"I Follow Roads" of Knowledge to places and do stuff others miss out on .

IFR knowledge

4.75.28 Aircraft in a Common Frequency zone (CFZ)

1. Purpose
  • Non-mandatory airspace
  • Encourage pilots to use a single VHF frequency 
  • areas of concentrated aviation activity
2. On Visual Nav Chart
  • Blue diamond-shaped lines.
3. Operating in CFZ
  • Transmit position and intention
  • using published frequency
  • regular intervals  
  • Aircraft lights ON