What was found
LT GEAR COLLAPSED UPON LANDING. ACFT WAS FERRIED BACK TO DEPARTURE FOR MX AND REPAIR. PERFORMED AN OPS CHECK OF GEAR RETRACTION AND EXTENSION IAW MM. NOTE: LT GEAR IS FIRST TO RETRACK AND FIRST TO EXTEND. PERFORMED EMERGENCY PROCEDURE AND ALL CHECKED GOOD. NR9) INSPECTED ELECTRICAL CIRDUIT FROM C/B (LANDING GEAR CONTROL) TO HYD POWER PACK, FOUND 2 LOOSE CONNECTIONS, 1 AT CB AND THE OTHER AT BUS TIE SWITCH. REPLACED HYDRAULICS POWERPACK UNIT (INCLUDING SHUTTLE VALVES) WITH O/H UNIT. AIRCRAFT TEST FLOWN AGAIN, ALL SYS CHECKED NORMAL. WE HAVE REVISED OUR LIFE LIMIT ON HYD POWERPACK IAW 227-SL-037.