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ADS-B Aircraft Blacklist
Stemming from another conversation around spurious ADS-B spikes; for those interested, I have been manning a blacklist of aircraft who are notorious for transmitting incorrect position reports.
These are only aircraft that have been operating in, out, or around YSSY. Here is the unfortunate list of repeat offenders I have personally recorded over the past year: 7C4366 //Nauru Air Corporation 737-33A VH-NLK 7C1473 //Qantas Airways A-330-202 VH-EBP 7C6C6F //V Australia Boeing 777-3GZER VH-VPD C81C17 //Pacific Blue Airlines 737-8FE ZK-PBK E8023F //LAN Chile A-340-313X CC-CQF 7C6C71 //V Australia Boeing 777-3GZER VH-VPF C817CC //Pacific Blue Airlines 737-8FE/W ZK-PBD E8023E //LAN Chile A-340-313X CC-CQE You might have your own list, or may have an update to mine. If you've noticed an improvement on any of the above aircraft, please let me know and I'll remove them. I guess the only real way of knowing if any of these aircraft above still offend is for me to clear my plot's blacklist and compare the plot over time once again. DaveReid puts it nicely: Quote:
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Naughty aircraft!
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I am always hungry for a DoG Steak! :-) |
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ADS-B "Blacklist"
Karl,
As you would expect, Airservices monitors ADS-B performance and carries out various checks before it uses ADS-B for air traffic control. With respect to the aircraft on your "Blacklist", they fall into several groups 7C6C6F //V Australia Boeing 777-3GZER VH-VPD 7C6C71 //V Australia Boeing 777-3GZER VH-VPF C81C17 //Pacific Blue Airlines 737-8FE ZK-PBK C817CC //Pacific Blue Airlines 737-8FE/W ZK-PBD This group were all equipped with a version of a Mode S / ADS-B transponder that had a fault. This fault has now been fixed, so you can remove them from your blacklist. E8023F //LAN Chile A-340-313X CC-CQF E8023E //LAN Chile A-340-313X CC-CQE These two aircraft are fitted with an old GPS transponder that does not meet CASA's requirements for an ADS-B data source. They should be upgraded before the flight level 290 and above ADS-b mandate comes into force in December 2012. 7C4366 //Nauru Air Corporation 737-33A VH-NLK The standard ADS-B message from an aircraft includes information about the accuracy and integrity of the data source. This information is ignored by boxes like the SBS-1, but is critical for determining if the data is suitable for air traffic control. Transmissions from this aircraft indicate low accuracy / integrity, so it never gets through to the ATC system. The data source is probably an inertial nav system rather than GPS. Again, it needs to be upgraded before Dec 2013. 7C1473 //Qantas Airways A-330-202 VH-EBP No problems have been observed with this aircraft. The only suggestion I can think of is that the observed anomaly might have been attributable to the position decoding method used. To unambigously determine an ADS-B position it is necessary to use "global CPR decoding", which requires processing of two separate ADS-B messages, referred to as "odd" and "even" message types. Some processing software uses "local decoding" with only one message, which sometimes produces anomalous results. Suggest you remove this one from your blacklist. Regards Bob. |
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We can go with Karl, lol.
Hi Bob, Thanks for updating us with the latest information regarding the "blacklist". This is great news and your update is very much appreciated. So currently the maintained list looks like this: Quote:
Are there others we might need to be aware of presently? Also, might you have any intel on the latest one that Grahame recorded as incorrectly reporting it's position? Quote:
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Bob's maiden post is very helpful!
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Philip |
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Haha, Philip, i was thus the at the end
On a similar, but slight different issue, 5/8/12 I was on the following flight Quote:
Now this was a QF flight, yet it had the TN details, puzzeled much!! |
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Bernie, The old TJ series B737s all transmit the TN flight ID. Don't think they bothered changing it changed when Australian was merged into Qantas way back.
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Joined 1999 @www16Right FlightDiary Airliners Web QR Retired PPL C150/172 PA28-161/181 Pitts S-2B SIM: 12Hr QF B767 B744 CX B742 Nikon D100-D200-D300-D500 |
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Black list - KAL 777s
Kurt,
Apologies for converting Kurt to Karl in yesterday's post - at least I got two of the four letters right. Regarding the question about Korean Air Boeing 777-2B5 reg HL7752777, address 71BF52, at present we have all the KAL 777s marked as suspect because they have the same faulty transponder as the Virgin aircraft had. The list includes KAL aircraft with the following addresses 71BD31 71BD32 71BD33 71BD34 71BD73 71BD74 71BD75 71BD98 71BF14 71BF15 71BF33 71BF34 71BF50 71BF51 71BF52 71BF64 71BF65 71BF66 71BF82 71BF83 71BF84 71C208 71C209 71C210 71C222 Sorry to add so many new entries to your blacklist. Regards Bob. |
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Thanks Bob,
Thanks for the information. I have updated my list with the KAL entries. The latest offender was this morning's LAN aircraft, who was seen well over the drink between Perth and South Africa: Quote:
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