Which statement regarding Required Navigation Performance (RNP) is true?

Required Navigation Performance (RNP) is a crucial concept in modern aviation, especially under the framework of Performance-Based Navigation (PBN). The concept emphasizes the need for specific operational capabilities within a defined set of requirements to ensure safety and efficiency in aircraft navigation.

All the listed statements pertain to the regulatory and operational aspects necessary for RNP operations. Aircrews must indeed undergo comprehensive training and certification to operate within RNP airspace because these standards ensure that pilots are equipped with the skills and knowledge to use RNP procedures safely. Compliance with these training requirements is essential to maintain a high level of safety and operational integrity.

Furthermore, operational approval is critical for any navigation equipment used by aircraft. It ensures that the equipment meets the stringent accuracy and performance requirements dictated for RNAV systems. This is necessary to maintain the reliability of navigation and comply with air traffic management protocols.

Lastly, approval from Major Commands (MAJCOMs) is required for each RNP procedure, ensuring that every procedural aspect has been reviewed and meets the necessary standards for safe operations. This ensures that the aircraft and crew can indeed perform navigation services that comply with the expected RNP specifications effectively.

In summary, the correctness of the chosen response lies in the comprehensive nature of RNP operations