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Actually it comes from the alarm requirements of a Category I ILS. The
ground equipment is supposed to detect an out-of tolerance condition from
the radiated signal and shut it off within six seconds.

The flag requirements for WAAS enroute and non-precision approach are 30 and
10 seconds (I think) respectively.
"Larry Dighera" wrote in message
news:bZaq5.12649$6T.1365196@typhoon.we.rr.com...
> On Sun, 27 Aug 2000 15:50:10 GMT, caf@omen.omen.com (Chuck Forsberg
> WA7KGX) wrote:
>
> [...]
>
> >As I understand, the outstanding issue with WAAS is proving
> >that the system will flag an error within 6 seconds.
> >Somebody figured six seconds of bum steer isnt enough to
> >put us into cumulogranite.
>
> The interval between TRACON radar sweeps it about 6 seconds. Perhaps
> that is the source of that parameter.
>
>

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