F.O.D. Debris.
A foreign object damage (often known as F.O.D.) is when an object that it's not related to an aircraft hits
it and causes damage. Due to it's exclusive happenin in the ground it's almost no probable that it could cause a fatal accident, however it depends on the flying phase because if it happens during the takeoff the object can damage vital plane components and cause a fatal crash after going through the air.