What was found
NR 1 ENGINE LOW WARNING ILLUMINATED IN FLIGHT. NG DROPPED AND FLICKERED BEFORE BECOMING ZERO. ENGINE RETARDED TO GROUND IDLE, ALL OTHER INDICATIONS NORMAL. AIRCRAFT LANDED NORMALLY ON ONE ENGINE. NR 1 ENGINE NG TACHOMETER ELECTRICAL CONNECTOR FOUND DETACHED FROM TACH. CONNECTOR RESECURED AND GROUND TEST CARRIED OUT. OPERATION FOUND TO BE NORMAL. ALL OTHER ENGINE TACH GENERATORS INSPECTED FOR CONNECTOR SECURITY AND FOUND SECURE.