What is the first step for pilots when they want to verify assigned altitude?

When pilots want to verify their assigned altitude, the most appropriate first step is to request confirmation from air traffic control. This is because air traffic control (ATC) has real-time access to flight data and is responsible for ensuring the safe separation and guidance of aircraft in the airspace. By communicating directly with ATC, pilots can obtain the most accurate and current information regarding their altitude assignments.

This process is crucial for maintaining safety and compliance with air traffic procedures, as altitude discrepancies can lead to dangerous situations involving potential collisions or airspace violations. By confirming with ATC, pilots ensure they are adhering to their assigned flight plan and adjusting as necessary based on instructions from air traffic controllers.

Other methods, such as contacting the nearest airport, checking the flight manual, or replying with current airspeed, do not provide the specific verification needed regarding assigned altitudes and are not standard protocols for altitude verification. These options do not directly address the pilot's need for clarity on altitude assignments from the controlling authority, which is ATC.