P PT. PP Urban Precast is a subsidiary of PT. PP (Persero) Tbk, which isengaged in construction services, building management and precast concreteproduction. In the manufacturing sector, PP Urban produces and develops precastconcrete and ready-mix concrete products to meet the needs of the constructionindustry.The research focuses on the PC Hollow Girder casting stage, the processcarried out is pouring fresh concrete from a mixer truck to a cast bucket, lifting thecast bucket to the top of the mold using a gantry machine, pouring fresh concretefrom the cast bucket into the mold, vibration process in the mold with external andinternal vibrators. Human error occurred at the casting stage in several processeswhich resulted in the production process being hampered. One of the causes ofhuman error can occur because the gantry machine operator makes an error pressingthe remote gantry machine more than 2 buttons which causes the gantry machine tojam or die. This study aims to identify human errors at the PC Hollow Girder castingstage using the Systematic Human Error Reduction and Prediction (SHERPA) andHuman Error Assessment and Reduction Technique (HEART) methods andpropose improvements to reduce the human error factor. Human error identificationuses the Hierarchical Task Analysis (HTA) method to break down the work process,the SHERPA method to identify the possibility of human error occurring and theHEART method to determine the probability of human error. The results ofidentification using the SHERPA method are known that from 12 activities thereare 6 error activities with 3 activities having a high probability, while with theHEART method, the highest Human Error Probability is obtained in subtask 2. 2Pressing the remote to control the passage of the gantry machine onto the moldcaused by an error in pressing the remote controller for the direction of the gantrymachine, which is 1.968. From the identification results, it is proposed to improvethe design of Standard Operating Procedures (SOP) to operate the remote gantrymachine which is implemented by attaching it to the side of the remote storage area,a checklist for the vibrator machine which is implemented by giving the workers aboard and ballpoint pen at the same time and socialization is carried out by meansof counseling related to SOPs and checklists every 6 months to the mechanical teamand engineering staff to operators in charge of running gantry machines and vibratormachines.