Division (a) F1

the operator may define groups of single-engined helicopter types and an operator proficiency check on one type will be valid for all the other types within the group if both the following conditions are met:

1. (1)

   the group includes either only single-engine turbine helicopters operated under VFR or only single-engine piston helicopters operated under VFR;

2. (2)

   for CAT operations, at least two operator proficiency checks per type are conducted within a 3-year cycle;