What was found
DURING TAXI, RIGHT MAIN LANDING GEAR STRUT ASSEMBLY BROKE AT ACTUATOR ATTACH COLLAR. UPON INSPECTION, FOUND STRUT HAD LOST NITROGEN CHARGE AND HAD BEEN TAXIED IN THE FULLY DEPRESSED POSITION, POSSIBLY DAMAGING THE STRUT INTERNALLY. THE LANDING GEAR DID NOT RETRACT SUCCESSFULLY AND THEN THE AIRCRAFT LANDED WITH THE GEAR JAMMED IN THE FULLY EXTENDED POSITION CAUSING THE UPPER BARREL TO FRACTURE AND FINALLY FAILED COMPLETELY WHILE TAXING TO THE GATE.