Based on the Republic of Indonesia Government Regulation number 50 of 2012 concerning the Implementation of the Occupational Safety and Health Management System Article 5 paragraphs 1-4, companies are required to apply SMK3 if the company has at least 100 (one hundred) workers, or has a high level of potential danger. PT Angkasa Pura I (Persero) Adi Soemarmo employs more than 100 workers, therefore companies must implement the K3 Management System. The purpose of this study is to evaluate the performance of the implementation of SMK3 as a benchmark for companies in future audits. The method used is in depth interview and for the analysis of improvements using fishbone diagrams. The results of the conformity of the implementation of SMK3 with PP number 50 of 2012 in the year of 2019 amounted to 78.13% which means it has not been able to reach a satisfactory value (85-100%). Proposed improvements to evaluate the non-conformity of several criteria, one of which is to raise the concern of the leader in supervision to be firm in the operation of the program kerja from the K3 unit
