C21;
Is there a reason why the transfer pump switches don't have a third option in addition to "on" and "off" i.e. "automatic"?
Very good point.
A while ago I asked our engineer (you know who you are!) to confirm that when the warning came on, it indicated that the pump was either 'running dry' or u/s, as opposed to warning the pilot that it had turned itself off. It wasn't the latter.
It seemed to make sense that as the drill is to turn the pump off when the caption comes on, why wouldn't/doesn't it do it automatically.
As I'm aware, the
F PUMP warnings will come on in only 3 circumstances;
If its
running dry, it gets turned off.
If it's
unserviceable, its not working.
If the
cb has gone, should you be resetting it in 'normal flight'?
If its a case of the first instant, when the pump becomes wet again it would switch itself back on and alleviate any of the problems associated with either not switching it back on, or switching the prime pumps on by mistook.