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04-24-2018, 02:30 PM
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Join Date: Jan 2005
Location: Indianapolis, IN (KUMP)
Posts: 1,024
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Degaussing
I've got the magnetometer for the G3X mounted aft in the tailcone
Today while doing the interference testing it failed massively with minimal rudder movement. Like >500%
Garmin says I need to degauss the rudder cables.
Has anyone done this? What is the best way to do so?
__________________
Thomas Short
KUMP - Indianapolis, IN / KAEJ - Buena Vista, CO
RV-10 N410TS bought / flying
RV-8 wings / fuse in progress ... still
1948 Cessna 170 N3949V
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04-24-2018, 02:36 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Amazon carries a tool for this.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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04-24-2018, 02:39 PM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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People often test for ferrous metal with a magnet, which then magnetizes the metal.
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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04-24-2018, 03:31 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Another potential interference source is the rear seat shoulder harness cables.
A simple backpacking compass can be used to test for unwanted magnetic fields.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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04-24-2018, 03:49 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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Been there done that... I have 2 degausers now because of an RV4, I had to buy the "big bertha" model for the RV4. After spending a bunch of $$ for the big one (weighs about 25 lbs) and having marginal success I finally gave up and put the magnetometer in the wing, problem solved (or at least I finally was able to get it to pass).
I think the wost offender was actually the trim cable and it was a lot easer to relocate the mag than RR the cable to degauss it. I had to call on my weightlifter friend to crawl in the back and I passed him the degausser and he did his best but still failed.
I still had to degauss the wing/aileron/hinge hardware though 
I was sweating it for a while as the gear legs were also magnetized and I worked on them for hours.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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04-24-2018, 03:52 PM
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Join Date: Jan 2005
Location: Indianapolis, IN (KUMP)
Posts: 1,024
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It has to be the rudder cables; it passes just fine until I move the rudder, and then the thing goes nuts.
We have some leeway (slack) in terms of moving it up, but relocating to the wing would be a nightmare with the CAN bus, etc...
__________________
Thomas Short
KUMP - Indianapolis, IN / KAEJ - Buena Vista, CO
RV-10 N410TS bought / flying
RV-8 wings / fuse in progress ... still
1948 Cessna 170 N3949V
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04-24-2018, 05:11 PM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,947
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Degauss tool
I've heard a gun type soldering iron works it have not tried it yet. Basically pass the cable through the space between the solder point loop, pull trigger and slide it along the cable slowly.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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04-24-2018, 05:19 PM
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Join Date: Jan 2005
Location: Indianapolis, IN (KUMP)
Posts: 1,024
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Quote:
Originally Posted by wirejock
I've heard a gun type soldering iron works it have not tried it yet. Basically pass the cable through the space between the solder point loop, pull trigger and slide it along the cable slowly.
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I saw that somewhere too ... stopped and got one on the way home from the airport just now.
Will report back...
__________________
Thomas Short
KUMP - Indianapolis, IN / KAEJ - Buena Vista, CO
RV-10 N410TS bought / flying
RV-8 wings / fuse in progress ... still
1948 Cessna 170 N3949V
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04-24-2018, 05:35 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Whatever you use, be sure to power it up prior to getting it close to the material. Move it slowly closer, continuing varying movements (circular works), and continue those movements until well away from the material. Only then power it down. Power-up and power-down causes large current/magnetic field excursions, which can re-magnetize your material.
Charlie
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04-24-2018, 05:42 PM
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Join Date: Mar 2006
Location: Edmond, OK
Posts: 194
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My shoulder harness cables became magnitized. Had some success using the soldering iron method.
__________________
Dan Burdette
Skyview, ADS-B, Garmin 420W, TT Gemini AP
RV-9A, IO-320, E-Mag
Guthrie-Edmond Rgnl, OK (KGOK)
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