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merlewagner2
Joined: 01 Jun 2016
Posts: 18
Location: Spring Hill, FL
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 Posted: Sat Jul 29, 2023 6:27 am Post subject: ADS-B issue |
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Not sure if this is relevant to this forum but...
After going thru major fixes on my Tailwind I had a couple of test flights to check things out.
I took a look at Flightaware.com to see the flights and they came up but the airspeeds were very erratic. Positioning/tracking looked great, just airspeed was crazy.
I decided to pull an ADS-B report from the FAA to see what that stated. They came back with no report found on either flight. They suggested I send in the GPS/Transponder for repair.
Any thoughts on what would cause the FAA to throw out a flight, ie: not create a report. I don't have the detail on what info is broadcast on ADS-B so maybe someone might know of a document that explains the process.
Merle
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Eric Page
Joined: 15 Feb 2017
Posts: 244
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| Posted: Sat Jul 29, 2023 9:15 am Post subject: Re: ADS-B issue |
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Do you have a GPS-derived ground speed readout on the panel? Is it erratic in flight? If so, then it's probably a GPS problem and the transponder is just sending out the bad data that it's receiving.
If that's not it, then you might try a couple of things. First, make another flight, being sure to climb to at least a few thousand feet, fly a few straight legs of several minutes each, and talk to ATC to confirm that they can see you and are receiving all of the ADS-B data that they normally expect. If ATC reports a problem, or you still can't get an ADS-B report from the FAA, then go to the nearest avionics repair station and get the transponder tested.
Only if those two things show problems would I remove the transponder and send it for an expensive repair.
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David Lamphere
Joined: 20 Oct 2019
Posts: 19
Location: Culpeper, Virginia
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| Posted: Sun Jul 30, 2023 2:14 am Post subject: ADS-B issue |
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It’s been a while, but I remember that the key for my ADS-B report was using flight following. Getting ATC involved. Did you make sure your reg number was set (instead of anon) ?
Which ADS-B unit do you have?
Dave
Wittman Buttercup N365ED
On Jul 29, 2023, at 10:28 AM, merlewagner2 <wagnermerle(at)gmail.com> wrote:
Not sure if this is relevant to this forum but...
After going thru major fixes on my Tailwind I had a couple of test flights to check things out.
I took a look at Flightaware.com to see the flights and they came up but the airspeeds were very erratic. Positioning/tracking looked great, just airspeed was crazy.
I decided to pull an ADS-B report from the FAA to see what that stated. They came back with no report found on either flight. They suggested I send in the GPS/Transponder for repair.
Any thoughts on what would cause the FAA to throw out a flight, ie: not create a report. I don't have the detail on what info is broadcast on ADS-B so maybe someone might know of a document that explains the process.
Merle
--------
KC1DNJ
General Radiotelephone
Commercial SEL
A & P
Building scale P51, rebuilding Tailwind W10
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511166#511166
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merlewagner2
Joined: 01 Jun 2016
Posts: 18
Location: Spring Hill, FL
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| Posted: Mon Jul 31, 2023 3:47 am Post subject: Re: ADS-B issue |
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"Its been a while, but I remember that the key for my ADS-B report was using flight
following. Getting ATC involved. Did you make sure your reg number was set
(instead of anon) ?
Which ADS-B unit do you have?"
Thanks for the replies. The unit was working fine but then I relocated the transponder and made an extension cable to fit. I suspect this might be the culprit. Just strange that Flightaware (uses ADS-B data) sees me but the FAA does not. I will have to go back thru my flight data to verify ground speed but suspect data from GPS to transponder.
I have an ADS-B test set so I will check output. My transponder is a Trig TT22 and the GPS is a Safe-Fly 2020 from GRT.
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_________________
KC1DNJ
General Radiotelephone
Commercial SEL
A & P
Building scale P51, rebuilding Tailwind W10 |
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