According to 14 CFR Part 27, small rotorcraft must adhere to which standard?

The correct choice aligns with the intent of 14 CFR Part 27, which is dedicated to airworthiness standards for small rotorcraft. These regulations are designed to ensure that rotorcraft meet specific safety and performance criteria before they can be operated in commercial or private capacities.

Part 27 sets forth detailed requirements regarding various aspects of rotorcraft design and operation, including structural integrity, performance in emergency situations, and compatibility with operational environments. By adhering to airworthiness standards, manufacturers and operators can ensure that the aircraft is safe and suitable for flight, reducing the risk of accidents and malfunctions.

In contrast, while normal operation procedures and environmental standards are essential components of aviation safety and compliance, they do not specifically address the design and manufacturing specifications that guarantee the basic airworthiness of the rotorcraft. Performance specifications are also relevant, but they are a part of the broader airworthiness standards specified in Part 27. Thus, airworthiness standards come first in terms of regulatory compliance for ensuring that small rotorcraft are fit for operation.