Questions tagged [squawk-codes]

The numerical codes broadcast by aircraft transponders which allow air traffic controllers to identify different aircraft.

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3answers
385 views

When is squawk 1000 assigned in USA?

From Are squawk codes used with ADS-B?: Yes, squawk codes are still used and required with ADS-B. The post is 3 years old though. And from Wikipedia List of transponder codes: 1000: Used ...
12
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6answers
30k views

What are all the squawk codes?

I love aviation and I love learning new things about it. I was wondering if anyone knew all of the squawk codes and in particular what squawk 7500 means.
1
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1answer
184 views

Are all IFR flights assigned squawk codes in US controlled airspace?

In the US, all IFR aircraft need a clearance to be in class A, B, C, D, and E airspace. Does this mean that all aircraft with clearances need to be assigned squawk codes by ATC when they enter?
18
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3answers
3k views

Why do the transponders introduce codes instead of using aircraft registration numbers?

(A non-pilot here, just a Aviation.SE reader, recently into listening to ATC. I am wondering...) Why do the transponders use their own codes? (squawk) It seems to me, it would be safer and less of a ...
4
votes
2answers
1k views

When may I change my transponder code to 1200 when being handled by ATC?

When am I allowed to change my transponder code to 1200? Is it after clearing the boundary of controlled "radio-contact-required with transponder" airspace?