What was found
AFTER LANDING GEAR RETRACTION 8-10 LOUD BANGS WERE HEARD AND VIBRATIONS WERE FELT IN THE COCKPIT FLOOR. THE GEAR UNSAFE LIGHT REMAINED ON DURING THE ABNORMAL GEAR RETRACTION. AT APPROX. 1000 FT ABOVE THE GROUND THE GEAR FULLY RETRACTED AND THE UNSAFE LIGHT WENT OUT. GEAR EXTENDED NORMALLY UPON LDG. TROUBLESHOT TO A NOSE STRUT REQUIRES SERVICE. SERVICED NOSE STRUT IAW MM 32-20-00 REV 7 AND CYCLED GEAR TEN TIMES IAW MM 32-00-00 REV 13 WITH NO DISCREPANCIES NOTED.