OBS_VALUE: <ul><li><a href=https://sso.agc.gov.sg/Act/CAASA2009 target=_blank>Civil Aviation Authority of Singapore Act(Civil Aviation Authority Of Singapore Act(Chapter 41)(Original Enactment: Act 17 Of 2009).Revised Edition 2014(31st May 2014). Issued on 1 st July 2009. Last amended on 30 July 2020. Section 57.)</a></li></ul>