The most convenient place to mount the AOA "flap switch" is under the left seat. I've seen a couple different methods, but the easiest I think is top use the tube that moves the flap and attach and ear. This ear will go by the micro switch mounted on a fabricated bracket and close at the appropriate time. (check the install drawings for the exact angle of deployment). I've also seen this switch incorporated with the flap position sensor which would require only one bracket fab.
I'll look for pictures.

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