ADSB - B Fail

[TGreen]

Intermittent ADS-B failure in flight today. I couldn't see traffic but ATC said they were picking up my ADSB signal just fine. Any ideas?

 

[toto]

It sounds like it might be a connection issue between your G1000 and the ADS-B transmitter? I’d go do a validation flight (or just use this one) and check via the FAA site:

https://adsbperformance.faa.gov/paprrequest.aspx

[hammdo]

Did you check the notams for ADS-B outages? I see several NOTAMS about intermittent outages… May need to see if your area had them also…

-Don

[toto]

10 minutes ago, hammdo said:

Did you check the notams for ADS-B outages? I see several NOTAMS about intermittent outages… May need to see if your area had them also…

-Don

Oh that’s a good idea. Does the G1000 manual give information about the error message? If you know for sure that it’s a reception issue (or that it’s a connectivity issue), you could certainly narrow things down. 

[Marc_B]

Agree...do a FAA performance report and see what that pulls up.  According to Garmin, the most common cause of intermittent ADS-b failure is terrain and antenna masking.

 

Check your maintenance manual for troubleshooting information.  But if you can't find info, this info may be somewhat applicable...from GTX transponder manual.  For the intermittent issue they point to antenna, coax, ground plane.  Big question is if you've changed anything recently and where is your antenna?  Any chance of damage?

[PT20J]

This appears to be a message indicating that your ADS-B in device is no longer communicating with the G1000.

[TGreen]

7 hours ago, PT20J said:

This appears to be a message indicating that your ADS-B in device is no longer communicating with the G1000.

Thanks. That sounds right. Shot in the dark here: Does the 345-R talk to the G1000 via Bluetooth? I had a tablet and phone with me. I have recently been trying to pair both of them with the 345-R (so I could see traffic/weather on my Electronic Flight Bag). Could they have been trying to auto-pair with the 345-R and messing up it's connection with the G1000?

[PT20J]

56 minutes ago, TGreen said:

Thanks. That sounds right. Shot in the dark here: Does the 345-R talk to the G1000 via Bluetooth? I had a tablet and phone with me. I have recently been trying to pair both of them with the 345-R (so I could see traffic/weather on my Electronic Flight Bag). Could they have been trying to auto-pair with the 345-R and messing up it's connection with the G1000?

I don’t believe the G1000 had Bluetooth. But even if it did, I would expect a hardwire connection since this is a factory installation. Bluetooth connections to the 345R can be problematic because the bulkhead in the rear of the baggage compartment shields the signal. 

[Ragsf15e]

1 hour ago, TGreen said:

Thanks. That sounds right. Shot in the dark here: Does the 345-R talk to the G1000 via Bluetooth? I had a tablet and phone with me. I have recently been trying to pair both of them with the 345-R (so I could see traffic/weather on my Electronic Flight Bag). Could they have been trying to auto-pair with the 345-R and messing up it's connection with the G1000?

I fly a different airplane with a g1000 and gtx345-r.  @PT20J is correct, the transponder is hard wired to the g1000.  The bt is from the gtx for adsb for an ipad, although there are several settings that can be changed on the gtx via bt if you’re using garmin pilot.  They mostly concern the Bluetooth link (name, auto connect, etc).  
The PAPR report is a good place to start.  Also, look at your ipad (connected of course) when you see the error and see if the ipad still has good adsb data. Ive had the g1000 cause issues before and the ipad still be perfect with the bt link.  Next flight it was fine…

[TGreen]

Thanks. Everything seems fine today. Go figure.

[Marc_B]

@TGreen I’d still run a performance report off the flight you had issues to see what it shows. Might help in future if issues reoccur. 

[TGreen]

PAPR_20250618_A577A6_591221165.pdf

Think this means it was transmitting fine?

[Marc_B]

https://adsbperformance.faa.gov/paprusersguide.pdf