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zuxrat
20th Jun 2023, 10:07
Good afternoon!
There is one question in MRG that I can't solve.

Q36 What indication on the flight deck tells you that the door of the Fuelling Station is open?
Hint: No, don't look through the window. The answer is on the overhead panel.

Does anyone have any idea? I couldn't find anything.

Thanks!

Flying Wild
20th Jun 2023, 16:23
Good afternoon!
There is one question in MRG that I can't solve.

Q36 What indication on the flight deck tells you that the door of the Fuelling Station is open?
Hint: No, don't look through the window. The answer is on the overhead panel.

Does anyone have any idea? I couldn't find anything.

Thanks!

Battery Voltage.

When the panel is open it will read ~27 Vdc. When itís closed it will read ~31 Vdc

hans brinker
20th Jun 2023, 16:54
Battery Voltage.

When the panel is open it will read ~27 Vdc. When itís closed it will read ~31 Vdc

Not on the 737 myself, but curious. I am assuming this is with the aircraft on external power. Does this mean the battery gets isolated from external by opening the fuel panel? And if true, why?

FlyingStone
20th Jun 2023, 22:29
With the refueling panel open, the main battery charger isn't (trickle) charging the battery, so the voltage displayed is that of the battery (~28V), not the charger (~31V).

zuxrat
21st Jun 2023, 07:50
Thank you for reply. Have a nice day! :)