Which term describes the lowest altitude at which an aircraft can be safely guided by radar?

• A. Minimum Vectoring Altitude
• B. Obstacle Clearance Altitude
• C. Flight Level Altitude
• D. Standard Pressure Altitude

Answer: (A)

The term that describes the lowest altitude at which an aircraft can be safely guided by radar is known as Minimum Vectoring Altitude (MVA). This altitude is specifically designed to ensure that an aircraft remains clear of terrain and obstacles while under the control of air traffic control (ATC). MVA is established in various airspaces to provide safety during radar vectoring operations and is crucial for maintaining safe separation between aircraft and the ground.

Minimum Vectoring Altitude is particularly important because it takes into account local terrain and obstacle data, ensuring pilots are aware of altitude limits that provide a buffer against potential hazards. This altitude is usually established at a level that significantly exceeds the height of known obstacles in the area, which plays a key role in the safety of instrument flight operations where visual references may be limited.

Other terms listed, such as Obstacle Clearance Altitude (OCA) and Flight Level Altitude, pertain to different aspects of aviation navigation and altitude management but do not specifically define the radar guidance context. OCA, while related to terrain clearance, is not exclusively used for radar operations, and Flight Level Altitude is a standardized altitude reference based on atmospheric pressure standards, rather than a minimum operational altitude under radar guidance.