A firefighting tanker landed safely at Durango-La Plata County Airport on Monday after shutting down a troublesome engine.
The four-engine Lockheed P2V landed using three engines. The airplane has two radial propeller engines and two jet engines.
Airport officials put firefighters on alert.
"We did have our trucks out of the base on standby as a precautionary measure," said airport spokesman Don Brockus.
Ed McCaw, air tanker base manager for the U.S. Forest Service, called the incident a "routine three-engine landing."
The tanker was expected to be ready for service later Monday. The crew "thought they had a problem with (an engine), so they shut it down," McCaw said.
The tanker is owned and operated by Neptune Aviation of Missoula, Mont. It was contracted by the Forest Service to help fight the Ruiz Fire in the Jemez Mountains of the Santa Fe National Forest.
A Neptune tanker crashed April 25 in Utah, killing three.