Final answer:
To find airworthiness standards for normal, utility, and acrobatic category aircraft, mechanics should reference Federal Aviation Regulations, specifically Part 23, which contains certification and safety requirements.
Step-by-step explanation:
A mechanic can find the airworthiness standards for normal, utility, and acrobatic category aircraft in the Federal Aviation Regulations (FARs), particularly in Part 23. Part 23 establishes the certification requirements for the design and performance of these categories of aircraft, ensuring that they meet a baseline level of safety and reliability. It includes specifics on structural requirements, design and operational limitations, and other specifications relevant to achieving and maintaining airworthiness.