Originally Posted by
amzhkm147
Is there any other reason apart from Robinson requirements?...
No. The OEM writes the inspection programs or ICAs so it falls to them what is required. While its not common you'll find other OEMs require similar flight checks before inspections or include routine daily checks in the inspection program. This is dated info but for example, the EC135 has a flight check form requirement for the 800 hour inspection interval. And at one time the AS350/355 included the before and after flight checks as part of their overall maintenance inspection program so while it wasn't a true flight check you did start the inspection with a supposed serviceable aircraft.