The operator was engaged in spraying chemicals on a block to the west of Kaeo in Northland. The pilot completed the spraying operation and landed for the purposes of washing and refuelling the aircraft prior to the ferry flight to the overnight rest area, approximately five km away. The aircraft was particularly contaminated with the chemical and required extensive soap washing at the site with three to four times more soap and water than is usually applied. It was then refuelled with 70 litres.
The pilot took off in the dark, at approximately 1815, to fly to the nearby hostel. Daylight officially ended at 1755. After climbing out vertically, the pilot realised that he was having engine trouble. When the collective was raised the engine was still delivering power but would not respond. The pilot elected to carry out a precautionary landing but, in the dark, had difficulty finding a suitable place even though he knew the topography. He caught a glimpse of the dirt road below him so elected to attempt a landing there.
Due to the darkness he misperceived the rate of descent and due to the engine problem was unable to flare effectively. He hit the ground hard, short of the intended landing point. The helicopter rolled over. After extricating himself, the pilot noticed that the aircraft was on fire. The ELT had activated and was detected. RCCNZ contacted him two minutes after the accident. The aircraft was almost completely destroyed by the fire.