When making routine transponder code changes, pilots should avoid inadvertent selection of code. 7700.
Under normal as well as non-emergency operations, it is very essential for pilot to make sure he avoid using the transponder codes of 7500, as well as 7600, and 7700.
Especially while switching codes, It is easy in switching by pilot to go to of these 3 codes on accident.
In this case, When making routine transponder code changes, pilots should avoid inadvertent selection of code. 7700.
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