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VAF Forums
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> Safety
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SAIB (Special Airworthiness Info Bulletin) on Switch Style Circuit Breakers
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03-23-2013, 08:03 AM
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Join Date: Jul 2010
Location: Orlando, FL
Posts: 1,077
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__________________
Chris Smith
Maule M5-180C (Sold)
RV-6 O-360 CS (Sold)
RV-4 O-360 FP (Sold)
Full-time in the other type of RV....
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03-28-2013, 07:34 AM
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Join Date: Feb 2008
Location: MN
Posts: 77
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If I read correctly, the part numbers called out were all 50 Amp breakers. I know I don't have any of those! (the -50 at the end is calling out the amp value)
Vince
RV-7
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03-28-2013, 08:06 AM
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Join Date: Jan 2005
Posts: 769
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my failure
The breaker that I had fail was a 10 amp.
__________________
Tom Lewis
RV7a N967BT 1900 hrs.
RV10 N143EB 960 hrs.
Granbury, Tx
http://bit.ly/2bnimsZ
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03-28-2013, 10:16 AM
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Join Date: Oct 2008
Location: Atlanta, GA
Posts: 254
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Sounds like much ado about nothing. I have these all over my panel and have had one issue with the amp size not being large enough for the load.
2% at 2000 cycles with an average of one cycle per flight hour is the same as my recommended TBO engine overhaul which will concern me when I get that far.
50% at 6500 hrs 90% or more of those flying RV's will never see that amount of usage on thier aircraft in the owners lifetime. I see 15 year old Rv's in the ads all the time with less than 700 hrs on the airframe.
Put an extra 5 and 10 amp W31 breaker ( $50 cost) in your emergency haul around bag and forget about it.
John Morgan
__________________
John Morgan
Atlanta, GA KPDK
N613SC
RV6A -SMILIN 1
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03-28-2013, 10:28 AM
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Join Date: May 2009
Location: Houston, TX
Posts: 531
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EDIT: I still don't like these numbers for a switch.
Quote:
Analysis of available service difficulty report (SDR) data indicates 2
percent of those analyzed failed by 2,000 cycles; 50 percent of those analyzed failed by 6,500 cycles, and 90 percent of those analyzed failed by 10,000 cycles.
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__________________
-Rick Greer, VAF #2492
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03-28-2013, 11:40 AM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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Chat with Tyco
I just went to the Tyco site and did a "chat" with one of their guys. He had no idea what SAIB even was. I sent him the link and he was baffled. He said he would have to talk to engineering and get back to me.
I just read this as I was installing the switches in my panel. Almost every switch I have is a Tyco W31. I do not want to put switches in that are going to be a problem.
I assume that many of the RV's flying today have these same switches and I haven't heard of that many problems, but if people are carrying spares, that is not good. I have never had a switch go out in any of my cars or trucks. Maybe I should get auto switches?
Those Klixon 7270's are expensive. At $120 a switch, that sounds like crazy money. Maybe carrying around spare switches is the answer. I am stumped. I will post if tyco gets back to me.
__________________
rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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03-28-2013, 12:33 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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Quote:
Originally Posted by rockwoodrv9
Maybe carrying around spare switches is the answer.
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Many RV'ers also carry spare tire inner tubes in their onboard emergency kit, and for the same reason. Parts wear out and break - if it's practical to do so, carry a spare.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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03-28-2013, 02:07 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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TE engineer
I tried to find out from Tyco what the story was. This is what I got back:
Hello,
Thank you for contacting TE Connectivity.
My engineer said: "This is the first I heard of this. There is really little that I can say other than the FAA recommendation be followed."
Dale
Thank you for your inquiry,
TE Connectivity
Technical Support Center
http://www.te.com
For Support: http://www.te.com/help
800-522-6752 x2
I guess I will just take the chance and hope I am on the good side of the odds and change as they **** out!
__________________
rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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01-24-2017, 09:40 PM
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Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 845
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10 amp TYCO W31 series toggle Circuit Breaker failure.
Resurrecting an old post.
Today, after run up and just prior to take off, I switched the TYCO W31 toggle breaker (10A) for my Airflow Performance fuel pump on and got nothing.
With the engine running I can't hear the pump operating so I look at my EFIS to see if I get an indication of rise in fuel pressure and an increase in amperage. Again, nothing. I returned to the hangar to investigate. Result, bad TYCO.
Before reading this thread, I replaced the TYCO with another TYCO and it works for now.
The KLIXON 7270-1 circuit breakers appear to be more optimal.
Do any of you use an indicator light to show when your fuel pump is running?
__________________
Charlie
RV-8
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