Video: Helicopter falls apart on landing Brazil's Regional Service for the Investigation and Prevention of Aeronautical Accidents is looking into the reasons why a rescue helicopter disintegrated shortly after landing in the northern state of Para on Wednesday. Amateur images taken by the Para Fire Department showed how the aircraft came apart while vigorously vibrating. Officials believe the helicopter experienced what is known as ground resonance, a condition that happens when the aircraft's rotor is working while the helicopter is on the ground. Four people that were travelling aboard the helicopter were injured.