PPRuNe Forums - B748 demand pumps

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SRS	16th January 2025 06:55

B748 demand pumps

Not sure if the hydraulic demand pumps can operate the gear and flaps normally without the engine driven pumps.

Amadis of Gaul

16th January 2025 15:49

I'm not sure either.

Avinthenews

16th January 2025 16:59

Yes they can, it’s just slower.

You can have either the EDP or the DEM pump Inoperative as per the MEL.

boeing747430

21st January 2025 13:28

Since they are designed to take the full load after engine shutdown with a fire switch, it poses no problem at all. Neither in the 744. You can eve dispatch with the pump removed alltogether.

CV880

25th January 2025 00:42

Demand Pumps are used to do many maintenance functions including flap operation, gear retractions etc.

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