In the world of aviation maintenance, FOD—or foreign object damage, or foreign object debris—is often a smile ender.
Some refer to FOD as foreign object damage, but the FAA addresses the problem within its Foreign Object Debris Program. According to the FAA, FOD is “defined in Advisory Circular 150/5210-24 as any object, live or not, located in an inappropriate location in the airport environment that can injure airport or air carrier personnel and damage aircraft.” That sounds pretty serious to me.
