The Scratching Noise on the Aircraft's Backbone

There was always something a shutter movement on top of aircraft center thinking that we'll indicate it to be up there at this time of morning you know and not thinking anything of it so you know curiosity. Maybe it's something the guys are doing maybe it's secret maybe I shouldn't be knowing about this I need to be getting on with my job correct, he says. "I heard a screeching noise like somebody trying to scratch glass that's what really draw my attention after the after the first incident when something jumped on the backbone it shuttered the aircraft"