This is mostly about the sensor presented here:
http://plane.ardupilot.com/wiki/common-rangefinder-maxbotix-analog/From what I gathered, this sensor helps multi-rotors maintain precise altitude control but is there any use for this in Plane like landing?
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You might want to have a look at this:
http://diydrones.com/forum/topics/arduplane-and-sonar
I don't know that sonar is not supported per se but I do know that LIDAR is preferred/recommended for fixed wing landings.
thank you