Hello Will,
You could connect the second fuel pump direct to the battery, via a
fuse/CB and switch as for the trim circuit, but why would you wish to?
In the event of alternator failure, unless you have a low-capacity main
battery, you have plenty of time to shed loads according to how long you
need to keep airborne. In the event of a forced landing and turning off
the main bus with the master switch, the electric trim is kept
operational to avoid heavy stick forces, but this logic does not apply
to the fuel pump.
If the engine has stopped and you are making a forced landing, a single
action to turn off the master switch before contact with the ground will
kill all electrics (except the trim and your built-in standby batteries)
and minimise the risk of a post-impact fire caused by an electrical
short circuit and hefty current from the main battery. In particular,
it will also stop the fuel pumps from potentially squirting fuel all
over the wreckage, without your having to remember to switch off your
fuel pump off separately.
Of course, you would never shut down the engine after parking, turn off
the master switch and forget to turn off your fuel pump!
Best wishes,
Mike
Dr Mike Gregory
Europa Club safety officer
01480 451655
07885 355765
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of William
Daniell
Sent: 05 April 2018 17:25
Subject: Europa-List: Rotax 914 Electric fuel pumps
I have the Europa System with one of the pumps connected direct to the
alternator and the other to the bus.
I get the logic of a direct connection to the alternator.
Why isn't the other pump connected direct to the battery so that if the
alternator fails you can switch off the buss run one pump off the
battery?
(My EFIS has a back up battery and I carry a hand held so I can operate
with the buss off.)
thanks
Will
William Daniell
LONGPORT
+57 310 295 0744
|