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Author	Message
Orlaam	Post subject: What's Going on Here?? Posted: Fri Nov 04, 2005 6:28 pm
Charter Member Joined: Fri Nov 04, 2005 1:00 am Posts: 102	Tracking N915DW ?? Thanks, Chris
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dbaker	Post subject: Posted: Fri Nov 04, 2005 6:47 pm
FlightAware Staff Joined: Mon Jul 25, 2005 12:00 am Posts: 1877 Location: FlightAware WHQ	Looks like a VFR flight, so it shows up on the area map but not for the ident since we don't know the origin or destination. The other indication of this is missing the aircraft type in the data block.
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Orlaam	Post subject: Posted: Fri Nov 04, 2005 8:12 pm
Charter Member Joined: Fri Nov 04, 2005 1:00 am Posts: 102	Okay, makes sense. Had me wondering. Oh well, nice site. Looking forward to any future enhancements.
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tobyz1	Post subject: Posted: Sun Nov 06, 2005 3:45 pm
Charter Member Joined: Fri Oct 28, 2005 10:00 am Posts: 976 Location: KADS	Someone might check the track of LXJ609 (KADS/KTUS). On the minute-to-minute position track from 206PM to 215PM, there are double and triple postings. The map shows an apparent flight track between Tucson and Buffalo area. As the topic says, "What's Going on Here?"
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mduell	Post subject: Posted: Sun Nov 06, 2005 4:49 pm
Joined: Wed Jul 27, 2005 3:00 pm Posts: 4715 Location: FAWHQ	tobyz1 wrote: Someone might check the track of LXJ609 (KADS/KTUS). On the minute-to-minute position track from 206PM to 215PM, there are double and triple postings. The map shows an apparent flight track between Tucson and Buffalo area. As the topic says, "What's Going on Here?" Sometimes we get erroneous returns from some radar sites. Often they're nearby (and the aircraft is just out of range), but sometimes they're very far away. In the case of that LearJet, one radar site was claiming the aircraft was at ~10000 feet over Arizona (correctly) while another radar site near New York was claiming the aircraft was at ~30000 feet (in error).
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tobyz1	Post subject: Posted: Sun Nov 06, 2005 5:37 pm
Charter Member Joined: Fri Oct 28, 2005 10:00 am Posts: 976 Location: KADS	Quote: In the case of that LearJet, one radar site was claiming the aircraft was at ~10000 feet over Arizona (correctly) while another radar site near New York was claiming the aircraft was at ~30000 feet (in error). I understand that faulty data input will typically result in faulty results output. However, can you help me understand how that New York radar site acquired erroneous data in the first place. Where did it come from?
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mduell	Post subject: Posted: Sun Nov 06, 2005 6:04 pm
Joined: Wed Jul 27, 2005 3:00 pm Posts: 4715 Location: FAWHQ	tobyz1 wrote: Quote: In the case of that LearJet, one radar site was claiming the aircraft was at ~10000 feet over Arizona (correctly) while another radar site near New York was claiming the aircraft was at ~30000 feet (in error). I understand that faulty data input will typically result in faulty results output. However, can you help me understand how that New York radar site acquired erroneous data in the first place. Where did it come from? Moving into the realm of unsupported speculation, it could have been confusion in the system due to someone in that area using the same transponder code, or some bizzare ionosphere reflection of the transponder signal, or aliens.
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tobyz1	Post subject: Posted: Sun Nov 06, 2005 6:13 pm
Charter Member Joined: Fri Oct 28, 2005 10:00 am Posts: 976 Location: KADS	Quote: .... or aliens. Aliens? I like that. An "undocumented" problem, of course!
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Orlaam	Post subject: Posted: Sun Nov 06, 2005 8:58 pm
Charter Member Joined: Fri Nov 04, 2005 1:00 am Posts: 102	By the way, how long is the delay of info? 15 minutes? 20? I saw a NWA flight track at a good distance north of the airport, but heard it on the scanner getting cleared to land. I know the routes very well, so it had some way to go before getting any clearance to land.
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mduell	Post subject: Posted: Sun Nov 06, 2005 9:06 pm
Joined: Wed Jul 27, 2005 3:00 pm Posts: 4715 Location: FAWHQ	Orlaam wrote: By the way, how long is the delay of info? 15 minutes? 20? I saw a NWA flight track at a good distance north of the airport, but heard it on the scanner getting cleared to land. I know the routes very well, so it had some way to go before getting any clearance to land. The delay is approximately 5 to 6 minutes.
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formulaben	Post subject: Posted: Mon Nov 07, 2005 8:56 pm
Charter Member Joined: Fri Nov 04, 2005 12:00 am Posts: 2 Location: Portland, OR	Could the same be expected if a flight cancels or activates a "present position via" IFR?
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dbaker	Post subject: Posted: Mon Nov 07, 2005 9:03 pm
FlightAware Staff Joined: Mon Jul 25, 2005 12:00 am Posts: 1877 Location: FlightAware WHQ	formulaben wrote: Could the same be expected if a flight cancels or activates a "present position via" IFR? No, those should be handled normally. See these FAQ questions: How does FlightAware handle pop-up IFR flights? What happens if an aircraft cancels an IFR flight plan en-route or prior to arrival?
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