If outbound squawk is 0100, what is the inbound squawk?

If outbound squawk is 0100, what is the inbound squawk?

• A. 0100
• B. 0400
• C. 0300
• D. 0200

Answer: (B)

In this scenario, the code used for radar identification follows a pairing convention: the outbound code and the inbound code share the same digits except the second digit, which changes to indicate direction. When the outbound squawk is 0100, the inbound squawk uses 0400 to show the aircraft is returning inbound under the same identification. The first, third, and fourth digits stay the same; only the second digit changes from 1 to 4 to mark the inbound direction. That’s why the inbound squawk is 0400. The other options don’t fit this pairing rule: repeating 0100 would not indicate inbound, and the codes 0300 or 0200 don’t align with the established outbound/inbound pairing used in this question’s context.

In this scenario, the code used for radar identification follows a pairing convention: the outbound code and the inbound code share the same digits except the second digit, which changes to indicate direction. When the outbound squawk is 0100, the inbound squawk uses 0400 to show the aircraft is returning inbound under the same identification. The first, third, and fourth digits stay the same; only the second digit changes from 1 to 4 to mark the inbound direction. That’s why the inbound squawk is 0400.

The other options don’t fit this pairing rule: repeating 0100 would not indicate inbound, and the codes 0300 or 0200 don’t align with the established outbound/inbound pairing used in this question’s context.