Members of the public helped when Wellington's Westpac Rescue Helicopter lifted a man off Mount Kaukau with a suspected broken leg.

Wellington's Westpac rescue helicopter has plucked a man, who is thought to have broken his leg, off Mount Kaukau.

Barry Durrant was at the peak of the north Wellington hill sipping coffee when he noticed the helicopter getting near and slowing down.

Durrant - a former press photographer - said someone ran to the summit to say a man had broken his leg just below the top ot the hill about 9.30am on Sunday.

BARRY DURANT Wellington's Westpac rescue helicopter on Mount Kaukau on Sunday morning.

The helicopter landed in a "big cloud of dust" and paramedics went to the aid of the man, Durrant said.

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As they were about to carry the man back to the helicopter in a stretcher, Durrant offered to help and was told to get four volunteers, who he found and who rapidly agreed and helped paramedics load the man into the rescue helicopter.