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The fire is on Cornwallis Rd, near Huia.
Fire communications shift manager Steve Smith said there were houses in the area, but he did not know if they were at risk.
Emergency services were alerted to the fire at 3.20pm and another helicopter is on standby to help fight the blaze, if needed.
Witnesses have said the fire is in bush at the Kakamatua Inlet, between Cornwallis and Huia.
A resident, whose house is on a hill near the fire, wrote on Facebook that a helicopter had attached a monsoon bucket on her lawn.
The woman said she was not at home, but her house had been fire-protected.
"They have gelled our house and lawn and everything and [are] squirting water from our lawn. We are all away but have other family members there helping," she wrote.