EDP used on V2500 and CF6

[Ericgkl]

I came across this msg "HYD DEMEN Pump 4". Could not figure out what it means. The pump seems to be working fine. Any idea what the msg means??

[fredgrav]

Hi Ericgkl,
the EICAS message should be this type HYD PRESS DEM 4, just means that demand pump output pressure is low ...

Safe Landings ;)
fredgrav

[Swedish Steve]

Which aircraft you guys talking about?
What has 4 systems and V2500?
and is an EDP and a Demand pump?

Confused of Stockholm

[MarkerInbound]

The 744 with CF6 engines has an AUX pump on the #4 (and maybe #1)system to provide pressure to the brakes. When you take the pump selector from AUTO to AUX, the demand pump is deactivated and you get the HYD PRESS DEM 4 message. Was normal during our pushbacks.