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Aircraft Certfication

FAA Airworthiness Certification & Registration Information and Resources for Sonex Aircraft

Sonex Aircraft, LLC has partnered with the FAA, EAA and other aircraft manufacturers to play a leading role in shaping and adopting today's Experimental/Amateur-Built aircraft rules. We have compiled this page of information to help Sonex Aircraft builders register and certify their homebuilt aircraft projects.


"Major Portion" or "51 Percent Rule" Compliance

As of March 31 2010, Sonex Aircraft, LLC kits are the first amateur-built kits to be accepted by the FAA under Advisory Circular AC 20-27G, FAA Order 8130.2G CHG 1, and FAA Order 8130.35B via FAA National Kit Evaluation Team (NKET) evaluation, with the newer Onex kit design being added on February 10, 2012, Quick Build Kits and kits with Matched-Hole Formed Parts added July 8, 2013, and the SubSonex EAB Quick Build Kit was added on September 15, 2014. Sonex Aircraft recommends that all builders thoroughly read and understand these rules. All Sonex Aircraft kits can be found on the FAA's listing of Amateur-Built Kits Checklists and Approval Letters Evaluated by National Kit Evaluation Team (NKET) with direct links below to help builders easily identify the proper checklist to use for their specific kit.

NKET evaluation not only bolsters the pre-existing, grandfathered evaluations of Sonex Aircraft kits, but it also updates the acceptance to include the latest Pre-Assembled Main Wing Spar and Machined Angle Component, Matched-Hole Formed Parts, and Quick Build kit upgrades offered by Sonex Aircraft, LLC, showing that all Sonex Aircraft kits with all available options can be built within the rules. Additionally, Sonex Aircraft customers can use NKET checklists to determine exactly how much commercial assistance may be used in the construction of their projects without violating the “major portion” requirement of 14 CFR section 21.191(g) for experimental/amateur-built aircraft, commonly referred to as the “51 Percent Rule.”

Sonex Aircraft builders should download the appropriate selection among the following Amateur-Built Aircraft Fabrication and Assembly Checklist (2009 & 2011) forms for Sonex, Waiex, Xenos, and Onex aircraft for use as kit compliance documents. Insructions for using these checklists can be found in FAA Advisory Circular AC 20-27G.

FAA NKET Amateur-Built Fabrication and Assembly Checklists:
SubSonex:
Quick Build Kit:
Sonex-B:
Quick Build Kit:
Complete Airframe Kit or Sub-Kits:
Sonex:
Quick Build Kit:
  • SONEX_SNX-QB-070813.pdf (Sonex Kit Checklist for use with Sonex Quick Build Kit) [PDF file]
  • Sonex_0726201311293100.pdf (Sonex/Waiex/Onex Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades + Matched-Hole Formed Parts added to kits August, 2012 or Quick Build Kits) [PDF file]
     
Complete Airframe Kit or Sub-Kits (shipped August, 2012 or later -- includes Matched-Hole Formed Parts):
  • SONEX_SNX-KIT-ALL-MHP-070813.pdf (Sonex Kit Checklist for use with or without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades: any kit shipped August, 2012 or later -- includes Matched-Hole Formed Parts) [PDF file]
  • Sonex_0726201311293100.pdf (Sonex/Waiex/Onex Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades + Matched-Hole Formed Parts added to kits August, 2012 or Quick Build Kits) [PDF file]
     
Complete Airframe Kit or Sub-Kits (shipped prior-to August, 2012) with Pre-Assembled Main Wing Spar and/or Machined Angle Component kit upgrades:
  • SonexFinishSpar.pdf (Sonex Kit Checklist for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
  • SonexFinishSparLtr.pdf (Sonex Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
     
Complete Airframe Kit or Sub-Kits (shipped prior-to August, 2012) with no kit upgrades:
  • Sonex.pdf (Sonex Kit Checklist for use without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
  • SonexLtr.pdf (Sonex Kit Letter of Eligibility for use without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
     
Waiex-B:
Quick Build Kit:
Complete Airframe Kit or Sub-Kits:
Waiex:
Quick Build Kit:
  • WAIEX_WIX-QB-070813.pdf (Waiex Kit Checklist for use with Waiex Quick Build Kit) [PDF file]
  • Sonex_0726201311293100.pdf (Sonex/Waiex/Onex Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades + Matched-Hole Formed Parts added to kits August, 2012 or Quick Build Kits) [PDF file]
     
Complete Airframe Kit or Sub-Kits (shipped August, 2012 or later -- includes Matched-Hole Formed Parts):
  • WAIEX_WIX-KIT-ALL-MHP-070813.pdf (Waiex Kit Checklist for use with or without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades: any kit shipped August, 2012 or later -- includes Matched-Hole Formed Parts) [PDF file]
  • Sonex_0726201311293100.pdf (Sonex/Waiex/Onex Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades + Matched-Hole Formed Parts added to kits August, 2012 or Quick Build Kits) [PDF file]
     
Complete Airframe Kit or Sub-Kits (shipped prior-to August, 2012) with Pre-Assembled Main Wing Spar and/or Machined Angle Component kit upgrades:
  • WaiexFinishSpar.pdf (Waiex Kit Checklist for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
  • WaiexFinishSparLtr.pdf (Waiex Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
     
Complete Airframe Kit or Sub-Kits (shipped prior-to August, 2012) with no kit upgrades:
  • Waiex.pdf (Waiex Kit Checklist for use without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
  • WaiexLtr.pdf (Waiex Kit Letter of Eligibility for use without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
     
