PPRuNe Forums - B777 Why is so quiet while turning R demand pump on?

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sm165019117

10th Oct 2023 11:00

B777 Why is so quiet while turning R demand pump on?

i found when we need to pressurize the hydraulic system before pushback, after turning on the R demand pump to auto, there will be quiet in cockpit for a while ( sounds like fans stop working), i am confused...
any logic within the demand pump, fans and noise in that situation. thanks a lot!!!!

applecrumble

10th Oct 2023 17:57

Quote:

Originally Posted by sm165019117 (Post 11517951)

ELMS load shedding while the demand pump comes up to speed.

sm165019117

13th Oct 2023 06:22

Quote:

Originally Posted by applecrumble (Post 11518134)

ELMS load shedding while the demand pump comes up to speed.

Thanks a lot, you are right. I checked the electric synoptic during turning the R demand pump to auto, there was a load shed showed. it seems that galley doesn't work or stop working at that moment.

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