Gah, and doesn't show up as an orange dot? Oh well my fault for assuming that black boxes are found in the cockpit
OK, so how do you actually get this black box mission and where?
Well Assumtion is the mother of all F*** ups, And anyhow in Real Life the Blackbox is normal 1) Not Black, it is bright orange to help find it, if a plane crashes, 2) located in the tail of the plane to help protect it from the most violent of crashes i.e. Nose first
But glad you have now finished the mission