The families of the two Texas Army National guard chief warrant officers who died in a 2016 crash are suing Boeing. The officers, Chief Warrant Officer 3 Dustin Lee Mortenson and Chief Warrant Officer 2 Lucas Maurice Lowe, were flying an AH-64D on December 28. The families are suing Boeing for an unspecified amount of money, reports SE Tax Records.

The original petition says the crash happened “when the number two composite main rotor blade, the number two lead lag link, and its associated pitch housing separated from the rotor head. That separation of the number two composite main rotor blade caused an inflight break-up of the helicopter”