Onex:
Quick Build Kit:
  • ONEX_ONX-QB-070813.pdf (Onex Kit Checklist for use with Sonex Quick Build Kit) [PDF file]
  • Sonex_0726201311293100.pdf (Sonex/Waiex/Onex Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades [all Onex kits shipped since 2011 include Matched-Hole Formed Parts] or Quick Build Kits) [PDF file]
     

Complete Airframe Kit or Sub-Kits with Pre-Assembled Main Wing Spar and/or Machined Angle Component kit upgrades:
  • ONEX_ONX-KIT-ALL-MHP-070813.pdf (Onex Kit Checklist for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
  • Sonex_0726201311293100.pdf (Sonex/Waiex/Onex Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades [all Onex kits shipped since 2011 include Matched-Hole Formed Parts] or Quick Build Kits) [PDF file]

Complete Airframe Kit or Sub-Kits with no kit upgrades:
  • Onex.pdf (Onex Kit Checklist and Letter of Eligibility for use without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
  • OnexLtr.pdf (Onex Kit Letter of Eligibilityfor use without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
     
Xenos:
Quick Build Kit:
Complete Airframe Kit or Sub-Kits with Pre-Assembled Main Wing Spar and/or Machined Angle Component kit upgrades:
  • XenosFinishSpar.pdf (Xenos Kit Checklist for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
  • XenosFinishSparLtr.pdf (Xenos Kit Letter of Eligibility for use with Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
     
Complete Airframe Kit or Sub-Kits with no kit upgrades:
  • Xenos.pdf (Xenos Kit Checklist for use without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
  • XenosLtr.pdf (Xenos Kit Letter of Eligibility for use without Pre-Assembled Main Wing Spar and/or Machined Angle Component Kit upgrades) [PDF file]
     

Amateur-Built Aircraft Fabrication and Assembly Checklist (2009 & 2011) form FAQ's:

Q: What is so significant about these checklists?
A:
The Sonex, Waiex, and Xenos were the first Amateur-Built Kits to be accepted by the FAA under Advisory Circular AC 20-27G, FAA Order 8130.2F, and FAA Order 8130.35. The Onex checklists were accepted on in February, 2012 with Quick Build Kits and Sonex & Waiex kits with Matched-Hole Formed Parts added July 8, 2013. Sonex encourages everyone involved with Experimental-Amateur Built Aircraft to thoroughly read and understand these rules.

Q: I'm building a Sonex Aircraft, how do I use this checklist?
A:
These new checklists are the starting point for you if you purchase a Sonex Aircraft Complete Airframe Kit or Sub-Kits with or without Pre-Assembled Main Wing Spars and/or Machined Angle Component kit upgrades. You should use these checklists to prove that you are building the majority of the aircraft. You can also use these new lists to legally obtain commercial assistance on your project. The column on the right-hand side contains a place for the FAA (or FAA Designated) Inspector to review what you've had done for you for compliance as part of your aircraft registration process.

Q: How do I get a copy of the checklists?
A:
Download them right from our web site (above)! We have established this web page dedicated to materials needed for registration.

Q: I have a lot of questions on how to register my homebuilt aircraft. What should I do?
A:
Order the comprehensive Amateur-Built Aircraft Certification Kit (below) from EAA. This should answer all of your questions by providing a step-by-step guide through the registration process.

For More Information: See our official Press Release at: http://www.sonexaircraft.com/press/releases/pr_040910.html

Recommended Reading: EAA Experimenter Magazine, January 2013 "Building Your Homebuilt Using the New FAA Major Portion Checklist" by Joe Gauthier

Still Have Questions?: You can email your questions to us at: info@sonexaircraft.com


Registration and Airworthiness Certification

Sonex Aircraft, LLC highly recommends that all builders use the EAA Amateur-Built Aircraft Certification Kit, which is available for purchase online.

The kit includes everything you need to register and certificate a new experimental amateur-built aircraft. The 15-page, step-by-step Certification Guide walks you through the entire process-from getting an N number to the aircraft inspection-and provides samples of how to complete each required form. The certification kit also includes all FAA forms, Experimental sticker (in black), dataplate, and a convenient placard decal sheet.


Xenos Motorglider Certification Tips

We asked Joe Norris from EAA, one of the foremost experts on Experimental Aircraft Registration, and he responded with the following. While there is no formal FAA procedure for this, we highly recommend that you follow these steps to ensure your Xenos is registered as a glider:


First, when registering the aircraft make sure to indicate that it is a "glider". This would be done by indicating "glider" where it asks for "class" on the Affidavit of Ownership (FAA Form 8050-88).

Once the aircraft is registered as a "glider", the next step would be to point out to the person doing the airworthiness inspection that you wish to have the aircraft certificated as a "glider". Since there is no way to indicate this on the airworthiness application paperwork, it would be important to indicate this both verbally when talking to the inspector, and also by including a note in your application package indicating that you wish to have "glider" indicated on the airworthiness certificate. This should trigger the inspector to look at FAA Order 8130.2 regarding the listing of "glider" on the experimental airworthiness certificate. This guidance is currently found in Chapter 4, Section 7, paragraph 4071d, found on page 4-36 of FAA Order 8130.2G change 1. The applicant may need to actually point the inspector toward that section, as this may be something the inspector has never been involved with before.

All other application paperwork is filled out the same whether the aircraft is a glider or not. This being the case, it will be up to the applicant to make it clear to the inspector that the aircraft is a glider and should be certificated as such.


Sonex Aircraft, LLC also recommends that you fill out your 8050-88 form to read Model: Xenos Motorglider.


 

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