All operations authorised by the PIFR are conducted
under the IFR to the same procedures and standards which
apply to other IFR aircraft conducting the same IFR operations.
For class A
As the system of maintenance will be assessed against the
requirements of the current edition of the manufacturer's
instructions, CARs and CAOs, it is advisable to use these
documents as guidance when developing the system.
Also a read of the CAsA Maintenance Guide For Owners/Operators clearly states for piston class B schedule 5 does not let you get away with less.
With class A CAsA certainly wont be going for anything different from the manufacturer (reputable one) states to do and when.
So on a King Air 200 the only extra thing that springs to mind between PVT and RPT and I might not even be correct is an extra hand held fire extinguisher in the cabin. Certainly the only added safety I can think of.