It would take several minutes to flush 'main' side fuel out of the
system before being able to verify the reserve side is indeed good, with
the coolant heating up in the meantime due to poor ground cooling
(especially at run-up power). The fuel flow would be lower than in
flight, and the deck angle different, making the test less consistent
with flight conditions. Running the engine for 10-20 minutes in flight
might also tend to bring more contaminants or water (if any) into the
filter or gascolator than a short run during run-up.
Regards,
Terry
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Duncan
McFadyean
Subject: Re: Europa-List: fuel sender location
--> <ami@mcfadyean.freeserve.co.uk>
Good plan, but why not do it during a ground run-up?
Duncan McF.
----- Original Message -----
From: "Terry Seaver (terrys)" <terrys@cisco.com>
Subject: RE: Europa-List: fuel sender location
> <terrys@cisco.com>
>
> Hi,
>
> We try to regularly switch to the reserve side for several minutes in
> order to verify that the reserve still 'works'. We do this of course
at
> altitude in a safe part of the flight, in case the reserve IS plugged
up
> and we need to switch back immediately. I strongly recommend this
> practice regardless of which side is thought more likely to get
> contaminated, remembering, of course, to switch back to the main side
> before the fuel level reaches the 'hump'.
>
> Regards,
> Terry Seaver
> A135 / N135TD
>
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