After looking at the first aircraft in Eagle Air's fleet last week (http://3rdlevelnz.blogspot.com/2010/04/eagle-beech.html) it is Air Nelson's turn this week.
The air service began on the 16th of December 1985. The company rapidly expanded and ZK-NSN was often seen of scheduled services across Cook Strait, namely from Wellington to Nelson, Blenheim and Motueka from Nelson to Palmerston North and Westport, and from Oamaru to Timaru and Christchurch.
In December 1996 NSN was sold to Associated Airlines who took over Motueka Wellington service. ZK-NSN continues to fly for Great Barrier Airlines, primarily for their charter work.