Golden Bolt designed to prevent Foreign Object Damage Published April 24, 2009 LACKLAND AFB, Texas -- Foreign Object Damage, or FOD, occurs when small objects like pebbles, nuts and bolts , are left on the aircraft parking ramp. Those foreign objects can then be sucked into the intake of a running aircraft. The Golden Bolt program, or Eldorado, is a program designed to add a little fun to the Monday FOD prevention walk. The search for El Dorado takes place on Mondays after each Unit Training Assembly weekend. The idea is to encourage diligent searches for foreign objects and those who find the gold painted bolt will be awarded a certificate and varying prizes.