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GT50 Flight Data System in my Yak52

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B747crew

Joined: 04 Nov 2007
Posts: 20

Posted: Tue Jan 15, 2008 4:26 am Post subject: GT50 Flight Data System in my Yak52

I've experienced a problem with a battery drain on my Yak52 in very cold weather and have found based on installation information that the GT50 draws about .06 amps and is constantly powered by the ships battery via the hot bus. Has anyone else experienced a problem with this unit draining down the ships batteries???

 Thanks Jack Snodgrass

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Jack Snodgrass
4305 Claridge Ct.
Apex, NC 27539
919-745-7434

dsavarese(at)elmore.rr.co
Guest

Posted: Tue Jan 15, 2008 6:30 am Post subject: GT50 Flight Data System in my Yak52

Jack, What's a GT50?  I believe you and I talked about this on the phone. 

Based on our discussion, did you replace the batteries yet?  .06 amp draw 

(6-100ths of an amp) on those two huge batteries should not be a problem 

unless of course you're leaving your aircraft stored for a year.

Dennis



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brian-1927(at)lloyd.com
Guest

Posted: Tue Jan 15, 2008 8:09 am Post subject: GT50 Flight Data System in my Yak52

On Jan 15, 2008, at 4:26 AM, B747crew wrote:



 	  Quote: 	
		   



 I've experienced a problem with a battery drain on my Yak52 in very  

 cold weather and have found based on installation information that  

 the GT50 draws about .06 amps and is constantly powered by the ships  

 batter via the hot bus. Has anyone else experienced a problem with  

 this unit draining down the ships batterys???


	


Almost all radios (and certainly all GPS's) use a small amount of  

power to keep their memories alive. OTOH, most use some kind of  

internal battery to perform the task as the power required is very,  

very small, on the order of a few microamps. Very few use the  

aircraft's battery simply because there is no guarantee that it will  

always be there.



If your radio is indeed drawing 60mA (0.06A) from the battery, you can  

count on that running a 25AH battery down in about 400 hours (about 17  

days). Add to that the self-discharge rate of about 1% per day and you  

begin to see why it is a good idea to keep your battery on a proper  

float charge if you aren't going to be flying every week.



Brian Lloyd                         3191 Western Drive

brianl AT lloyd DOT com             Cameron Park, CA 95682

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



PGP key ID:          12095C52A32A1B6C

PGP key fingerprint: 3B1D BA11 4913 3254 B6E0  CC09 1209 5C52 A32A 1B6C

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B747crew

Joined: 04 Nov 2007
Posts: 20

Posted: Tue Jan 15, 2008 11:09 am Post subject: GT50 Flight Data System in my Yak52

Dennis;    Thanks for the information. I'm just attempting to sort out the problem and think it through so that I understand whats happening. Th GT50 is a "Flight Data Systems". 

     When I left the aircraft before the battery went dead I was sure that I pulled all the appropriate C/B's and turned everytrhing off. ( None of the avionics is on a master sw and must be turned off individually ) Now when I got to the Aircraft the Battery was down to about 6 VDC. from a full charge. That said I reason the only things that could have drawn down the ships battery was either the GPS or the GT50 unless there is a direct short somewhere in the system somewhere. Now when I pulled the batteries out of the aircraft they appear to be origional to the ship and 2 terminals were corroded so that prompted me to buy 2 new batts which I havn't yet installed but will this next weekend. I'm thinking that the entire avionics package needs to be on an avionics bus with a seperate master sw.........  Your Thoughts?? By the way did you get my check?

  Kindest  Regards

  Jack

 

 

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Jack Snodgrass
4305 Claridge Ct.
Apex, NC 27539
919-745-7434

dabear(at)damned.org
Guest

Posted: Tue Jan 15, 2008 11:52 am Post subject: GT50 Flight Data System in my Yak52

Off the wall question...



Do you have something run directly off the battery such as a NR headset 

power connector?  I had my NR headset that would run the battery down in 

about 2 weeks.



DaBear



b747crew2003(at)aol.com wrote:

[quote] Dennis;

    Thanks for the information. I'm just attempting to sort out the 

 problem and think it through so that I understand whats happening. Th 

 GT50 is a "Flight Data Systems". 

