NTSB Factual Report

On June 26, 2018, about 0850 mountain daylight time (MDT), a Bombardier Learjet 60 airplane, N57Z operated as Flight Check 57, sustained substantial damage after a brake fire while taxiing for departure at the Salt Lake City International Airport (KSLC), Salt Lake City, Utah. The airplane was registered to and operated by the Federal Aviation Administration (FAA) as an instrument flight rules (IFR) flight under the provisions of 14 Code of Federal Regulations Part 135 when the accident occurred. All three people on board (two certificated airline transport pilots and one technician) were uninjured. Visual meteorological conditions (VMC) prevailed, and an IFR plan had been filed.

The mission specific modified airplane is used to perform flight inspections of the National Airspace navigational systems.

After refueling at a fixed base operation, the airplane taxied down taxiway Kilo for a runway 17L departure. While taxing, the right main brake ignited and the fire spread, resulting in substantial damage to the fuselage and right wing.

The closest weather reporting facility was Salt Lake City International Airport (KSLC), Salt Lake City, Utah. At 0854, a METAR from KSLC was reporting, in part: wind 290 at 7 knots, visibility, 10 statute miles, clouds and sky condition, few clouds at 11,000 ft; temperature, 86° F; dew point 37° F; altimeter, 30.04 inches of Mercury.

The airplane was equipped with a solid-state cockpit voice recorder (CVR), and a download of the CVR data is pending.