Alessio75 3 Posted November 14, 2019 Share Posted November 14, 2019 Hi, during cockpit prep CL, the yellow circuit pump is set on with its characteristic sound. But when its button is asked to be turned off? Link to comment Share on other sites More sharing options...
SpottyMCapt 1 Posted November 5, 2020 Share Posted November 5, 2020 That is incorrect. The Yellow electric pb should be in auto. Link to comment Share on other sites More sharing options...
Alessio75 3 Posted November 8, 2020 Author Share Posted November 8, 2020 Hi thank you. I was referring to "elec pump" push button. It has only on and off position Link to comment Share on other sites More sharing options...
Deputy Sheriffs masterhawk 799 Posted November 8, 2020 Deputy Sheriffs Share Posted November 8, 2020 There is no need to use it. Only case might be single engine taxi depending on SOP. But that is not officially supported. The characteristic sound might be the PTU during engine start. Link to comment Share on other sites More sharing options...
Alessio75 3 Posted November 8, 2020 Author Share Posted November 8, 2020 Thanks for clarify. But my original question was that during preparation CL this button is pressed ON. I cannot find the moment in the checklists when it is turned off. Link to comment Share on other sites More sharing options...
SpottyMCapt 1 Posted November 10, 2020 Share Posted November 10, 2020 That is not in any checklist I am familiar with. You may hear the pump running when the cargo doors are open, indeed I once had a Yellow System overheat when the door selector stuck and the pump kept running. I had to pull a CB to get it to stop. This is from the checklist OVERHEAD PANEL * ALL WHITE LIGHTS...............................EXTINGUISH(1) * RCDR GND CTL pb-sw..............................................ON CVR TEST pb.............................................................PRESS CAPT & PURS/CAPT sw..............................................CAPT * ALL IR MODE selector.............................................NAV EXTERIOR LIGHTS........................................................SET * SIGNS.......................................................................SET PROB/WINDOW HEAT................................................AUTO LDG ELEV....................................................................AUTO * PACK FLOW...................................................ASRQRD ELEC panel................................................................CHECK BAT............................................................................CHECK ENG FIRE........................................................CHECK/TEST AUDIO SWITCH..........................................................NORM VENT panel...............................................................CHECK PA (3rd occupant)....................................................RECEPT MAINT panel..............................................................CHECK There is also this - The ACCU PRESS indication must be in the green band. If required, use the electric pump on yellow hydraulic system to recharge the brake accumulator. WARNING Yellow and green hydraulic systems are pressurized from yellow electric pump. Get ground crew clearance before using the electric pump. Link to comment Share on other sites More sharing options...
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