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Old 04-06-2018, 07:55 AM
mwardle7 mwardle7 is offline
Join Date: Oct 2009
Location: Utah
Posts: 62

For those interested in adding a flap position sensor to a RV-12 ULS setup with the Garmin G3X, here's how I did it:

1. Purchase a Ray Allen position sensor. I used the POS-12, but you could use any of them. The difference with them is how far the "throw" of the sensor arm extends.

2. Fabricate a hat bracket to mount the position sensor. I added nutplates so that the position sensor could be easily serviced. Also fabricate an extension arm with a 90 degree twist. The length of the extension arm, and the height of the hat bracket will depend on the position sensor you use and the related "throw" of the sensor arm. Here's what mine looked like:

3. Attach the hat bracket to the seat rib that is to the right of the flaperon mixer arm. Attach the twisted extension arm to the flaperon mixer arm. Attach the position sensor to the hat bracket. Connect the position sensor to the twisted flaperon mixer arm extension with remote control airplane flight control rod and servo arm hardware. It should look something like this:

***The key to the entire installation is to ensure that the throw of the connection to the flaperon mixer arm matches the distance that the arm of the position sensor extends. ***

4. Wire the position sensor. I grounded the blue wire coming off of the position sensor to a bolt on a seat rib, then connected the orange wire to pin 30 on the P244 bus on the GEA 24 and the green wire to pin 31 on the P244 bus on the GEA 24; see Figure 30-2.3 for the flap position sensor wiring example in the G3X Touch Install Manual. Calibrate the switch on the POS 5 discrete input per section of the install manual, which is similar to how you calibrated the trim sensor on the original G3X Touch setup.

4. Unfortunately, Garmin does not have a way to link a master caution for flap overspeed if the flaps are deployed above 82 kts. Hopefully, that is something they will consider in a future update.
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Old 04-06-2018, 01:40 PM
Phantom30's Avatar
Phantom30 Phantom30 is offline
Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 652

This is definitely my next mod....tired of flying for 20/30 minutes wondering why cruise speed is limited...then getting a grin from my buddy when I say “Oh Crap” you didn’t see this.
Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
Distinguished Flying Cross Society Member
CH-47 & UH-1H "Driver"
Rotax 9 Series Service IRMT

RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
2018 Dues Paid
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Old 04-06-2018, 03:09 PM
DaleB's Avatar
DaleB DaleB is offline
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 1,959

When I do use flaps for takeoff I almost always have them raised before the end of the runway. It's not always a guarantee, though. I have just developed the habit of glancing out along the wing whenever I reduce power after takeoff, just to make doubly sure. The D180 isn't as flexible anyway.

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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