AC 20-27G

Advisory circular · Certification and Operation of Amateur-Built Aircraft

Approved
September 30, 2009
Last reviewed
February 22, 2017
Family
AC 20-27 · 4 versions
Revision
G
14 CFR parts
21
14 CFR sections
§ 21.191

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed October 23, 2026.

Show pages 34–45

Appendix 8

A B C D FABRICATION AND ASSEMBLY TASKS Mfr Kit/Part/ Commercial Am-Builder Am-Builder Component Assistance Assembly Fabrication Task Empennage — 57 Listed Tasks # E1 Fabricate Horizontal Stabilizer Spars E2 Assemble Horizontal Stabilizer Spars to Stabilizer E3 Fabricate Ribs or Cores E4 Assemble Horizontal Stabilizer Ribs or Cores to Stabilizer E5 Fabricate Horizontal Stabilizer Leading and Trailing Edge E6 Assemble Horizontal Stabilizer Leading and Trailing Edges to Stabilizer E7 Fabricate Horizontal Stabilizer Brackets & Fittings E8 Assemble Horizontal Stabilizer Brackets and Fittings to Stabilizer E9 Assemble Horizontal Stabilizer Structure E10 Fabricate Horizontal Stabilizer Lead/Trailing Edges E11 Assemble Horizontal Stabilizer Lead/Trailing Edges to Stabilizer E12 Fabricate Horizontal Stabilizer Cables, Wires and Lines E13 Assemble Horizontal Stabilizer Cables, Wires and Lines to stabilizer E14 Fabricate Horizontal Stabilizer Empennage Covering or Skin E15 Assemble Horizontal Stabilizer Empennage Covering or Skin to Stabilizer E16 Assemble Horizontal Stabilizer Structure to F uselage E17 Fabricate Elevator Spars E18 Assemble Elevator Spars to Elevator E19 Fabricate Elevator Ribs or Cores E20 Assemble Elevator Ribs or Cores to Elevator E21 Assemble Elevator Structure E22 Fabricate Elevator Leading and Trailing Edge E23 Assemble Elevator Leading and Trailing Edges to Elevator E24 Fabricate Elevator Brackets and Fittings E25 Assemble Elevator Brackets and fittings to Elevator E26 Fabricate Elevator Covering or Skins E27 Assemble Elevator Covering or Skins to Elevator E28 Fabricate Elevator Trim Tab E29 Assemble Elevator Trim Tab to Elevator E30 Fabricate Special Tools or Fixtures Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) (Fixed-wing) page 4 of 11

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Appendix 8 E31 Fabricate Vertical Stabilizer Spars E32 Assemble Vertical Stabilizer Spar to the Vertical Stabilizer

E33 Fabricate Vertical Stabilizer Ribs or Cores E34 Assemble Ribs or Cores to Vertical Stabilizer E35 Fabricate Vertical Stabilizer Leading/Trailing Edges E36 Assemble Leading and Trailing Edges to Vertical Stabilizer

E37 Fabricate Vertical Stabilizer Brackets and Fittings E38 Assemble brackets and Fittings to Vertical Stabilizer E39 Fabricate Vertical Stabilizer Cables, Wires, Lines E40 Assemble Cables, Wires, Lines to Vertical Stabilizer E41 Fabricate Vertical stabilizer Empennage Covering or Skin

E42 Assemble Vertical stabilizer Empennage Covering or Skin to Vertical Stabilizer

E43 Assemble Vertical Stabilizer Structure to Fuselage E44 Fabricate Rudder Spar E45 Assemble Rudder Spar to Rudder E46 Fabricate Rudder Ribs or Cores E47 Assemble Rudder Ribs or Cores to Rudder E48 Assemble Rudder Structure E49 Fabricate Rudder Leading and Trailing Edge E50 Assemble Rudder Leading and Trailing Edge to Rudder

E51 Fabricate Rudder Brackets and Fittings E52 Assemble Rudder Brackets and Fittings to Rudder E53 Fabricate Rudder Covering or Skin E54 Assemble Rudder Covering or Skin to Rudder E55 Fabricate Rudder Trim Tab E56 Assemble Rudder Trim Tab to Rudder E57 Assemble Rudder to Vertical Stabilizer Add item:

