Usage Spectrum
In the US, the military and the contractor cooperatively develop a usage spectrum for each aircraft. This spectrum is developed about a design gross weight, not the aircraft's actual gross weight. I believe the Blackhawk design weight is approximately 16800 lbs and the CH-53E was approximately 48,000 lbs. This developed usage spectrum includes operating scenarios about this weight, including time above it. A percentage of total flight operating time is assigned to each element of the spectrum. As an example:
5% - level cruise at best range
0.5% - Cruise at Vh
1% - 30° bank at best range cruise
These very detailed lists are then used to compute component lives for the aircraft. There are many instances where operational requirements change and the list has to be revisited and component lives are recalculated. The previously mentioned MH-60K is one example where the time spent at higher gross weights required a recalculation of the components lives for that specific model. I hope this helps. Maybe John Dixon can weigh in with more specifics on the Hawk.