It really depends upon the Authority - although some States adhere to the static and dynamic stress loads provided in Section 1.3.2 "Structural Design" of the ICAO Heliport Manual (Doc 9261), not all do. This will condition the loading data that has been established.
For example: most of the older North Sea platforms were built for the S61 (using this method) but, following a safety study (comparing the likely 'dymamic' loading following an engine failure on approach or departure), they were subsequently approved for use by the EH101 (and others).
Practically speaking, there is nothing wrong with landing a helicopter with a landing mass of 6t on a deck that has been approved for that mass. Perhaps more importantly, is the D size sufficient for that type of helicopter?
The responsibility for offshore operations and, in particular, whether a deck is suitable for the type of helicopter being used, rests with the Operator. Each deck should be authorised by the Operator as part of the safety program (SMS). An individual pilot should not be in the position where he has to make such a determination.
Jim
Last edited by JimL; 3rd Nov 2011 at 09:45.
Reason: Punctuation