A Northwest Airlines Boeing 747, Flight 723, experienced a significant landing incident at Miami International Airport. The aircraft ran off the end of runway 27L, resulting in substantial damage to the structure. A prior collision with a flock of sea gulls during takeoff from runway 27R triggered a shutdown of the No.4 engine, which was suspected of causing vibration. The crew subsequently requested a return to Miami, prompting a braking issue due to the wet runway surface’s low coefficient of friction and insufficient engine reverse thrust. The combined effect of these factors led to a directional control problem, restricting the use of the No. 1 and 2 engine reversers.A Northwest Airlines Boeing 747, Flight 723, experienced a significant landing incident at Miami International Airport. The aircraft ran off the end of runway 27L, resulting in substantial damage to the structure. A prior collision with a flock of sea gulls during takeoff from runway 27R triggered a shutdown of the No.4 engine, which was suspected of causing vibration. The crew subsequently requested a return to Miami, prompting a braking issue due to the wet runway surface’s low coefficient of friction and insufficient engine reverse thrust. The combined effect of these factors led to a directional control problem, restricting the use of the No. 1 and 2 engine reversers.