Jeff Ingelse took this photo of an Erickson Aero Tanker MD-87 parked at Redmond, Oregon Monday morning. He said both of the MD-87s at the airport had similar stains on the fuselage approximately the color of fire retardant. The air tankers made multiple sorties to the Two Bulls Fire over the weekend, dropping retardant.
Earlier on Fire Aviation the question was raised about the possibility of retardant being ingested into the engines. From the photo above, we of course can’t tell if that is an issue or not. Maybe Erickson Aero Tanker has it all figured out and it is not a problem.
A video of the MD-87 being tested. It was uploaded to YouTube April 15, 2013.