One of the two U.S. Forest Service infrared line-scanning aircraft, N149Z, has a serious maintenance issue that may take it out of service for the rest of the season. If it were an NFL player, it would be called season-ending Injured Reserve.
The Beechcraft Super King Air 200 (twin-turboprop) has a problem with the right engine mounting, which has not been completely evaluated yet, so it is difficult to estimate when it will be back in the air. But it could be out for the rest of the western wildfire season.
There are presently no privately owned infrared line-scanner aircraft on call when needed status. If necessary, contract infrared services could be hired through an Emergency Equipment Rental Agreement by the local unit or the Geographic Area Coordination Center, as was done by the Lassen National Forest in 2012 on the Ponderosa Fire in northern California.
The other USFS IR plane is a twin-engine jet, N144Z, a Cessna Citation II. It continues to be in the starting lineup. Occasionally in past years they have outfitted a King Air B-90 with IR equipment.