SAS;
As part of current congested area operations where Class 1 can't be assured we as operators are required to provide the data as part of our risk assessments. For the 135 we can guarantee Class 1 all the time, the S76 has a problem with Battersea as the FATO is too small for S76 Class 1. Sikorsky collate the information continually and provide it to us on request, the data is based around the helicopter/engine combination and is very detailed. Certainly it means we can mitigate the risk right down to an insignificant level.
SND