THINK THE S4 cardboard carbon monoxide detector stuck on the instrument panel of the airplane you are flying is sensitive enough to keep you informed of elevated CO levels in the cockpit? Think again. I tested the Sensorcon AV8 Inspector Pro in my 1947 Cessna 140 and was surprised by what I saw. At engine start, the CO level was very low-three parts per million (PPM). You can view the real-time CO level on the LCD screen, or you can press a "Max" button to display the maximum CO level from the time the unit was turned on. During takeoff and climbout, the reading increased to 17 PPM. Sounds scary, but the chart at right included with the instructions indicates this level is still relatively low.
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