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Garmin transponder power problems

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Coastflyer

Joined: 20 Mar 2016
Posts: 13

Posted: Sun Apr 10, 2016 7:02 am Post subject: Garmin transponder power problems

I've had a garmin transponder in my plane for the last 5 years. I bought it new. I think it's a GTX 327. For the past couple years it will randomly power off and back on. When it does this it is usually just momentary, sometimes staying off for up to 30sec. 

I checked the ground and power, and re racked it. I asked several avionics shops about it with no results. At this point I guess I'm just going to shine it until I'm required to buy an ads-b transponder unless anyone here has a suggestion.

Thanks

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jluckey(at)pacbell.net
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Posted: Mon Apr 11, 2016 8:45 am Post subject: Garmin transponder power problems

CoastFlyer,



Is there a possibility of a thermal event? I don't have any experience w/ the GTX 327 but I wonder if it has some kind of thermal shutdown feature.  The symptoms you describe might fit that profile:  it gets hot, has a thermal shutdown event, and then when it cools, it re-starts.

Is it:

1. mounted in a closed-in box?



2. located next to some other piece of equipment that gets hot?

3. does the event happen more often on warmer days?



Other things (off the top of my head):

4. the dreaded loose connection in the power wiring



5. flakey circuit breaker or avionics master switch





I had a situation a year back, where my whole avionics stack would shut down intermittently & rarely - long story short, it was a loose connection on the avionics master.

-Jeff

 

    On Sunday, April 10, 2016 8:22 AM, Coastflyer <jessejenks72(at)gmail.com> wrote:



  



 --> AeroElectric-List message posted by: "Coastflyer" <jessejenks72(at)gmail.com (jessejenks72(at)gmail.com)>



I've had a garmin transponder in my plane for the last 5 years. I bought it new. I think it's a GTX 327. For the past couple years it will randomly power off and back on. When it does this it is usually just momentary, sometimes staying off for up to 30sec. 

I checked the ground and power, and re racked it. I asked several avionics shops about it with no results. At this point I guess I'm just going to shine it until I'm required to buy an ads-b transponder unless anyone here has a suggestion.

Thanks





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Coastflyer

Joined: 20 Mar 2016
Posts: 13

Posted: Mon Apr 11, 2016 9:31 am Post subject: Re: Garmin transponder power problems

Jeff,

Thanks for the reply. I had wondered about overheating and asked the avionics shop that question. The guy said it shouldn't be an issue with that transponder. I have put my hand under the panel many times to see if it's getting hot, and haven't felt anything alarming. I don't have a cooling fan though, and it is stacked below my com radio, but that's it.

I guess I should go through the wiring again, because it sure does seem like a bad connection somewhere. Also maybe worth calling garmin to see if they have any input. I would be hesitant to send it in though because I could see getting a big repair bill with a diagnosis of "tests ok on the bench.

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jluckey(at)pacbell.net
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Posted: Mon Apr 11, 2016 11:04 am Post subject: Garmin transponder power problems

"I would be hesitant to send it in though because I could see getting a  big repair bill with a diagnosis of "tests ok on the bench."

Agree.  I have heard others complain about Garmin's flat-fee of $800 for GNS-430 test/repair. (Although I have no personal knowledge).  Might be different for your xponder.





 

    On Monday, April 11, 2016 10:53 AM, Coastflyer <jessejenks72(at)gmail.com> wrote:



  



 --> AeroElectric-List message posted by: "Coastflyer" <jessejenks72(at)gmail.com (jessejenks72(at)gmail.com)>



Jeff,

Thanks for the reply. I had wondered about overheating and asked the avionics shop that question. The guy said it shouldn't be an issue with that transponder. I have put my hand under the panel many times to see if it's getting hot, and haven't felt anything alarming. I don't have a cooling fan though, and it is stacked below my com radio, but that's it.

I guess I should go through the wiring again, because it sure does seem like a bad connection somewhere. Also maybe worth calling garmin to see if they have any input. I would be hesitant to send it in though because I could see getting a big repair bill with a diagnosis of "tests ok on the bench.





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nuckolls.bob(at)aeroelect
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Posted: Mon Apr 11, 2016 1:44 pm Post subject: Garmin transponder power problems

 	  Quote: 	
		  I guess I should go through the wiring again, because it sure does seem like a bad connection somewhere. 	


    A test I've used on occasion is to supply the

    victim device with a new power source. In the case

    of a transponder, it can be a 20AWG wire with a

    source-end 7A fuse tied to any handy hot-spot

    on the power distribution system.



    Cut into the victim's power wire(s) in a

    handy location, strip the radio end and splice

    the flying power lead to this exposed conductor.



    This is a flight-worthy 'modification' that

    can remain in place until you're sure that

    the intermittent condition has or has not

    repeated.



 

   Bob . . .

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Coastflyer

Joined: 20 Mar 2016
Posts: 13

Posted: Tue Apr 12, 2016 7:01 am Post subject: Re: Garmin transponder power problems

Thanks Bob,

I may end up doing that if I can't find something obvious. Good suggestion.

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