Transponder check

On Sunday, June 9, 2019 at 6:56:53 AM UTC-7, wrote:
Yesterday the company I work for had a problem with many aircraft (hundreds) that had ADSB recently installed. There was an unusual amount of solar activity that knocked out the ADSB and as a consequence the transponder too.. I dont know the details but it was only a problem for one aircraft type in the fleet. My point here is that in some equipment/instalation combinations solar activity will effect reliability of these systems.

It will be interesting to understand what is going on there, multiple reports on twitter and elsewhere of CRJ and some Boeing aircraft having issues.

It should take a very large solar flare to affect GPS reception. With a few quick searches I don’t see reports of large solar flares or geomagnetic storms. Where is John Leibacher when you need him? :-)

An ADS-B GPS receiver problem should not ever “knock-out� a transponder. It may prevent the transponder transmitting ADS-B position data, but the device should keep working as a transponder. If it is then... wholly ASB and AD Batman.

I am curious if all those aircraft have Rockwell Collins receivers like GLU-925/GLU-2100 series?

On Sunday, June 9, 2019 at 10:16:44 AM UTC-7, Darryl Ramm wrote:
On Sunday, June 9, 2019 at 6:56:53 AM UTC-7, wrote:
Yesterday the company I work for had a problem with many aircraft (hundreds) that had ADSB recently installed. There was an unusual amount of solar activity that knocked out the ADSB and as a consequence the transponder too. I dont know the details but it was only a problem for one aircraft type in the fleet. My point here is that in some equipment/instalation combinations solar activity will effect reliability of these systems.

It will be interesting to understand what is going on there, multiple reports on twitter and elsewhere of CRJ and some Boeing aircraft having issues..

It should take a very large solar flare to affect GPS reception. With a few quick searches I don’t see reports of large solar flares or geomagnetic storms. Where is John Leibacher when you need him? :-)

An ADS-B GPS receiver problem should not ever “knock-out� a transponder. It may prevent the transponder transmitting ADS-B position data, but the device should keep working as a transponder. If it is then... wholly ASB and AD Batman.

I am curious if all those aircraft have Rockwell Collins receivers like GLU-925/GLU-2100 series?

....and the FAA is officially fingering Rockwell Collins. I'll wager good money this is nothing to do with solar activity, and wager less money that somebody gooched some software... the same company that cannot get GPS epoch rollover done properly.

https://www.fly.faa.gov/adv/adv_othe...eDate=06/09/19

On Sunday, June 9, 2019 at 1:16:44 PM UTC-4, Darryl Ramm wrote:
Where is John Leibacher when you need him? :-)

Paris, at least a few weeks ago last I heard from him,
still GONGing I presume...
And he *still* makes time to keep up databases for everyone,
Thanks John!