As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE STUDENT PILOT AND FLIGHT INSTRUCTOR WERE PRACTICING POWER-OFFS STALLS WHEN THE THROTTLE BECAME STUCK AT THE IDLE POSITION. DUE TO THE MECHANICAL PROBLEM, THE FLIGHT INSTRUCTOR LANDED THE AIRCRAFT IN A VACANT FIELD. THERE WERE NO INJURIES TO THE PILOT OR FLIGHT INSTRUCTOR, AND THE AIRCRAFT WAS NOT DAMAGED.