Which indicator should be used to show an aircraft is on frequency?

Which indicator should be used to show an aircraft is on frequency?

• A. Data block color
• B. Voice Communication Indicator in the bookkeeping box
• C. Remarks field
• D. SPA tag

Answer: (B)

The main idea here is tracking real-time voice contact with the aircraft. The Voice Communication Indicator in the bookkeeping box directly shows whether you are on frequency with that aircraft, signaling active radio contact. This makes it the most reliable and immediate cue that you are communicating with the flight, which is essential for coordinating instructions and ensuring correct sequencing. Other items don’t reflect ongoing voice status in the same way. Data block color may indicate different data or alert states but not whether you’re currently speaking with the aircraft. The remarks field is just for notes and isn’t an active status signal. The SPA tag is a labeling or special handling indicator, not a live on-frequency indicator.

The main idea here is tracking real-time voice contact with the aircraft. The Voice Communication Indicator in the bookkeeping box directly shows whether you are on frequency with that aircraft, signaling active radio contact. This makes it the most reliable and immediate cue that you are communicating with the flight, which is essential for coordinating instructions and ensuring correct sequencing.

Other items don’t reflect ongoing voice status in the same way. Data block color may indicate different data or alert states but not whether you’re currently speaking with the aircraft. The remarks field is just for notes and isn’t an active status signal. The SPA tag is a labeling or special handling indicator, not a live on-frequency indicator.