What was found
98-0141 - GPWS WARNING FOR GEAR AT 500 FT ABOVE GROUND LEVEL (FULL LANDING CONFIGURATION). DURING TROUBLE SHOOTING PROCESS, FOUND TAILSKID CANNON PLUG. INSTALLED GEAR PINS AND CYCLED GEAR AND FLAPS SEVERAL TIMES. ALL INDICATIONS WERE NORMAL. GPWS CHECKED NORMAL PER M/M 34-52-3, PAGE 102. SYSTEM OK FOR NORMAL SERVICE.