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When since I first heard about how anal some people get about the "with you" stuff, I immediately started using it all the time just to get them more upset.
Depends on the counrty.Above FL180? No visual separation allowed up there.
Sometimes when we get a new code, we'll turn off the xpdr, change the code, and then turn it back on. This is to avoid scrolling through some other code that's already assigned, or any special use codes. Recently somebody told me ATC doesn't like it when we turn off the xpdr, even momentarily. Do you guys care one way or the other?
e. Code Changes
1. When making routine code changes, pilots should avoid inadvertent selection of Codes 7500, 7600 or 7700 thereby causing momentary false alarms at automated ground facilities. For example, when switching from Code 2700 to Code 7200, switch first to 2200 then to 7200, NOT to 7700 and then 7200. This procedure applies to nondiscrete Code 7500 and all discrete codes in the 7600 and 7700 series (i.e., 7600-7677, 7700-7777) which will trigger special indicators in automated facilities. Only nondiscrete Code 7500 will be decoded as the hijack code.
2. Under no circumstances should a pilot of a civil aircraft operate the transponder on Code 7777. This code is reserved for military interceptor operations.
3. Military pilots operating VFR or IFR within restricted/warning areas should adjust their transponders to Code 4000 unless another code has been assigned by ATC.