BIK_116.80, regarding your statement "I know of a scheduled freight charter pilot who used to fly four or five days on freight ops during the week and then go and fly a twin-engined turbine aircraft on parachuting flights on Saturday and Sunday". .As ozoilfield stated, your friend can fly to his heart's content on private operations AFTER his commercial flying. But, if his operator is on the standard Australian CAO 48, BEFORE he commences his commercial flying he must satisfy the rest of the CAO 48. I.e. Max 90 hours duty time in last fortnight. Max. 30 hours flight time in last 7 days. Max. 100 hours flight time in last 30 days. Max. 900 hours flight time in last 365 days. As per CAO 48.0.1.3 that must include ALL PRIVATE FLYING. If his operator has excemptions or operates on a fatigue management system then those limits apply and again private operations are counted. I'm not surprised that CASA has given him a hard time. Perhaps he uses one of these pens where the ink fades quickly.