    When I left the aircraft before the battery went dead I was sure 

 that I pulled all the appropriate C/B's and turned everytrhing off. ( 

 None of the avionics is on a master sw and must be turned off 

 individually ) Now when I got to the Aircraft the Battery was down to 

 about 6 VDC. from a full charge. That said I reason the only things 

 that could have drawn down the ships battery was either the GPS or the 

 GT50 unless there is a direct short somewhere in the system somewhere. 

 Now when I pulled the batteries out of the aircraft they appear to be 

 origional to the ship and 2 terminals were corroded so that prompted 

 me to buy 2 new batts which I havn't yet installed but will this next 

 weekend. I'm thinking that the entire avionics package needs to be on 

 an avionics bus with a seperate master sw.........  Your Thoughts?? By 

 the way did you get my check?

 Kindest  Regards

 Jack

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B747crew

Joined: 04 Nov 2007
Posts: 20

Posted: Tue Jan 15, 2008 12:08 pm Post subject: GT50 Flight Data System in my Yak52

Nope nothing like that ... it has an EFIS system with battery backup and a GPS. The efis has a trickle charge to keep the internal battery charged but thats it. Jack

 

 

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Jack Snodgrass
4305 Claridge Ct.
Apex, NC 27539
919-745-7434

brian-1927(at)lloyd.com
Guest

Posted: Tue Jan 15, 2008 5:07 pm Post subject: GT50 Flight Data System in my Yak52

On Jan 15, 2008, at 11:07 AM, b747crew2003(at)aol.com wrote:



 	  Quote: 	
		   somewhere. Now when I pulled the batteries out of the aircraft they  

 appear to be origional to the ship and 2 terminals were corroded so  

 that prompted me to buy 2 new batts which I havn't yet installed but  

 will this next weekend. I'm thinking that the entire avionics  

 package needs to be on an avionics bus with a seperate master  

 sw.........  Your Thoughts?? By the way did you get my check?


	


As the resident electrical geek (I didn't get the callsign "sparky"  

for nothing) I have a few comments and/or suggestions.



Hopefully you received my earlier post where I pointed out that a 60mA  

constant drain on a 25AH battery will drain it in about 17 days. If  

your GT50 does have a "keep alive" circuit that is directly wired to  

the battery, bypassing the master contactor, it will drain the battery  

as you have described. Do put on a float charger that will keep the  

battery charged even under the small load imposed by the GT50's keep- 

alive circuit.



As for an avionics master, they are not a great idea. You are wiring  

everything through that one switch which, if it fails, takes out all  

your radios. It isn't hard to turn on each of the boxes. Most of us do  

not have more than about three boxes to turn on, e.g. GPS,  

transponders, and nav/com (or just com). For that matter you don't  

even need to turn them off. The main master switch will do that just  

fine.



Sounds to me like you might have a combination of a bad battery and a  

constant drain. A good idea is to take the batteries out, charge them  

fully, and then do a load test. A 25AH battery should be able to carry  

a 20A load for an hour. Put a couple of landing lights on there and  

see how long they run. (Stop the test when the voltage reaches 11V for  

a 12V battery or 22V for a 24V battery.)



Brian Lloyd                         3191 Western Drive

brianl AT lloyd DOT com             Cameron Park, CA 95682

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



PGP key ID:          12095C52A32A1B6C

PGP key fingerprint: 3B1D BA11 4913 3254 B6E0  CC09 1209 5C52 A32A 1B6C

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B747crew

Joined: 04 Nov 2007
Posts: 20

Posted: Tue Jan 15, 2008 5:19 pm Post subject: GT50 Flight Data System in my Yak52

Thanks Brian ;      I very much appreciate the helpful advice. 

      What a great web site where folks are so pleased to offer their support.    Jack

 

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Jack Snodgrass
4305 Claridge Ct.
Apex, NC 27539
919-745-7434

ChangDriver

Joined: 15 Sep 2007
Posts: 266

Posted: Thu Jan 17, 2008 1:34 pm Post subject: Re: GT50 Flight Data System in my Yak52

Jack:



There is an excellent article on batteries in the Dec 2007 issue of the EAA magazine Sport Aviation.



Craig

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