Ottawa Airside Vehicle Operator's Program (AVOP) Practice Test

When radio communication fails, the important safety principle is to switch to visible, universal guidance so aircraft and ground vehicles can still move safely. Using standard hand signals and safe signals provides clear, unambiguous instructions that pilots and drivers are trained to understand. Keeping you in the line of sight to the aircraft or driver is crucial because you must be able to see their responses and adjust your signals or actions accordingly to avoid miscommunication or collisions.

Also, attempting to contact ATC by any other available means helps you re-establish coordination as quickly as possible. Even without radios, ATC can guide you through alternate communication channels or ground procedures, and you’re still responsible for directing traffic safely until contact is reestablished.

In short, non-verbal signals plus continued visibility and alternate contact methods maintain control and safety in the Movement Area when radio fails.