CB Rocker Switches

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jdsmaule
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CB Rocker Switches

Post by jdsmaule »

It's annual time on my friends MX-7-235, his fuel boost pump rocker switch is getting difficult to operate. I understand these are discontinued and newer Maule's are using toggle switches. Does anyone have a source for these switches? New or used? Part number is 20TC-BA-5.

Thanks!
Jeremy S.
1983 M-6-235

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rv8bldr
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Post by rv8bldr »

This just happened to me on my M5-235C. The switch completely bit the dust.

I called Maule and I think it was Brent who got on the phone and said "I haven't seen one of those in 30 years. They don't make them any more and we don't have any in stock"

Oops. I tried looking everywhere but no luck

I bought a 10A break toggle switch from Aircraft Spruce, made a little mounting plate to go where the rocker breaker was before and just installed it. This was at the suggestion of my A&P (called AME here in Canada).

Here is the link on the Aircraft Spruce Canada website:

https://www.aircraftspruce.ca/catalog/e ... tbrkr2.php

Hope this helps
Mark
President EAA Chapter 245
'79 Maule M5-235C C-GJFK
RV-8 C-GURV (Sold)
Bearhawk 4pl - Under Construction

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Andy Young
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Post by Andy Young »

I have sourced used switches from a low-wing Piper of some sort when I needed one. It wasn’t identical, but it was very similar, and fit perfectly. Amp rating etc was correct.

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Craigh-KRPH
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Post by Craigh-KRPH »

Searching "piper rocker switch" on eBay yielded a few results that might work for you.

Texas Air Salvage might also be another parts source: https://www.texasairsalvage.com/main_vi ... id1=212959
Craig Helm
'97 MXT-7-180A
Graham, TX (KRPH)

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rv8bldr
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Post by rv8bldr »

Well, poop :-) I didn't find those when I was looking.

I've now installed the Tyco switch so I will leave it. Should it ever fail, I know what to look for now.

Thanks, guys
Mark
President EAA Chapter 245
'79 Maule M5-235C C-GJFK
RV-8 C-GURV (Sold)
Bearhawk 4pl - Under Construction

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maules.com
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Post by maules.com »

The rocker switches sometimes fail because the tail end of a pop rivet or drilling debris finally shakes down into it left over from radio tray installations or changes.
It is often possible to fish the debris out of the switch. The colored switch face can be removed from the switch.
Jeremy
www.maules.com
Maule AK Worldwide

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jdsmaule
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Post by jdsmaule »

Thanks for the input guys! I have a lead on a switch, waiting to hear back once he can check inventory.

I had tried a few salvage yards and no luck. Those Piper switches look like a good match, just have to figure out the amp rating on those.

Regarding disassembly of the rocker switch that's what I did last year...after I had done some panel work prior. Popped the switch face off, sprayed some contact cleaner in there, couldn't really hear anything rattling around and started working fine. At least for a while.

Perhaps another go at taking it apart is in order, has to come out anyway!
Jeremy S.
1983 M-6-235

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andy
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Re: CB Rocker Switches

Post by andy »

Looks like my anti-collision light (strobe) breaker/switch has given up the ghost. I can't get it to switch on or mechanically lock in the on position. Jeremy mentioned that it's possible that some debris might have fallen into the switch and is preventing it from latching in place. My A&P is investigating that today but in case the switch itself is bad, I'm looking for a replacement.

I called Maule parts and these rocker-type breaker/switches are no long manufactured or available from Maule. They are using toggle breaker/switches now as jdsmaule and others mentioned.

Aircraft Spruce sells a Tyco W33-S2N1Q-10, which is a 10-amp breaker/switch like the E.T.A. 330826-12V in the Maule electrical system drawing but I can't get a datasheet on the dimensions of the E.T.A. switch to see if the Tyco will fit the cutout. My A&P is going to take measurements and send them to me today (I hope). I had to do a fair amount of Internet research to find the Tyco datasheet, which I found at https://www.te.com/commerce/DocumentDel ... F1393248-7 in case anyone is interested.

If the Tyco won't fit the cutout, then I'll have my A&P fabricate a metal plate with a hole to fit the toggle type Tyco W31X2M1G10 . It will look a little odd to have one toggle switch among the rocker switches so I'm considering replacing the anti-collision, landing light, nav light and pitot heat rocker type breaker/switches with toggle type breaker/switches. One single metal plate with holes could then be installed behind the panel for the 4 toggles. Has anyone done this?
Andy
1986 MX7-180

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rv8bldr
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Re: CB Rocker Switches

Post by rv8bldr »

That's what I did. I used the Tyco switch and made a small aluminum plate that spanned the the rocker switch gap (painted black so it blends in). Yes, the toggle looks different from the rockers, but it looks fine. Maybe make fancier labels :-)



Image
Mark
President EAA Chapter 245
'79 Maule M5-235C C-GJFK
RV-8 C-GURV (Sold)
Bearhawk 4pl - Under Construction

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andy
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Re: CB Rocker Switches

Post by andy »

The anti-collision light rocker switch/breaker is bad and needs to be replaced according to my A&P. He thinks that the internal spring broke and a repair wouldn't last. Maule sells a kit to retrofit all of the old rocker switches for around $346. They use separate toggle switches wired to circuit breakers. I don't want to suffer the cost and downtime of replacing all of the rocker switches so I decided to order one toggle switch and 10 amp circuit breaker to replace the one rocker switch. My A&P will fabricate an adapter plate to mount the toggle switch in the rectangular cutout.

I decided against the Tyco W31 thermal switch/breaker because of SAIB CE-13-22 and because Maule doesn't use them.
Andy
1986 MX7-180

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