Sydney man's romantic proposal goes very wrong when their helicopter crashes. But it didn't stop him.

Sydney man Mitchell Green wasn’t going to let a little thing like a helicopter crash stop him from proposing to his girlfriend on their New Zealand holiday.

The Penrith resident and his partner of seven years, Kaydee Gosper, were among six people on board when the Eurocopter Squirrel AS350 B2 rolled over while attempting a snow landing at Mount Sale near Queenstown on Monday.

Despite suffering injuries to his leg, the Penrith man went ahead with his plan to pop the question, presenting the 24-year-old with a ring as passengers were still being pulled from the wreckage.

“Mitch, as he couldn’t walk, he had his arm around me. We were trying to get away from the helicopter and he said he couldn’t wait any longer,” the hairdresser told The New Zealand Herald.

“He pulled it [the ring] out and he put it on my finger.”

The wreckage/site of the proposal. Image: New Zealand Police.

The pilot of the chopper has been stood down by his employer Skyline Enterprises, as authorities investigate the crash.

The company's chief executive, Jeff Staniland, told The New Zealand Herald that he wouldn't speculate on how long the pilot would be suspended.

"We need to talk to him and see how he feels - we don't want to put pressure on him," Staniland said. "He's going to be interviewed [by New Zealand's Transport Accident Investigation Commission] and needs to focus on that."

He had been employed by the company for two years.