Single engine air tanker assists firefighters on a wildfire near Denver

Ice on the landing gear of Air Tanker 861
Ice on the landing gear of Air Tanker 861 after dropping water on the Oak Fire, Dec. 27, 2021. Photo by Chief Pilot Chris Doyle.

Monday afternoon December 27 a fire southwest of Denver burned 152 acres and prompted evacuations.

The Oak Fire was reported around 2 p.m. southwest of Columbine, southwest of the C470 highway which was temporarily closed. West Metro Fire said it started near the C470/Kipling intersection west of the Westerly Apartments in an open space area with several trails and heavy foot traffic. The specific cause is still under investigation. The evacuations were cancelled Monday evening.

Oak Fire, on the southwest side of Denver, Dec. 27, 2021
Oak Fire, on the southwest side of Denver, Dec. 27, 2021. Photo by West Metro Fire.

A single engine air tanker from CO Fire Aviation was mobilized from Fort Morgan, Colorado, flown by the company’s Chief Pilot Chris Doyle. The Air Tractor took off at 3:46 p.m. and 20 minutes later landed at Northern Colorado Regional Airport NCRA near Fort Collins to get a load of plain water which took about 10 minutes. It then made the 19-minute flight south to the fire where it quickly sized it up, dropped the water just before sunset, and returned to NCRA.

Air Tanker 861 (N803NZ) drops on the Oak Fire Dec. 27, 2021
Air Tanker 861 (N803NZ) drops on the Oak Fire Dec. 27, 2021. Still image from West Metro Fire video.
Flight path of Air Tanker 861 Oak Fire
Flight path of Air Tanker 861 (N803NZ) while working the Oak Fire Dec. 27, 2021. FlightAware.

The fire was driven by strong winds. Buckley Air Force Base on the east side of Denver recorded 22 to 28 mph out of the south with gusts to 35 while the relative humidity was in the high 20s with the temperature in the high 30s. However it was cooler on the other side of the city at a higher elevation near the fire, judging from the ice seen on the landing gear in the photo above.

Firefighters always get a lot of satisfaction conducting a mobile attack. The videos below show how an engine drives near the edge of the fire while one or two firefighters operate nozzles while walking, sometimes one in front of the engine and another picking up what’s left behind the truck. Or a second engine could followup, making sure all the heat near the edge is extinguished.

Oak Fire, Dec. 28, 2021
Oak Fire, Dec. 28, 2021. Photo by West Metro Fire.