A Queensland Fire and Emergency Services spokesperson said the helicopters went down off Grapetree Rd, while carrying out "water-bombing operations at the Pechey fire".
The pilot suffered "non-life threatening injuries" during the crash and is now being treated by paramedics.
The spokesperson said the pilot had to make a "hard landing"
Fast-moving bushfires continue to burn int the area.
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Meanwhile, residents of an isolated riverside suburb in Noosa have been evacuating via ferry as more than 60 fires burn around the state of Queensland.
A "leave now" warning has been issued for Noosa North Shore, on the northern banks of the Noosa River, where a ferry is the sole escape route.
"People leaving the area should take the Noosa River Ferry to Moorindil Street," the fire service said.
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Queensland premier Annastacia Palaszczuk said 14 homes have been lost around the state.
"Now is not the time to be complacent, the conditions are of concern to us," she said.
A severe fire danger warning is in place for a large swathe of southern Queensland, with soaring temperatures and thunderstorms expected on Wednesday.
Acting Queensland Fire and Emergency Services Commission Michael Wassing said, "we've got another tough day today and there is an extended forecast that we are not out the woods by any means".
In addition to Noosa North Shore, other "leave now" warnings are for Kilkivan and for a large fire burning in difficult terrain near the five-star Spicers Peak Lodge on the Southern Downs.
That fire is now burning between containment lines and is not directly impacting properties.
Resort managers knew some days ago that fire would likely threaten the property, and began advising guests not to keep their bookings.
Only a couple of staff remain on-site.
Authorities are most concerned about the sheer size and number of fires burning in parched land that is difficult to access.
There are several fires west of the Gold Coast, including in the Scenic Rim, that officials are anxiously watching.
Mayor Greg Christensen fears another black day, two months on from September fires that destroyed 11 homes and the historic Binna Burra Lodge in the hinterland and Scenic Rim.
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"With the volatility of the wind, the extreme temperatures and the pre-heating already of the fuels, events can unfold very rapidly and we're stressing the urgency of being prepared," he said.
A blaze in Cobraball near Yeppoon in central Queensland continues to be of significant concern.
It has claimed 13 of the 14 houses lost in Queensland since late last week.
Winds are already picking up and temperatures in some areas are expected to be 6-8 degrees above average.
"We've got really hot, we've got really dry, windy conditions," the Bureau of Meteorology's Victoria Dodds said.
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Conditions are expected to ease on Thursday, but temperatures are heating up further into the weekend.
A severe fire danger warning is in place for the drought-stricken Darling Downs and Granite Belt, the Wide Bay and Burnett region, and the southeast coast taking in Brisbane and the Gold and Sunshine Coasts.
Fire authorities are comfortable with the resources Queensland has to deal with the day that lies ahead, including 40 aircraft, and crews from New Zealand, Tasmania and the Northern Territory.
Health officials have warned vulnerable people to stay indoors, with air quality expected to plunge again on Wednesday as smoke from the Queensland and NSW fires spreads.
