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  #1  
Old 06-14-2021, 04:40 AM
RV12Pilot RV12Pilot is offline
 
Join Date: Jun 2020
Location: Williamson GA
Posts: 21
Default EFIS fuse blown

Have a RV-12 with Dynon Skyview Classic.
What would cause the EFIS fuse to blow?
Last Saturday shortly after take off the EFIS fuse blew, got a “Aircraft Power Loss” message and was able to switch to the B/U battery. Returned to airport and landed. About 10 minutes later the B/U battery “died”.
Replaced the B/U battery.

TIA Charlie
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  #2  
Old 06-14-2021, 11:11 AM
Mich48041 Mich48041 is offline
 
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Location: Riley TWP MI
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The same thing happened to a friend of mine. Evidently the 5 amp fuse is OK for normal operations.
But if the Skyview is operated for any length of time on its internal backup battery, that battery runs down.
Then the next time that the plane goes flying, the combined current of the Skyview plus charging the rundown backup
battery is enough to blow the 5 amp fuse. If I remember right, he replaced the 5amp fuse with a 7.5 amp fuse.
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  #3  
Old 06-14-2021, 11:58 AM
RV12Pilot RV12Pilot is offline
 
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Location: Williamson GA
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Default EFIS fuse blown

Thank you for the information
Charlie
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  #4  
Old 06-14-2021, 12:17 PM
NinerBikes NinerBikes is offline
 
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Location: L.A.
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Running both down is also pretty hard on the Ducati Voltage Regulator, too.


If you can, put the main battery on a 10 amp 14.4V or higher capable battery charger and leave your main switch on, along with the Dynon Skyview, but pull the fuel pump fuse, for 1 to 1.5 hrs.

You want all batteries, both on the plane and the backup battery, as close to fully charged before you start up the engine and let it's charging system operate. Top charging an AGM battery before not using it is very important. They like to be stored with a full charge. I don't shut my motor off until the charging rate at 3000 rpms has dropped down to a 2 amp charge rate or less, before I shut down the motor.
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  #5  
Old 06-14-2021, 02:45 PM
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Tony_T Tony_T is offline
 
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Location: Lacey, WA
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Legacy 12's with Skyview had a 5 amp EFIS fuse. That was changed by Van's sometime around 2016, I think, to a 7.5 amp. The OP doesn't say what rating the blown fuse was, but using a 7.5 is currently approved.

BTW, the backup battery should be good for about an hour in flight. If there is a little exclamation point up in the Skyview header next to the clock then the battery needs to be tested. The test is a built-in feature within the Skyview, and runs about 45 minutes while you have lunch. There is also a yellow caution message, so you really can't miss it.
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Last edited by Tony_T : 06-14-2021 at 02:50 PM.
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  #6  
Old 06-14-2021, 02:59 PM
Norman CYYJ Norman CYYJ is offline
 
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Location: Victoria B.C.
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Look at the blown fuse. The way it blew will answer a lot of your questions.
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  #7  
Old 06-14-2021, 03:28 PM
gasman gasman is offline
 
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Quote:
Originally Posted by Norman CYYJ View Post
Look at the blown fuse. The way it blew will answer a lot of your questions.
That statement created another question.......
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  #8  
Old 06-14-2021, 07:18 PM
Norman CYYJ Norman CYYJ is offline
 
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If the fuse link is silvery black, short.
If sagging and broken too small of a fuse.
If a sharp break circuit overload for short period of time.
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  #9  
Old 06-14-2021, 07:38 PM
RV12Pilot RV12Pilot is offline
 
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Location: Williamson GA
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Quote:
Originally Posted by NinerBikes View Post
Running both down is also pretty hard on the Ducati Voltage Regulator, too.
I don't shut my motor off until the charging rate at 3000 rpms has dropped down to a 2 amp charge rate or less, before I shut down the motor.
I have the Odyssey battery. So this is something you’d recommend that I do?
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  #10  
Old 06-14-2021, 07:42 PM
RV12Pilot RV12Pilot is offline
 
Join Date: Jun 2020
Location: Williamson GA
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Quote:
Originally Posted by Tony_T View Post
Legacy 12's with Skyview had a 5 amp EFIS fuse. That was changed by Van's sometime around 2016, I think, to a 7.5 amp. The OP doesn't say what rating the blown fuse was, but using a 7.5 is currently approved.

BTW, the backup battery should be good for about an hour in flight. If there is a little exclamation point up in the Skyview header next to the clock then the battery needs to be tested. The test is a built-in feature within the Skyview, and runs about 45 minutes while you have lunch. There is also a yellow caution message, so you really can't miss it.
I had a 5 amp fuse. Am getting a 7.5 amp fuse tomorrow and replacing the 5 amp.

I did have the little exclamation point next to the clock for a few flight hours before all of this happened to me (didn’t know what that meant at the time). After the battery “died” I had a faint battery with an X on it next to the clock.
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