Chief Coroner Lorraine Walker announced earlier this week a coronial inquiry would focus on the 45-minute period it took for Defence to alert the Emergency Services Agency its helicopter had ignited a blaze in the Namadgi National Park.

Mr Barr said he was not interested in a blame game over the accident, and the incident had already been the subject of multiple reviews.

"If there's something new that emerges that hasn't already been well canvassed, then it may well be a useful exercise," Mr Barr said on ABC Canberra.

Mr Barr said the inquiry "may well make some people happy" if it adds to the understanding of Defence's actions.

"And, to that extent, I'm agnostic about the process," he said.

Earlier this year ACT Chief Minister Andrew Barr likened media scrutiny of Defence's role to a "witch hunt", insisting that an "endless circular blame game" would achieve nothing.

On Friday, Mr Barr said he was still not interested in a witch hunt.

"And I don't think most people are. I said at the time, and I stand by that, that there's lessons to learn, obviously," he said.

"At the time, Defence didn't provide immediate information. They later have, obviously. And the arguments that have been put forward by them reflected the pilot's need to ensure the safety of the crew, etc, etc.

"Everyone can have an opinion on what happened. I wasn't there, I don't have any basis to inform an informed opinion. Now, if the Coroner wants to explore that further, that's fine."

Mr Barr said he was not interested in pursuing a blame game or finger pointing over the accident.

"I have a megaphone and I'm expected to have a megaphone and to have a view on everything. But I will not participate in what is just a pile-on for the sake of providing a grab that's useful to fuel someone else's agenda," he said.

MORE ON THE ORRORAL VALLEY FIRE:

The ACT's Attorney-General chose not to launch a coronial inquiry into the origins of the fire last month, because he believed it would not shed new light on the start of the blaze.

Shane Rattenbury last month told residents affected by the fire, who had called for an inquiry, that such a probe would not materially advance understanding of what happened.

"Defence has co-operated with the ACT government on all aspects of the Orroral Valley Fire and I do not believe that a coronial inquiry would elicit further information that would be of public benefit," Mr Rattenbury wrote.

Defence would fully participate in the inquiry, a spokesperson said on Wednesday night. The ACT government and its Emergency Services Agency had already confirmed their participation.

The fire burned through 80 per cent of Namadgi National Park after it ignited about 1.30pm on January 27.

Defence took 45 minutes to alert the ACT Emergency Services Agency after the fire was started, but ACT authorities say the fire was spotted 19 minutes after it was ignited.

Our journalists work hard to provide local, up-to-date news to the community. This is how you can continue to access our trusted content: