PPRuNe Forums - View Single Post - Operational use of Primary and Secondary Channel

31st May 2020 | 11:15

#6 (permalink)

excrab

Joined: Jun 2001

Posts: 591

Likes: 36

From: The middle

Also in many parts of the world box 2 is needed for inflight broadcast procedures and negotiating entry at FIR boundaries, so ATC functions in addition to monitoring guard and house keeping stuff.

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