What must the NPS or any other agency do regarding operations that affect navigable airspace?

The correct answer emphasizes that any agency, including the National Park Service (NPS), must get regulations approved by the Federal Aviation Administration (FAA) when their operations affect navigable airspace. This is crucial because the FAA has the jurisdiction to ensure safe and efficient use of the airspace. The agency is responsible for regulating aviation safety, managing air traffic, and ensuring that any developments or changes in operations do not interfere with current air traffic or aviation activities.

When the NPS or similar entities plan projects that could impact navigable airspace, they must coordinate with the FAA to ensure compliance with federal aviation regulations. This may involve submitting notices, undergoing reviews, and potentially modifying plans based on FAA feedback to maintain safe air traffic operations.

In this context, other actions such as requesting permission from state authorities, conducting environmental assessments, or drafting internal guidelines are important but do not fulfill the specific requirement related to the navigable airspace, which mainly falls under the jurisdiction of the FAA. Therefore, obtaining FAA approval for regulations is a fundamental requirement in this scenario.