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Garmin Magnetometer GMU22 location

gossend

Well Known Member
Where is the GMU22 mounted in the RV-12? I did my Garmin installation before Vans began selling it, and I'm not happy with where I put it.
Thanks
 
so basically they put it up where the ADHRS for the Skyview was. So where'd they put the Garmin ADHRS?
 
Left wing

Dick, when I bought my kit, the ADAHRS went where the current drawings have you mount the GMU, so you're not off.

Probably not as easy with the wings done as you'd have to fish the wires out there, but you might consider mounting it out in the wing. I put mine in the 3rd bay in from the end of my left wing with the idea that it's out away from EMF sources.
 
For E-LSA CERTIFICATION of an RV-12 it has to be mounted where specified in the KAI (tail cone).

Scott, thanks for jumping in with that legal clarification... however, Dick clearly states his was built E-AB, as is mine.
 
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gmu022

Im RV12 838. MINE IS MOUNTED on the top of the tail section per Vans. I also put the stiffner to minimize movement of the tail.
I mounted the adsb box on the aft side of aft baggage bulkhead and tied the adsb wiring into aft autopilot actuator
 
Not exactly ELSA

My -12 (with Viking engine and wing tanks) has over 100 mods, big and small - firmly in the EAB camp 😎
I fininshed it in four years to the day and managed to enjoy over four thousand hours doinlg it!
Yep, occasionally I?ll break something so I can fix it and make it better! 🙃
 
Scott, thanks for jumping in with that legal clarification... however, Dick clearly states his was built E-AB, as is mine.

My -12 (with Viking engine and wing tanks) has over 100 mods, big and small - firmly in the EAB camp 😎
I fininshed it in four years to the day and managed to enjoy over four thousand hours doinlg it!
Yep, occasionally I?ll break something so I can fix it and make it better! 🙃

Good for both of you (not sure what problem you are solving by putting the magnetometer in a different location when it has worked fine in the tail cone of 500+ RV-12's).
I will admit I am guilty of not reading everyone's signature before making a post (especially if it is an entire paragraph long).
 
Good for both of you (not sure what problem you are solving by putting the magnetometer in a different location when it has worked fine in the tail cone of 500+ RV-12's).
I will admit I am guilty of not reading everyone's signature before making a post (especially if it is an entire paragraph long).

The problem being solved is that I have my transponder and ELT mounted on a shelf behind the baggage compartment, along with my GPS antennas mounted on the top of the empennage; both are within the interference ranges of the GMU.

Also, mounting the GMU out in the wing is not hard if you do it while you're building the wing - and makes for a fairly clean and interference free installation.

To truly comply with all of the interference rules for the GMU, you pretty much need it to be mounted about 30' away from the airplane. :rolleyes:
 
How an airplane is registered has no affect on its status as a LSA. LSA defines the characteristics of the aircraft. Think tail dragger or high wing. No matter how an aircraft is registered, it is still a tail dragger or high wing aircraft.
 
I?d add one caveat. Building EAB allows you to deviate from the manufacturer?s kit instructions, so you could build an RV-12 EAB and make it ineligible as an LSA if say you put a constant speed prop on it or if you listed a gross weight higher than 1320 lbs on the AW certificate application. But I agree with Joe that as long as you don?t do something that takes it out of the definition of an LSA a sport pilot can fly it.
 
I’d add one caveat. Building EAB allows you to deviate from the manufacturer’s kit instructions, so you could build an RV-12 EAB and make it ineligible as an LSA if say you put a constant speed prop on it or if you listed a gross weight higher than 1320 lbs on the AW certificate application. But I agree with Joe that as long as you don’t do something that takes it out of the definition of an LSA a sport pilot can fly it.

Wow, ok so this thread went a different way...

1. Yes, as RFSchaller inferred, E-AB and E-LSA can both be LSA. Compliance with LSA is defined in FAR 1.1 under Light-sport aircraft, which is:

[Light-sport aircraft means an aircraft, other than a helicopter or powered-lift that, since its original certification, has continued to meet the following:
(1) A maximum takeoff weight of not more than--
(i) 660 pounds (300 kilograms) for lighter-than-air aircraft;
(ii) 1,320 pounds (600 kilograms) for aircraft not intended for operation on water; or
(iii) 1,430 pounds (650 kilograms) for an aircraft intended for operation on water.
(2) A maximum airspeed in level flight with maximum continuous power (VH) of not more than 120 knots CAS under standard atmospheric conditions at sea level.
(3) A maximum never-exceed speed (VNE) of not more than 120 knots CAS for a glider.
(4) A maximum stalling speed or minimum steady flight speed without the use of lift-enhancing devices (VS1) of not more than 45 knots CAS at the aircraft's maximum certificated takeoff weight and most critical center of gravity.
(5) A maximum seating capacity of no more than two persons, including the pilot.
(6) A single, reciprocating engine, if powered.
(7) A fixed or ground-adjustable propeller if a powered aircraft other than a powered glider.
(8) A fixed or autofeathering propeller system if a powered glider.
(9) A fixed-pitch, semi-rigid, teetering, two-blade rotor system, if a gyroplane.
(10) A nonpressurized cabin, if equipped with a cabin.
(11) Fixed landing gear, except for an aircraft intended for operation on water or a glider.
(12) Fixed or repositionable landing gear, or a hull, for an aircraft intended for operation on water.
(13) Fixed or retractable landing gear for a glider. ]

2. I get what you're saying, but it's not really an E-AB issue, it's an LSA issue. Irrelavent of the certification, failure to comply with rules is non-compliant. It's even worse for E-LSA, because once you violate the LSA compliance, the airframe is done - it can't be recertificated. At least with E-AB, you can still keep flying the thing, just not as an LSA. You can deviate from any certificate - E-LSA, E-AB, or even a certified Part 23 aircraft for that matter, and violate the certificate. You're essentially stating that you need to follow the compliance rules to be in compliance with them. Ok, valid point.

3. The application you refer to is form FAA 8130-6, however note that there does not appear anywhere on the form a declared gross weight. I see this over and over - and cringe. The only statement of gross weight is the current weight and balance; and the application simply requires, in section VIII d. the FAA/Designee to ensure, "Current Weight and Balance Information Available in Aircraft". Legally, you could reissue a new W&B information to your aircraft 5 minutes after inspection. It seems silly to me doing that, but you could. The point being Gross Weight is simply on the W&B maintained in the airplane, not declared on the application.
 
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