Investigators were still on scene of the fire and found two bodies on Wednesday.
Officials described the issue as a technical snafu by the county’s dispatch center, not an intentional act.
The plane crashed in mountainous desert terrain about 15 miles northeast of Wikieup and burst into flames with debris scattered over several acres.
A firefighter who suffered heat exhaustion during the Monday afternoon blaze was treated and released.
The fire department said one firefighter was transported to a hospital for "heat-related illness."