Final answer:
CASR 61.860 is a regulation regarding the limitations of an instrument rating for pilots, outlining the conditions under which the rating is valid and including requirements like recent experience and applicable aircraft types.
Step-by-step explanation:
CASR 61.860 refers to a regulation within the Civil Aviation Safety Regulations in Australia that pertains to the limitations of an instrument rating for pilots. This regulation is part of aviation rules that govern the conditions under which a pilot who holds an instrument rating can operate. The instrument rating is a qualification that allows a pilot to fly according to Instrument Flight Rules (IFR), which is essential for flying in diverse weather conditions and at times when visual flying is not safe or not permitted.
Accordingly, CASR 61.860 would specify the circumstances and limitations under which the pilot's instrument rating is valid. These could include but are not limited to currency requirements, such as the need for recent experience, limitations on the types of aircraft the rating applies to, and any endorsements or additional training that may be required for certain flight conditions or navigation systems.