The O2's have a crank out window, yep a window crank like a 68 Camaro, and was good for flight at 90 degrees from the door. I don't think Cessna ever expected anyone to fly around with the door window open in flight. I do not recall seeing anything that says you can't but there is nothing about the option during flight.
Put an O2 door on your bird and then hey, crank it on out at 9,000 feet
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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