The FAA is proposing a $777,000 civil penalty against Horizon Air Industries for allegedly operating 32 Bombardier Dash-8-400 turboprops on 49,870 flights when the aircraft were not in compliance with Federal Aviation Regulations. The FAA alleges Horizon installed new external lighting systems but didn’t conduct required tests for radio frequency and electromagnetic interference before returning the aircraft to service. The FAA discovered the compliance problems during routine surveillance. Horizon immediately completed tests and inspections before further flights.