What was found
NR 4 ENGINE FIRE WARNING ILLUMINATED IN FLIGHT. OVERWEIGHT LANDING AT 277.0 LBS PERFORMED. REMOVED AND REPLACED NR 4 FIRE SENSOR ON BURNED SECTION OF THE ENGINE IAW MM 26-10-1. ALSO REWIRED FROM PL-1341 CONNECTOR TO PL- 1368, PL-1367 CONNECTOR AND REPLACED CONNECTORS PL-1368 AND PL-1367. NEEDS OPS CHECK. ACCOMPLISHED SPECIAL STRUCTURAL "A" INSPECTION IAW ARROW AIR DC-8 MM, VOLUME I, 60 SERIES PAGES 5-4-8 TO 5-4-16 NO VISUAL DEFECTS NOTED. REMOVED AND REPLACED NR 4 FIRE DETECTOR SENSOR UPPER FORWARD IAW 26-10-1. OPS CHECKED NORMAL ON GROUND. SYSTEM ENGINE TEST NORMAL IAW MM 2-6-10.