MaxNg,
Unfortunately, you are not correct. In the UK prior to JAR-FCL, it was a requirement for commercial pilots that S/E base checks included an EOL at 90% MAUW. this has been deleted from the requirements under JAR-FCL (the 90% bit that is). This is one of a number of retrograde steps, resulting from a committee of civil servants writing the requirements and not helicopter pilots. Some TREs still use 90% but it is not a requirement anymore which is a shame.