What was found
AT APPROXIMATELY 1635 LOCAL, IN CLOUDY CONDITIONS, ON A MAINTENANCE TEST FLIGHT, THE NR 1 ENGINE FIRE LIGHT BRIEFLY ILLUMINATED, THEN EXTINGUISHED. ALL ENGINE GAUGES INDICATED NORMALLY. ALREADY IN DESCENT, THROUGH 4,500 FT, AND CONTINUED TO A SAFE LANDING. MAINTENANCE DISCOVERED FAULTY LOWER AFT SENSOR AND REPLACED IT. (K)