Equalised Checks.
You can split any aircraft maintenance check package into equalised checks as long as you use the manufacturer's maintenance planning document as the starting point. The key lies in maintaining the required hours/cycles/time intervals between individual inspection and servicing items. There is nothing new about equalised checks. The process was certainly in our apprenticeship syllabus forty years ago.
After the operator's maintenance plan is approved by the regulators to become the operator's Approved Maintenance Programme (AMP), the intervals between and contents of the equalised packages may be adjusted through the reliability programme. There isn't a D check for B757 or B767 aircraft - the 36,000 hour C12 check being an equivalent. I expect that is the case for at least the later model B747s as well, since they were also constructed to MSG3.
The Corrosion Prevention and Control Programme (CPCP) also runs in parallel with the equalised check packs and may therefore be equalised as well.
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Through difficulties to the cinema