PPRuNe Forums - EDP used on V2500 and CF6

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Ericgkl

24th March 2010 00:38

EDP used on V2500 and CF6

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

24th March 2010 09:15

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

24th March 2010 13:18

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

Confused of Stockholm

MarkerInbound

24th March 2010 17:52

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.

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