Under what condition must non-precision approaches be flown using the Continuous Descent Final Approach technique?

The correct answer highlights the importance of regulatory guidance in flying non-precision approaches using the Continuous Descent Final Approach (CDFA) technique. Aviation authorities have specific standards and practices that pilots and operators must follow to ensure safety and reliability during non-precision approaches.

Typically, the use of CDFA may be encouraged or required under certain circumstances to improve safety and efficiency, particularly in reducing operational errors and minimizing the risk of potential hazards during the approach phase of flight. If an aviation authority allows an alternative method or technique, then deviations from standard procedures may be permissible.

The condition that the authority must approve other methods underscores the significance of adhering to regulations established by relevant aviation bodies, such as the FAA in the United States or equivalent agencies in other countries. This highlights the principle that safety protocols are paramount and that any variances must be authorized to ensure that the aircraft operations remain within acceptable safety margins.

The other conditions, such as the necessity of autopilot, restrictions to certain airports, or limitations for specific categories of aircraft, do not influence the broader regulatory requirement that governs approach techniques and strategies. The authority's approval remains the critical aspect ensuring operational safety standards are met.