Rockwell Shrike Commander 500 VH-EXD
This aircraft was operated as a coastwatch aircraft since the maritime surveillance was passed to the private sector (previously all surveillance was performed by the military). This aircraft was donated by SkyWest when the aircraft’s economical life expired and is being returned to complete configuration as parts become available. It is displayed in the colours of the Coastwatch organisation in the late 1980s.
For more technical detail, see Wikipedia.