What was found
IN-FLIGHT SELECTOR VALVE COULD NOT BE CHANGED FROM LEFT TANK. MULTIPLE ATTEMPTS MADE TO CHANGE FUEL SELECTOR POSITION. AIRCRAFT ENGINE QUIT. AN OFF-AIRPORT EMERGENCY LANDING WAS MADE. FUEL WAS DELIVERED TO THE PLANE AND IT WAS FLOWN BACK TO THEIR AIRPORT. THE FUEL SELECTOR VALVE WAS REMOVED AND DISASSEMBLED. THE INTERNAL NYLON PART THAT ACTUALLY DETERMINES THE SELECTOR POSITION WAS FOUND BROKEN. ONCE THE NYLON SHEARED, THE PIN WAS DISLODGED AND FORCED TO ONE SIDE MAKING THE SELECTOR TOTALLY INOPERATIVE. THIS AIRCRAFT IS USED FOR FLIGHT TRAINING, SO SELECTOR VALVE GETS A GREAT DEAL OF USE.