Small Aircraft; Low Wing; 1 Eng; Fixed Gear
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument
Flight Crew Last 90 Days 120; Flight Crew Total 1200; Flight Crew Type 900
Communication Breakdown; Situational Awareness
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Flight Crew Executed Go Around / Missed Approach; Flight Crew Took Evasive Action
Human Factors
I was acting as the instructor for a student pilot training flight. Myself and my student were in the traffic pattern for multiple touch and go's. There were several airplanes in the pattern; and as one aircraft was on the upwind; we had just turned final. About 400 feet following a standard 3 degree VASI (Visual Approach Slope Indicator); I noticed a truck moving from the ramp area toward our landing runway. I kept an eye on the truck and continued to work with my student. We made all standard radio calls on the CTAF; and all other traffic in the pattern were making consistent radio calls.As we continued our descent to land; the truck crossed the runway hold short line and entered the active runway. At this point; we were roughly 100 feet on short final. I instructed my student to go-around; as he was the pilot flying. My student made a timely go-around to avoid the truck that had entered the runway. I recognized the truck as being a hangar tenant for a private hangar located across the airport. The private hangars are not owned or rented by the airport's operator; and crossing the runway is one of two ways to access the hangars. The other access point does not involving crossing runways. The truck never made a call to cross via a handheld radio; and I don't believe the occupant of the truck was using any sort of radio to actively monitor the airport traffic before crossing the runway.
An instructor pilot on short final at a non towered airport reported they ordered a go around when they observed a truck entering the runway