What is the significance of the number and degree symbol associated with the black arrow on airport diagrams?

The black arrow on airport diagrams plays an important role in navigation and air traffic management by indicating variation in obstacle height. The number and degree symbols next to the arrow provide vital information about the elevation of obstacles relative to the airport’s elevation and are crucial for safe maneuvering around an airfield.

Pilots use this information to understand the potential risks posed by obstacles, such as trees, buildings, or terrain, which may affect approaches, departures, and operational procedures. Having clear visibility on obstacle heights ensures that pilots maintain safe altitudes during critical phases of flight, particularly when navigating in cluttered or uneven environments around an airport.

The importance of this information cannot be overstated, as it directly contributes to situational awareness and pilot decision-making during flight operations. It supports compliance with safety regulations and best practices in aviation, ensuring that pilots are well-informed about their surroundings and able to execute their maneuvers safely.