A320 Center Tank Pumps

[arrow28]

Hi All

Why does the A320 center tank pumps run for 5 mins after the center tank runs dry?

Thanks

[Goldenrivett]

Hi arrow28,

Technically the 5 mins timer doesn't start when the tank is "dry". It starts from when the CTR TK LO LVL sensor is triggered. (DSC-28-10-30 Engine Feed CENTER TANK PUMPS CONTROL LOGIC diagram.)
There is still a small amount of fuel in the centre tank which can normally be scavenged out in 5 mins.

[arrow28]

GR
Would you happen to know at what levels the LO LVL sensors are triggered.

[IFixPlanes]

Is this a question? :confused:

[Goldenrivett]

If that was a question, then this is an answer.

.... at what levels the LO LVL sensors are triggered.
About 100 kgs +/- 100 depending on attitude.

[arrow28]

GR
Thank you.

[FlightDetent]

IFixPlanes: Hi. Since you'd made your self known here :) could we have your comment on these "sequence valves" http://www.pprune.org/tech-log/593435-a320-pump-pressures-wing-center-tnk.html?highlight=center+tank#post9738523? Pretty please...

[IFixPlanes]

you are welcome...;)