What are the vertical dimensions of Minimum Navigation Performance Specification Airspace (MNPSA)?

The correct choice identifies the vertical dimensions of Minimum Navigation Performance Specification Airspace (MNPSA) as flight levels 285 to 410. This airspace is specifically designed for aircraft that are required to meet certain navigation performance standards to operate safely within it.

Operating within these flight levels ensures that aircraft have a defined space that adequately supports the necessary separation and performance requirements. The specified range aligns with both international airspace regulations and the operational capabilities of aircraft that comply with the MNPS specifications.

This range is critical because it facilitates efficient traffic management and precise navigation in the higher altitudes where increased reliance on navigation systems occurs, thus ensuring safety in busy international flight corridors. Understanding these vertical boundaries helps pilots and air traffic controllers manage air traffic more effectively in this specialized airspace.