In radiotelephony, when reading back a clearance, which elements must be included?

• A. The exact values of altitudes, routes, and other critical items in the clearance.
• B. Only the route
• C. Only the altitude
• D. The clearance text ignored

Answer: (A)

When reading back a clearance, you reproduce every element that was issued, exactly as written, so the controller can verify you understood and will execute the correct instructions. This means repeating the precise altitudes, the route or flight path, and any other item that affects how the clearance is carried out.

Including all the specified items matters because even a small omission can lead to misinterpretation or an unsafe deviation. For example, if the clearance calls for a particular altitude and a specific route, both pieces must be repeated back to confirm you’ve captured the full instruction and aren’t just recalling part of it.

Reading back only the route would miss the altitude, which could place you at the wrong level. Reading back only the altitude would miss the route guidance. Ignoring the clearance is not acceptable and defeats the purpose of the readback.

So the best practice is to state the entire clearance exactly as issued, including all altitudes, routes, and other critical items.