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Old 02-22-2018, 01:26 PM
Kevin Handley Kevin Handley is offline
Join Date: Feb 2017
Location: Cambridge ,United Kingdom
Posts: 4
Default Rv12 Spar Pin Light

Hello all
Just bought a rv 12 and noticed that the spar pin light was lit and the engine would not start the owner said that he was told that it was probably a faulty sensor and the pins are in place ok just touch the top of the pins and it should deactivate the light which it did.
Any help to sort this out would be appreciated
ThNks in advance
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Old 02-22-2018, 02:00 PM
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DaleB DaleB is offline
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,838

If it's an older one (not sure about the new ones), there is a magnet glued into the top of each latch pin. One of mine came loose, and would occasionally cause that symptom. All I have to do is push down on the tip of the latch pin to re-seat the magnet, and all's well. Next time I'm in there (and remember it) I need to dab a little epoxy or put a drop of superglue on it.

The alignment of the reed switch can also be a little touchy. You can adjust the position of the switch for more reliable operation. One of mine needed about 1/8" of adjustment right after I bought it.
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
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Old 02-22-2018, 03:58 PM
AZLeeJay AZLeeJay is offline
Join Date: Dec 2013
Location: Phoenix
Posts: 108

You can always push the spar pin light in and the engine will start with it depressed and continue to run with it un-depressed.
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Old 02-23-2018, 06:55 AM
Mich48041 Mich48041 is offline
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,636

Move the magnetic reed switch closer to the magnet. Or better yet, mount the reed switch parallel to the magnet.
Joe Gores
RV-12 Flying
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Old 02-23-2018, 08:11 AM
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DonFromTX DonFromTX is offline
Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,746

I fought mine longer than I should have, finally achieved success by bending the legs on the clamps to allow a better relationship between the switch and the magnets.
A&P, PP-SEL, Pathological Flier, EAA Technical Counselor
EAA Chapter 595 President,
Retired US Army Officer
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Old 02-23-2018, 12:06 PM
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Tony_T Tony_T is online now
Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,204
Default Spar pin switch upgrade is available

For the OP and other's with the old style switches. The magnetic spar pin switches are a bit hard to adjust, and can be pesky. Van's changed the design to mechanical push switches in 2015 and there is a retrofit kit available

I have upgraded using the kit and the mechanical switches work well and are much easier to adjust.
RV-12 #202 -- Flying
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Old 02-24-2018, 12:03 AM
Handclutch Handclutch is offline
Join Date: Feb 2015
Location: Bendigo, Australia
Posts: 59

I had the same problem and fixed it by taking about I/8 off the tubes to better expose the magnets - works perfectly now.

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Old 02-24-2018, 02:53 AM
Kevin Handley Kevin Handley is offline
Join Date: Feb 2017
Location: Cambridge ,United Kingdom
Posts: 4
Default Spar pins

Thanks All for your replies
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Old 02-24-2018, 10:23 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,220

I helped a guy fix his. It was actually a bad reed switch, so I recommend putting a strong magnet up against the switch first to be sure its not magnet position that is causing the issue.
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