The ones in your car don’t need a couple of hundred meters of wiring from wingtips to an avionics bay.
What happens if it starts chirping during a takeoff roll? You could inhibit it above a certain speed but then you have to integrate it with other systems, making it more expensive.
The cost of developing, certifying, installing, maintaining and carrying it far exceeds the cost of the remote chance of a wingtip strike happening to your aircraft.
Last edited by Una Due Tfc; 29th Nov 2017 at 13:59.