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Is an ATC/ATO Fuse Block a Realistic Single Pt. of Failure

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jan 22, 2020 6:32 pm Post subject: Is an ATC/ATO Fuse Block a Realistic Single Pt. of Failure

At 02:09 PM 1/22/2020, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "markfw" <markwheelermd(at)icloud.com>



 I am building an electrically dependent airplane and I have used almost entirely fused circuits as Bob has suggested.



 So, I will be using two ATC/ATO fuse blocks tied together for my endurance bus. THEORETICALLY each is a single point of failure. 



 It's difficult to imagine how an entire fuse block could fail if the nuts on the terminals are properly applied. Should I worry about this? What are people's opinions?



 Thanks.



 Mark 	


   TWO fuse blocks on the endurance bus? What

   loads run from this bus?



   Those fuse blocks are components of

   a bus-structure . . . generally considered

   10 to the minus 9th reliability, assuming

   no errors of assembly.



   After installation of the fuse block

   feeder nuts, tighten snuggly and put

   a drop of super-glue at the juncture

   of the stud and nut. Alternatively 

   you could replace the existing nut

   with an elastic stop-nut. I think that

   stud is a 10-24 thread . . . most ACE

   hardware stores stock these nuts for

   about $0.60 each.



   Beyond that simple precaution, there's

   not much to worry about as long as you

   pay attention to details of assembly

   during installation.

 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Jan 22, 2020 7:05 pm Post subject: Is an ATC/ATO Fuse Block a Realistic Single Pt. of Failure

At 02:09 PM 1/22/2020, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "markfw" <markwheelermd(at)icloud.com>



 I am building an electrically dependent airplane and I have used almost entirely fused circuits as Bob has suggested.



 So, I will be using two ATC/ATO fuse blocks tied together for my endurance bus. THEORETICALLY each is a single point of failure. 



 It's difficult to imagine how an entire fuse block could fail if the nuts on the terminals are properly applied. Should I worry about this? What are people's opinions?



 Thanks.



 Mark 	


   TWO fuse blocks on the endurance bus? What

   loads run from this bus?



   Those fuse blocks are components of

   a bus-structure . . . generally considered

   10 to the minus 9th reliability, assuming

   no errors of assembly.



   After installation of the fuse block

   feeder nuts, tighten snuggly and put

   a drop of super-glue at the juncture

   of the stud and nut. Alternatively 

   you could replace the existing nut

   with an elastic stop-nut. I think that

   stud is a 10-24 thread . . . most ACE

   hardware stores stock these nuts for

   about $0.60 each.



   Beyond that simple precaution, there's

   not much to worry about as long as you

   pay attention to details of assembly

   during installation.

 

   Bob . . .

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markfw

Joined: 28 Feb 2019
Posts: 27
Location: Seattle, WA

Posted: Fri Jan 24, 2020 3:27 pm Post subject: Re: Is an ATC/ATO Fuse Block a Realistic Single Pt. of Fai

Bob,



You are right I should have called it my e-bus.



I have actually merged my endurance bus and e-bus. I had extra slots in my fuse block after wiring the EFI fuses. With the new low-power electronics my "other instruments" power draw in endurance mode is only 1.9 amps of the total 9.15 amps power draw, so I think I can afford the power draw and it is simpler.



Those instruments are (currently):



GRT EIS

B & C Warning LED

Trim servo

COM1 - MGL V6 Radio

Sandia Mode "C" Transponder - STX165R

uAvionix - SKYFYX GPS

Bose Headphones (2)

uAvionics ADS In/Out - EchoUAT

MGL ASV-1 (ASI, VSI, Alt Combo) & Altitude encoder

EFI Monitor Gauge



With this setup I am visible to, and can talk to, the world, I still have traffic, weather, etc on a tablet on battery, and I can monitor my engine and the EFI.



With my dual battery, 24 amp hour reserve I should have a safe, low stress flight for at least 2 hours in an ALT OUT situation. I am day, VFR so I am comfortable with this. I have been trying to follow your flight planning advice, and I thank you for it.



I am working on my FMEA.



Mark

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