I flew a mono wheel demonstrator in the UK and immediately smelled exhaust
fumes. The pilot claimed not to smell anything.
M
>We now have about 25 hours on our mono-wheel XS.
>I am getting cabon monoxide levels of 60-100 ppm
>in flight. The firewall is tight. The CO seems to be
>coming in from behind the baggage bay.
>When in flight, air exits the cabin through the control
>slots in the tunnel, but enters the cabin from the
>tail area when the baggage bay / fuel pump access
>panel is lifted slightly.
>Our guess is that the CO is from the exhaust pipe,
>going under the port wing, then entering the port
>side flap drive slot. With the tail at higher pressure
>than the cabin, the CO can enter through many small
>openings into the cabin. Lowering the pressure in
>the tail cone would seem to help the problem, but
>how?
>Has anyone else experienced this problem?
>If so, any suggestions?
>
>BTW, we installed the AIM CO detector, recommended
>in an article on the subject on AVWEB. This device
>integrates CO levels over time, supposedly emulating
>accumulation in the blood over time. Besides having
>a digital readout of the current CO level, an audible alarm
>may happen in a few minutes at high levels, or after
>several hours (or even several flights) with moderate levels.
>
>Terry Seaver
>A135 / N135TD
>
>
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