A AS 355 helicopter with a PA 28 aeroplane, both on Police patrol flights over Auckland City, collided on 26 November 1993. Safety issues discussed include the limitations of the "see and avoid" concept of collision avoidance, the use of radio contact between aircraft and the variety of radio frequencies in use.
He promulgate a single advisory radio frequency for aircraft in the uncontrolled airspace between Auckland and Whenuapai Control Zones, including Mechanics Bay ATZ.
