The “Mud Shark” is the naval variant of the Ka-52 “Alligator” reconnaissance and combat helicopter, which in turn is a variant of the Kamov Ka-50 “Black Shark” (Chyornaya akula ...

The NTSB called its recommendation urgent and said it results from the investigation of a collision between an American Airlines regional jet and an Army UH-60 Black Hawk helicopter on Jan. 29.