Somewhere in this thread someone said "the microswitch on the airbrake
handle is the no-brainer part".

Detecting the handle position gives no protection for deployment of a
disconnected airbrake.

Cambridge 302, and I think L/S Navs, include a takeoff airbrake open
warning based on airspeed. It works well, but would need 2 in-wing
sensors to detect an open disconnected airbrake.



Andy