A night of back burning and water bombing has secured the township of Kooralbyn, but a large bushfire will continue to burn for days to come, firefighters say.

Rural Fire Service incident controller Kaye Healing said the Scenic Rim had, so far, dodged a bullet thanks to favourable conditions that had allowed her crews to keep the fire within containment lines.

But she said some properties were in an “absolutely shocking” state of preparedness.

“There was the potential for far more losses if we’d had more severe fire weather,” Ms Healing said on Wednesday morning.

Queensland’s new 10,000-litre capacity Large Air Tanker was deployed for the first time in the south-east to drop a line of fire retardant. This, combined with Tuesday night’s back burning efforts, was enough to secure Kooralbyn.

“We had 18 appliances on the ground back burning,” Ms Healing said.

“The back burn was about 7 kilometres long and it took about 10 hours all up. It was effective, so this morning we are in the process of just monitoring and mopping up and making sure nothing is getting across the break.”

She said five crews were on the ground as “it won't take much for it to get across that break”.

The fire continues to run in “broken” and inaccessible country, full of ridges and valleys and creek lines, and has so far burnt about 5,300 hectares.

Firefighting efforts were focussed on the fire’s second “predominant front”, around the Green Hills Road area. Ms Healing said crews were gathering intelligence on the ground and from the air in preparation for a back burn on Wednesday night.

A dilapidated and uninhabited building, or “some sort of shed”, had been burnt several days ago but no property had been lost so far, or was under any threat.

Firefighters are expecting “a good week of some level of activity on the fire ground”, and will be looking to make the most of current conditions.

“At the moment we’re in good shape,” Ms Healing said.

“The concern that we’ve got is that we know towards the end of the week, and early next week, temperatures heat up again and the relative humidity drops.

“So while we've got favourable conditions over the next couple of days after that, as the moisture burns off completely, the potential for relights is certainly there.”

The RFS incident controller urged residents to monitor the situation and prepare themselves and their properties.

She said under the favourable conditions, firefighters had been able to help people remove leaf litter from their gutters and yards.

“But at the end of the day, if we get a hard running fire, we don't have time to do that,” she said.