Which statement is true regarding documents that must be on the aircraft?

• A. They are optional
• B. Defined by operator
• C. Defined by CASR Part 43
• D. CASR Part 45 defines them

Answer: (D)

The need for certain papers to be carried on board is set by the regulations themselves, not by operator preference. These documents are defined to ensure quick verification of airworthiness and identity during flight checks.

The correct statement is that CASR Part 45 defines which documents must be on the aircraft. Part 45 specifies the on-board documents (such as the airworthiness certificate, the registration certificate, and any other required items for the particular aircraft and operation) so there’s a standard requirement across operators. This isn’t optional, and it isn’t defined by Part 43, which relates to maintenance and related records rather than the list of documents to carry.