As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO BASE AFTER GEAR FAILED TO RETRACT. MAINTENANCE DISCOVERED JAM NUT ON MLG ACTUATOR HAD LOOSENED ALLOWING ROD END TO MOVE IN RELATION TO ACTUATOR, THUS, PREVENTING THE GEAR FROM ENGAGING ON THE UPLOCK AS ACTUATOR DID NOT HAVE SUFFICIENT TRAVEL. SAFETY WIRE WAS STILL ON NUT, BUT HAD SEPARATED FROM ROD END. NUT PN 404528.