During flight patterns, which VHF channels are used in pattern and outside pattern?

• A. In pattern: RSU (VHF 2); Outside pattern: SOF (VHF 12)
• B. In pattern: SOF (VHF 12); Outside: RSU (VHF 2)
• C. In pattern: IP (VHF 4); Outside: Ops Sup (VHF 20)
• D. In pattern: Ops Sup (VHF 20); Outside: IP (VHF 3)

Answer: (A)

Pattern operations require a dedicated frequency separate from outside-pattern communication to keep circuit traffic orderly. Inside the pattern, you need quick, frequent updates on spacing and sequencing, so using RSU on VHF 2 provides direct access to the pattern controller/facility. Outside the pattern, pilots should use the outside-pattern channel (SOF on VHF 12) for general airspace coordination, avoiding clutter in the circuit. The other arrangements place the wrong service on the pattern or outside frequencies, which would cause confusion and reduce the efficiency and safety of pattern operations.