What transponder code indicates unlawful interference?

What transponder code indicates unlawful interference?

• A. 7500
• B. 7600
• C. 7700
• D. 0000

Answer: (A)

Transponder codes are four-digit squawks that pilots set to convey specific situations to air traffic control. The code for unlawful interference is the hijack code, and when ATC sees this squawk, they immediately activate hijack procedures, give the aircraft priority, route traffic to safety, and alert authorities to handle the security threat. This direct signaling is why it’s the correct choice: it communicates a clear, urgent security situation that requires immediate, coordinated action. The other common codes indicate different conditions: one signals loss of radio communications, prompting ATC to try to reestablish contact and if needed proceed with contingency procedures; another indicates a general emergency, which also commands priority handling but for a broader range of emergency situations. The remaining code is not used to signal hijacking, so it would not convey unlawful interference to ATC.

Transponder codes are four-digit squawks that pilots set to convey specific situations to air traffic control. The code for unlawful interference is the hijack code, and when ATC sees this squawk, they immediately activate hijack procedures, give the aircraft priority, route traffic to safety, and alert authorities to handle the security threat. This direct signaling is why it’s the correct choice: it communicates a clear, urgent security situation that requires immediate, coordinated action.

The other common codes indicate different conditions: one signals loss of radio communications, prompting ATC to try to reestablish contact and if needed proceed with contingency procedures; another indicates a general emergency, which also commands priority handling but for a broader range of emergency situations. The remaining code is not used to signal hijacking, so it would not convey unlawful interference to ATC.