sj
Staff member
Northwest Arkansas
Got the skywagon back from a mega annual which included a new bladder and a bunch of other stuff, but one of the BIG expenses was replacing both exhaust manifolds with brand new as the old ones were no longer serviceable. Bear in mind I replaced both exhausts last annual due to CO when the heat was pulled. So now that everything is new, we flew down to K81 for a little BBQ picnic from the on-field restaurant
Laura even brought flowers for the table.
Now completely stuffed we get back in the plane with a great tailwind and a few minutes into the flight I hear "carbon monoxide warning" over my headsets from my Sentry ADSB gadget. I didn't even know it did that (through Foreflight), but it's a pretty cool feature because I NEVER look at the little light where I have it placed.
Now our minds are racing. We are not running the heater anyway, but we open all the vents and the warning and light goes away. Close them, then it comes back on. Back downtown we go.
Today, we went out to test it again with three different CO detectors. We tried ever configuration of heat, cabin air, carb heat, and flight direction and speed (downwind, upwind, slow, flaps etc) could never get the Sentry to go off again. Our highest reading on the flight was 14 or so, which ain't much. Most of the time it was 4 or 5. The high dollar Fluke tester did not agree with the one behind it at lower levels, but was in sync above ten. The cabin heat knob made zero difference nor did the cabin air.
So I guess the question is, what do you think? Was it a false positive? The Sentry might have been in the sun while we were having lunch - although it was not a hot day. I of course looked at all the exhaust connections and they look great.
Your thoughts are appreciated!
sj
Laura even brought flowers for the table.
Now completely stuffed we get back in the plane with a great tailwind and a few minutes into the flight I hear "carbon monoxide warning" over my headsets from my Sentry ADSB gadget. I didn't even know it did that (through Foreflight), but it's a pretty cool feature because I NEVER look at the little light where I have it placed.
Now our minds are racing. We are not running the heater anyway, but we open all the vents and the warning and light goes away. Close them, then it comes back on. Back downtown we go.
Today, we went out to test it again with three different CO detectors. We tried ever configuration of heat, cabin air, carb heat, and flight direction and speed (downwind, upwind, slow, flaps etc) could never get the Sentry to go off again. Our highest reading on the flight was 14 or so, which ain't much. Most of the time it was 4 or 5. The high dollar Fluke tester did not agree with the one behind it at lower levels, but was in sync above ten. The cabin heat knob made zero difference nor did the cabin air.
So I guess the question is, what do you think? Was it a false positive? The Sentry might have been in the sun while we were having lunch - although it was not a hot day. I of course looked at all the exhaust connections and they look great.
Your thoughts are appreciated!
sj