I had a CO problem about a year ago and carried out some investigation.
The big clue, found by using a CO meter, was that the CO doubled when
the flaps were down. I talked to Andy Draper who said the exhaust gases
could enter via the flap slots and travel forwards through the tunnel
and into the cockpit via the various control slots. I resisted cleaning
my aircraft for a period and traced exhaust stains along the fuselage
that travelled to the (Trigear) leg/fuse join and up to the flap slot.
There were no stains aft of the flap slots. I considered putting a
leather boot around the pitch tube to seal off the tunnel and also
designing various devices to close off or deflect air away from the flap
slots but eventually gave up and the CO has mysteriously dropped.
In Bill=99s case it could be that the modification he has that
extracts air from the cockpit via a tube running from the baggage bay
bulkhead to the rudder sternpost might be increasing the negative
pressure in the cockpit and sucking in more CO. This theory could be
tested by disconnecting the tube, blocking up the hole in the rear
bulkhead and allowing the extraction tube to collect air from around the
flap slots and dump it overboard via the rudder sternpost hole.
Worth a try Bill?
Regards
Brian
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of
davidjoyce@doctors.org.uk
Sent: 14 September 2017 18:00
Subject: Re: Europa-List: Re: VENTILATION IN FLIGHT & POSITIVE CABIN
PRESSURE
Bill, Have you thought of getting yourself a domestic carbon monoxide
monitor which comes with a readout of CO concentration + indication of
how serious/lethal that concentration is. Sell for around =C2=A330 in
UK. After being exposed to near lethal levels when a plane I was test
flying shed its exhaust stub, I feel every plane should have one! But
it also let memove it around in my plane and find put where the fumes
were coming from which for me was from the slots in the exhaust stub
where it is clamped onto the silencer - fixed with fire cement.
Regards, David Joyce, GXSDJ
On 2017-09-14 16:48, willydewey wrote:
Thanks Guys for your inputs regarding ventilation. Food for thought
indeed.
i will mull over your replies but I favour(favor) high level vents
placed well up from the exhaust outlet. Not sure which ones yet.
Pete Jeffers has suggested that fumes may be getting in through the vent
pipe that was put in from the baggage wall to somewhere near the tail
Another invesigation I Guess.
Thanks all for your help and interest
Bill Dewey
--------
Give a wise man knowledge and he will be yet wiser
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