Medium Transport
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Distraction; Time Pressure
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Ground Equipment Issue; Ground Incursion Runway
Flight Crew Executed Go Around / Missed Approach; Flight Crew Took Evasive Action
ATC Equipment / Nav Facility / Buildings; Airport; Company Policy; Human Factors; Procedure; Weather
While on approach into ZZZ; an aircraft on the ground reported an APU fire message they had on approach and that they believed there was no fire. While we were on short approach into ZZZ a fire vehicle pulled out of the fire station and up to the hold short line and said they were going to cross the runway. We made two radio calls stating we were on short final and the fire vehicle stated that they know we are on short final and that they will be off the runway momentarily. We performed the balked [landing] in ZZZ at about 100 feet because the fire vehicle was still on the runway. We then returned back to the field and landed.[There was a] possible fire for [an] aircraft on [the] ground on the opposite side of [the] runway fire station. [It was] night time with rain that possibly lowered visibility from the ground; but flight visibility was at least 10 miles [and the tower was closed]. Enhanced training for operators of ground vehicles that may operate on the runway [is recommended].
Air carrier Captain reported executing a go-around due to a fire truck entering the runway on short final to an airport when the Tower was closed.