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Old 26th Jan 2015, 11:58
  #8 (permalink)  
Join Date: Feb 2004
Location: Australia
Posts: 1,300
A320 series walkaround

I see the A320 has two ATC antennas on the roof as well.

Generally, to interact with TCAS, each ATC system needs an upper and lower antenna. The A320 evidently has 4 ATC antennas (two for each ATC system).
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