a transfer to generator bus 2 if 1 is not powered. 1/2 volume output of A or B electric pump output.
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How can you activate standby system manually?
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-A or B FLT CONTROL switch to STBY RUD
-ALTERNATE FLAPS master switch to ARM |
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Automatic activation of standby system?
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All conditions met:
-Sys A or B hyd pressure is lost or rudder pressure reducer system fails in low pressure mode -TEF's extended -A/C in flight or on ground with WS>60 kts. Slowing or raising the flaps shuts pump off. -FLT CONTROL switch A or B is ON |
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Standby reservoir capacity?
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2.8 gallons
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How is standby system supplied and pressurized?
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Balance line connected to the top of the system B reservoir.
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How is standby hyd quantity monitored?
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Continuously armed STANDBY HYD LOW QUANTITY light on the overhead panel. Comes on at 50%.
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What normal operating conditions can cause hydraulic quantity indication variations?
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-system becomes pressurized from pneumatic system
-landing gear up/down -LEF/slats up and down -cold soaking after long time at cruise |
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What indicates foaming?
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Hyd system not properly pressurized, at higher altitudes...pressure fluctuations and blinking of LOW PRESSURE light(s).
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Which is more accurate quantity indicator on EIS airplanes?
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Wheel well, cockpit indicators may be in error 8%.
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Max brake pressure?
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3500 (norm is 3000, precharge is 1000)
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When is th STANDBY HYD LOW QUANTITY light armed?
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Standby pump is powered automaticaly or manually. Low output pressure from pump.
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When does the OVERHEAT light above the pump switch come on?
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Pump case drain fluid or pump itself gets hot.
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After servicing the hydraulic systems, what do you need to check?
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That cockpit indicators do not exceed 100% (prevents overservicing and venting of fluid into the wheel wells).
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What happens to the engine driven LOW PRESSURE light when the fire handle is pulled?
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It is disarmed.
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