What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Received report of a flight control failure on a Cessna 172, registration N8388U, serial #17252288 during flight instruction with a certified flight instructor and a student pilot. Certified flight instructor and student were practicing stalls when, after 3 or 4 stalls, the yoke jammed in the rear position and the aircraft went into a spin. Aircraft lost over 700 feet of altitude before certified flight instructor was eventually able to recover after forcing the yoke forward. Certified flight instructor immediately flew back to kcps. Mechanic that responded found that the yoke had come into contact against a copper oil pressure line which severely limited yoke movement. Mechanic rerouted copper oil pressure line and ensured that wire bundles were clear of yoke movement.
As the FAA filed it
RECEIVED REPORT OF A FLIGHT CONTROL FAILURE ON A CESSNA 172, REGISTRATION N8388U, SERIAL #17252288 DURING FLIGHT INSTRUCTION WITH A CERTIFIED FLIGHT INSTRUCTOR AND A STUDENT PILOT. CERTIFIED FLIGHT INSTRUCTOR AND STUDENT WERE PRACTICING STALLS WHEN, AFTER 3 OR 4 STALLS, THE YOKE JAMMED IN THE REAR POSITION AND THE AIRCRAFT WENT INTO A SPIN. AIRCRAFT LOST OVER 700 FEET OF ALTITUDE BEFORE CERTIFIED FLIGHT INSTRUCTOR WAS EVENTUALLY ABLE TO RECOVER AFTER FORCING THE YOKE FORWARD. CERTIFIED FLIGHT INSTRUCTOR IMMEDIATELY FLEW BACK TO KCPS. MECHANIC THAT RESPONDED FOUND THAT THE YOKE HAD COME INTO CONTACT AGAINST A COPPER OIL PRESSURE LINE WHICH SEVERELY LIMITED YOKE MOVEMENT. MECHANIC REROUTED COPPER OIL PRESSURE LINE AND ENSURED THAT WIRE BUNDLES WERE CLEAR OF YOKE MOVEMENT.