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Because I am a stickler..."tracking" = transponder. They do not turn off their transponder unless they exit Bravo airspace; even in restricted airspace. They more than likely squak an alternate beacon code (for ATCRBS) and use an alternate MODES transponder (unlisted) once they enter the range's controlled airspace.
Originally posted by gariac
Because I am a stickler, tracking means radar. You can be tracked on radar without a transponder. Without a transponder, the plane is a blip on the screen with no ID and worse of all, no altitude.
What we don't know is exactly how the LA Center feed is terminated on the internet tracking websites. That is, do they filter it by coordinates or beacon code. I suspect it is by beacon code.
The flights start out with a Janet callsign from McCarran. At some point, there is a hand-off to Groom Lake approach/departure. The callsign is changed to the "callsign of the month" and the beacon code is also changed. The new squawk codes are of the format 03xx.
The ASDI data is NOT radar data. Aircraft radar positions are transmitted from ATC radar facilities around the country to the TFM hub site where they are displayed and/or updated on the ASD display used by FAA air traffic flow managers. Because of communications and data processing loads, only a subset of the radar positions from each radar facility are updated during each update cycle. Those flights that are not updated are extrapolated along their last heading, speed, and route until their next update is transmitted. Currently, the radar position for any particular flight is updated every four (4) minutes.
The reliability of the ASDI data steam is the same as it is for the FAA Air Traffic Control System Command Center (ATCSCC). The data source is the operational TFM system (with certain data filtered out as mentioned above) and is provided with no time lag. However, it should be noted that the ASDI data is provided “as is” with no special provisions built in for public release.
Originally posted by rayktheon
I have seen in FlighAware that certain flights with "KTNX" designation are directed to the Tonopah Test Range Range Airport, but is this true? That is, the flights whose flight path is the Tonopah Test Range using "KTNX" designation or "TNX" code, while those heading to Groom Lake are listed as "KXTA"?
The question I have is if both the TTR as Groom are secret ubications how is possible that they publish their identification with ICAO codes flight records?
edit on 29-6-2013 by rayktheon because: (no reason given)