What was found
CREW REPORTED, UNABLE TO RETRACT GEAR AFTER TAKEOFF. RECEIVED LANDING GEAR NOT UPLOCKED AND SHOCK ABSORBER ECAM FAULTS. *S/D* TIGHTENED NLG BARREL FITTING BOLT FOR PROX SENSORS REF IPC 32-21-11-13 ITEM 60. SECURED WITH LOCK WASHER, OPERATED LANDING GEAR, ALL INDICATIONS NORMAL. COA 403250 INITIATED TO CORRECT THIS PROBLEM. HOWEVER, IT WAS NOT ACCOMPLISHED ON THIS AIRCRAFT TO DATE. A SECONDARY LOCKING FEATURE WAS INCLUDED WITH THE BOLT TO PREVENT THE BOLT FROM LOOSENING.