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  #1  
Old 03-22-2013, 07:26 AM
Walt's Avatar
Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
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Default SAIB (Special Airworthiness Info Bulletin) on Switch Style Circuit Breakers

I've never been a fan of the switch/breaker combo, if you are using these or plan on using them, you need to read the latest SAIB.

LINK TO SAIB
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  #2  
Old 03-22-2013, 09:07 AM
aerhed aerhed is offline
 
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Location: Big Sandy, WY
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Default

I like breaker switches. We've been changing out those W31 types for near 15 years. Just because those have always been junk is no reason to dis all breaker switches.
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  #3  
Old 03-22-2013, 09:14 AM
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ccsmith51 ccsmith51 is offline
 
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Location: Orlando, FL
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Default

Quote:
Originally Posted by aerhed View Post
I like breaker switches. We've been changing out those W31 types for near 15 years. Just because those have always been junk is no reason to dis all breaker switches.
What are you replacing the W31's with? I have six in my -4; five for lighting and 1 for fuel pump.
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  #4  
Old 03-22-2013, 09:30 AM
aerhed aerhed is offline
 
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I think it started with Westwinds and then spread to Beeches and twin Cessnas. If I'm remembering right, there is a braided strap in there that flexes with switch actuation. The strands break and they get fuzzy inside and short. The certified replacements are ungodly expensive. I like the ETA breaker switch series, but they are rectangular rockers so it might not work for you
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  #5  
Old 03-22-2013, 09:41 AM
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Walt Walt is offline
 
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I would recommend the Klixon, but they are not cheap (another example of you "generally" get what you pay for).

Why am I not a fan of these... you can get a good Klixon breaker and Honeywell switch for about $50 less than the combo unit.

http://www.aircraftspruce.com/catalo...klixon7270.php
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  #6  
Old 03-22-2013, 10:08 AM
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longranger longranger is offline
 
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Quote:
Originally Posted by ccsmith51 View Post
What are you replacing the W31's with? ...
Since the SAIB recommends replacement every 2000 hours, I'd just replace mine with more W-31's. I wouldn't change engine brands just because it was recommended for replacement every 2000 hours...
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  #7  
Old 03-22-2013, 11:36 AM
Mile High Relic Mile High Relic is offline
 
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Location: Denver area
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The SAIB says 2% failure at 2000 cycles, but recommends 2000 hours. Seems like too many hours to me. If my plane gets to 2000 hours (or even 2000 cycles) on the switch/breakers with me flying it, I'd happily replace the two S/Bs I have.
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  #8  
Old 03-22-2013, 12:01 PM
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Mark Burns Mark Burns is offline
 
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Default Wow

2000 cycles is an extremely low rating for an electrical device.

The manufacturer is saying they are safe as long as you don't use them much

Mark
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Last edited by Mark Burns : 03-22-2013 at 12:35 PM.
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  #9  
Old 03-22-2013, 12:27 PM
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tommylewis tommylewis is offline
 
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Default my experience

I just replaced two W31 switchable breakers in our RV7a during the condition inspection because the breaker used for the boast pump failed. While I had the bus bar apart, I replaced another one also. I now carry two spares in my box of stuff I carry. Since our RV7a is 6 years old this month, I guess I will be changing these two every 5 or 6 years.
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  #10  
Old 03-23-2013, 08:52 AM
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N184DA N184DA is offline
 
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Exclamation FYI: Circuit Breaker Switch SAIB (Special Airworthiness Information Bulletin)

I have some of these installed in my RV-4, in fact, they are my primary method of control over my primary electrical systems:

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/dc7bd4f27e5f107486257221005f069d/469f896b8a88d2a886257b2d0066ed6c/$FILE/CE-13-22.pdf
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