Well, the mark one eyeball failed, as did the thinking department when I stumbled across the Bell 429 last weekend working power pylons along Auckland's Southern Motorway. I had seen the "XW" and instantly thought it was ZK-HXW but as "anon" pointed out and as observed yesterday it is actually ZK-IXW on the job! This airframe, 57026, was first registered in January 2011 as ZK-HXW and became ZK-IXW in July 2014 to make way for a newer Bell 429, 57175. to take up the HXW markings.
Roy reports from Wellington BK117 ZK-IVB, operated by Garden City Helicopters, has been on similar operations around the Capital.