"B" system again contains a single reservoir supplying two electric AC pumps. It's reservoir is more complicated that system "A" in that it has an auxiliary reservoir separated by a baffle which is open at the top ("little b"), this is reserved for alternate extension of the leading edge slats and flaps using stand by hydraulic power (more about that later).
Each pump is controlled by it's individual selection switch, with the switch ON normal hydraulic output pressure is provided to the system. As in the "A" system a portion of the fluid is used for cooling and lubrication of the pump but is returned via a heat exchanger in the no1 fuel tank. if the pressure falls below the preset level a warning light will illuminate, sensors monitor the fluid temperature and if activated will bring on an overheat light. A relay in the overheat sensing circuit will cause the overheat light to go out when the affected pump is turned off. A simplified view of the system is the same as the above diagram but with no blocking valve or shut off valve (items 2 & 4).
Fluid Quantity....................Full if system "A" quantity over 2.5 gall
System Pressure............2,800 - 3100 p.s.i (red line @ 3,500)
Baffle level (little B)............1.1 gall
Do not operate a system "B" pump with less than 1,300 lbs in fuel tank No1
Any one hydraulic system "B" pump should not be operated more than 5 times in 5 min's. After this period the pump must be left on for 5 min's or off for 30 min's.
"B" system again contains a single reservoir supplying two electric AC pumps. It's reservoir is more complicated that system "A" in that it has an auxiliary reservoir separated by a baffle which is open at the top ("little b"), this is reserved for alternate extension of the leading edge slats and flaps using stand by hydraulic power (more about that later).
Each pump is controlled by it's individual selection switch, with the switch ON normal hydraulic output pressure is provided to the system. As in the "A" system a portion of the fluid is used for cooling and lubrication of the pump but is returned via a heat exchanger in the no1 fuel tank. if the pressure falls below the preset level a warning light will illuminate, sensors monitor the fluid temperature and if activated will bring on an overheat light. A relay in the overheat sensing circuit will cause the overheat light to go out when the affected pump is turned off. A simplified view of the system is the same as the above diagram but with no blocking valve or shut off valve (items 2 & 4).
Fluid Quantity....................Full if system "A" quantity over 2.5 gall
System Pressure............2,800 - 3100 p.s.i (red line @ 3,500)
Baffle level (little B)............1.1 gall
Do not operate a system "B" pump with less than 1,300 lbs in fuel tank No1
Any one hydraulic system "B" pump should not be operated more than 5 times in 5 min's. After this period the pump must be left on for 5 min's or off for 30 min's.
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