Piloto Posted June 6, 2016 Report Posted June 6, 2016 According to this FAA Flight Advisory https://www.faasafety.gov/files/notices/2016/Jun/CHLK_16-08_GPS_Flight_Advisory.pdf There will be interrupted GPS capability around a 400nm radius from LAX. So what happens to ADS-B traffic? It becomes invisible to the ADS-B ground stations and ADS-B airborne traffic sensors. But don't worry because the old fashion Mode A/C ATC radars and TCAS will still be able to locate traffic. As per FAA rule even after 2020 all aircraft will be required to have Mode A/C capability. All new ADS-B 1090Mhz transponders have Mode A/C capability. Mode A/C provides the greatest range for ATC radars. This is due to the high gain rotating directional antenna pointed at the traffic at the time of traffic reply. This provides a 20db gain or more vs a 3db gain for an ADS-B ground non-directional antenna. So what are the benefits of ADS-B.? José Quote
ArtVandelay Posted June 6, 2016 Report Posted June 6, 2016 Why don't you ask "So what are the benefits of GPS?" A one off event should not be used to judge the benefits of either. I've had ILS approaches down, should we eliminate ILS too? 1 Quote
Marauder Posted June 6, 2016 Report Posted June 6, 2016 According to this FAA Flight Advisory https://www.faasafety.gov/files/notices/2016/Jun/CHLK_16-08_GPS_Flight_Advisory.pdf There will be interrupted GPS capability around a 400nm radius from LAX. So what happens to ADS-B traffic? It becomes invisible to the ADS-B ground stations and ADS-B airborne traffic sensors. But don't worry because the old fashion Mode A/C ATC radars and TCAS will still be able to locate traffic. As per FAA rule even after 2020 all aircraft will be required to have Mode A/C capability. All new ADS-B 1090Mhz transponders have Mode A/C capability. Mode A/C provides the greatest range for ATC radars. This is due to the high gain rotating directional antenna pointed at the traffic at the time of traffic reply. This provides a 20db gain or more vs a 3db gain for an ADS-B ground non-directional antenna. So what are the benefits of ADS-B.? José I get an FAA rebate check of $500 when I install it this Fall? For me, ADS-B had been reliable once I hit 1,500'. For the first time since I bought the GDL-39, I lost ADS-B signal for a sustained period (half of the flight). Does make me wonder what their "backup" plan will be? Should I keep my Mode C just to be on the safe side? Sent from my iPad using Tapatalk Quote
Bob_Belville Posted June 6, 2016 Report Posted June 6, 2016 2 hours ago, teejayevans said: Why don't you ask "So what are the benefits of GPS?" A one off event should not be used to judge the benefits of either. I've had ILS approaches down, should we eliminate ILS too? Yeah, we flew into KGGG for DMax's party a couple of weeks ago. The long runway, 13/31, the one with the ILS was closed. We broke out at 400' on the GPS 36 approach. The only choice w/o GPS would have been the circle to land VOR-A with has a 495' AGL minimum. Quote
StevenL757 Posted June 11, 2016 Report Posted June 11, 2016 On June 6, 2016 at 4:05 PM, Piloto said: So what happens to ADS-B traffic? It becomes invisible to the ADS-B ground stations and ADS-B airborne traffic sensors. But don't worry because the old fashion Mode A/C ATC radars and TCAS will still be able to locate traffic. So what are the benefits of ADS-B.? José Exactly. One of the biggest reasons that, although I'm ADS-in and out-equipped now, my TCAS capability is far superior. Wouldn't trade it for anything. Quote
Bob_Belville Posted June 12, 2016 Report Posted June 12, 2016 21 hours ago, StevenL757 said: Exactly. One of the biggest reasons that, although I'm ADS-in and out-equipped now, my TCAS capability is far superior. Wouldn't trade it for anything. What TCAS equipment do you have? Quote
Bob_Belville Posted June 12, 2016 Report Posted June 12, 2016 1 minute ago, StevenL757 said: The NGT9000+ http://sarasotaavionics.com/avionics/lynx-ngt9000 And that is the equivalent of the TCAS units like the GTS855 TCAS that sells for over 20 AMUs? Quote
StevenL757 Posted June 12, 2016 Report Posted June 12, 2016 1 hour ago, Bob_Belville said: http://sarasotaavionics.com/avionics/lynx-ngt9000 And that is the equivalent of the TCAS units like the GTS855 TCAS that sells for over 20 AMUs? Good question. It is actually. I spoke with a couple of different L3 engineers during my panel planning. The 9000+ unit actually contains the computer used in the Skywatch899 HP system, so the 9000+ scans traffic up to 35 miles. Unless L3 updated their literature, that capability isn't clearly called out, so the majority of folks probably don't realize the added value. There are two antenna options - the NY156 or the NY164. Both are the same shape and appearance, but the 156 allows certifiication as a TCAS installation. The "TAS vs. TCAS" debate didn't really exist for me during planning, but when I had an opportunity to get ahold of a new-in-box, never-installed NY156 at a massive discount, I went that route. Had that not been the case, I couldn't have really justified the added cost, given the in-flight perceptions between certification types are transparent to the pilot. 1 Quote
gsengle Posted June 12, 2016 Report Posted June 12, 2016 I'll second that the 9000+ is an awesome box. And if you, like I, have skywatch active traffic, you can trade in that circuitry in your tail offsetting your cost, gain back some useful load, reuse the antenna, gain output power and get a new warranty. It's a great deal. Sent from my iPhone using Tapatalk Quote
StevenL757 Posted June 12, 2016 Report Posted June 12, 2016 Absolutely. (first flight is Wednesday this week...). :-) Quote
Bob_Belville Posted June 12, 2016 Report Posted June 12, 2016 4 hours ago, gsengle said: I'll second that the 9000+ is an awesome box. And if you, like I, have skywatch active traffic, you can trade in that circuitry in your tail offsetting your cost, gain back some useful load, reuse the antenna, gain output power and get a new warranty. It's a great deal. Sent from my iPhone using Tapatalk Is there some documentation that that technology displays traffic that I would not see with my GDL88/GTN750 set up? I know what I see but I have no way of knowing what I don't see. Quote
gsengle Posted June 12, 2016 Report Posted June 12, 2016 Of course it does. It actively interrogates/sees all transponder equipped traffic and locates them regardless of ads-b coverage or equippage. This is especially important in areas where coverage gets spotty at traffic pattern altitude. It's basically belt and suspenders... Basically it's TCAS integrated with ADS-B Sent from my iPhone using Tapatalk Quote
Bob_Belville Posted June 12, 2016 Report Posted June 12, 2016 57 minutes ago, gsengle said: Of course it does. It actively interrogates/sees all transponder equipped traffic and locates them regardless of ads-b coverage or equippage. This is especially important in areas where coverage gets spotty at traffic pattern altitude. It's basically belt and suspenders... Basically it's TCAS integrated with ADS-B ADS-B out/in is supposed show Mode C transponders as well as ADS-B equipped aircraft. I see traffic that has id info and traffic that does not. ??? Quote
gsengle Posted June 12, 2016 Report Posted June 12, 2016 Because that relies on the traffic showing up on ground based radar and being uplinked to you. That doesn't always happen. There are poor or no radar coverage areas, especially at low altitude. This system even works with no ADS-B signal at all. This is a thread about reliability after all, and I did say this was belt and suspenders. Sent from my iPhone using Tapatalk Quote
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