Bob,
Although Europa recommend the Trim power supply comes directly off the battery
their circuit diagram clearly shows an isolating switch in the circuit.
Personally
I would regard this as a mandatory requirement to cover the trim runaway
situation. It can be provided by a pull to break circuit breaker, again as
stated
in the build manual.
Regards
Brian
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Bob Harrison
Sent: 09 April 2019 12:34
Subject: RE: Europa-List: Anyone experienced trim runaway?
Hi! Kingsley.
Fine to add a switch if it isolated the trim circuit except the original Europa
electrical circuit stipulation was for it to be wired direct to power supply
and by pass the isolating switch for the remaining circuit.
My experience involved the Ray Allen relay decks and it was them who discovered
the fault in the original relay deck, so resulting in the update to the Mark
II type
The loads developed on the control with maximum trim position is phenomenal and
would be impossible to land the aircraft with one control stick . the resulting
loads on the controls linkages are frightening .
Regards
Bob Harrison G-PTAG
Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Kingsley Hurst
Sent: 09 April 2019 10:52
Subject: Re: Europa-List: Anyone experienced trim runaway?
A few years ago, just after take-off from an airport a long way from
home, I experienced a trim runaway as I was trimming forward. I can
assure you it quickly got my attention as the control force was
uncomfortably heavy. After toggling the trim switch quickly in both
directions, normal trim function thankfully resumed.
The aircraft has trim switches on both sticks and has a relay in the
circuit. It was the relay that stuck and after replacing it with the
later heavier duty relay supplied by Ray Allen, no further problems were
experienced.
This incident dictated I put a trim on/off switch next to the trim
indicator on the panel.
Cheers
Kingsley in Oz
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