Helicopter pilot Alan Beck is fighting the blaze near a radio site at the summit.
He says there is a strong wind where he is and they are trying to stop the front from moving into transmission lines and homes.
"We're in the clear here now, but you just know it's going to turn dirty in a couple of hours"
The fight to extinguish a huge, out-of-control fire in Christchurch's Port Hills has entered its fourth day.
Helicopters stand out starkly against the smoky sky. More than a dozen choppers were in the air on Wednesday trying to douse the flames from above. Photo: Supplied / Matthew Rankin
