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Are you referring to replacing the factory swing door to an air stair door? I have never seen this done and would have to be a field approval if the frame would even accommodate without structural engineering. That would never happen in my opinion. Curious why you would want to change the door? Just buy a 337 with the air stair door.
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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