Gullibell, the design structure is old, the helideck is D22, has restrictions due to exhausts, trialled by Petrobras and HCA using a S92 and HFDM to study conditions. The customer demands crews not to depart without rig status report less that 1 hour old. Radio Operators are required to faithfully report PRH using calibrate means - and have been fired for failing to do so. There are extreme weather conditions triggered by wind speed but this does not account for turbulence / down-draught during landing. We are a little more advanced than earlier posts here might infer.