Extract from the CASA website:
"General competency requirement
What is the general competency rule?
Every pilot must abide by the general competency requirement, which is covered in Civil Aviation Safety Regulation 61.385. This regulation means that you are responsible for ensuring you are competent to fly a particular aircraft and conduct a particular kind of operation, even if you hold the necessary authorisations. That includes being competent in:
- operating the aircraft's navigation and operating systems
- conducting all normal, abnormal and emergency flight procedures for the aircraft
- applying operating limitations
- weight and balance requirements
- applying aircraft performance data, including take-off and landing performance data, for the aircraft.
Pilots should consider undertaking training from a qualified person before flying a type of aircraft they have not previously flown, even if they hold the relevant class or type rating.
Always apply prudent airmanship before flying an aircraft you are not familiar with or haven't conducted a kind of operation recently."