Add item:

Add item:

Add item:

Total # of Empennage Tasks Empennage Subtotal Mfr Kit/Part/ Component Commercial Assistance Am-Builder Assembly Am-Builder Fabrication Empennage Total Points ► Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) (Fixed-wing) page 5 of 11

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Appendix 8

A B C D FABRICATION AND ASSEMBLY TASKS Mfr Kit/Part/ Commercial Am-Builder Am-Builder Component Assistance Assembly Fabrication Task Landing Gear — 12 Listed Tasks # LG1 Fabricate Struts LG2 Fabricate Brake S ystem Components LG3 Fabricate Lan ding Gear Actuation System Components LG4 Fabricate Lan ding Gear System Cables, Wires and Lines LG5 Assemble Wheels LG6 Asse mble Brakes, Tires LG7 Assemble Landing Gear LG8 Assemble Landing Gear System Components Next Level Structure LG9 Align Landing Gear LG10 Fabricate Landing Gear Fairings/Gear Doors LG11 Assemble Landing Gear Fairings/Gear Doors to Next Level Structure LG12 Perform Landing Gear Op erational Check (Normal, Emergency Systems) Add item:

Add item:

Add item:

Add item:

Total # of Mfr Kit/Part/ Commercial Am-Builder Am-Builder Land Gear Landing Gear Subtotal Component Assistance Assembly Fabrication Tasks Landing Gear Total Points ► Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) (Fixed-wing) page 6 of 11

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Appendix 8

A B C D FABRICATION AND ASSEMBLY TASKS Mfr Kit/Part/ Commercial Am-Builder Am-Builder Component Assistance Assembly Fabrication Task Propulsion — 27 Listed Tasks # P1 Fabricate Engine Mounts(s) P2 Assemble Engine Mount(s) to Next Level Structure P3 Fabricate Engine Cooling System/Baffles P4 Assemble Engine Cooling System Baffles to Engine P5 Fabricate Engine Compartment Overheat/Fire Detection System P6 Assemble Engine Compartment Overheat/Fire Detection System to Engine Compartment P7 Fabricate Induction System P8 Assemble Induction System to Engine P9 Fabricate Exhaust System P10 Assemble Exhaust System to Engine P11 Fabricate Engine Control Installation Brackets P12 Assemble Engine Controls to Next Level Structure P13 Rig and Adjust Engine Controls P14 Fabricate Brackets and Fittings P15 Assemble Brackets and Fittings to Next Level Structure P16 Fabricate Cables, Wires and Lines P17 Assemble Cables, Wires and Lines to next Level Structure P18 Assemble Engine (Likely N/A) P19 Assemble Engine to Engine Mount P20 Fabricate Engine Propeller (Likely N/A) P21 Fabricate Propeller Spinner Components P22 Assemble Propeller to Engine P23 Rig and Track Propeller P24 Fabricate Engine Cowling P25 Assemble Engine Cowling to Airframe P26 Fabricate Engine Fuel System Components P27 Assemble Engine Fuel System Components to Next Level Structure A dd item:

A dd item:

A dd item:

A dd item:

Total # of Mfr Kit/Part/ Commercial Am-Builder Am-Builder Propulsion Propulsion Subtotal Component Assistance Assembly Fabrication Tasks Propulsion Total Points ►

Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) (Fixed-wing) page 7 of 11 8-7

Appendix 8

A B C D FABRICATION AND ASSEMBLY TASKS Mfr Kit/Part/ Commercial Am-Builder Am-Builder Component Assistance Assembly Fabrication Task Cockpit Interior — 11 Listed Tasks # C1 Fabricate Instrument Panel C2 Fabricate Instrument Panel Bracket and Fittings C3 Assemble Instrument Panel with Fittings and Brackets C4 Assemble Avionics to Instrument Panel C5 Fabricate Seats C6 Fabricate Seat Brackets and Fittings C7 Assemble Seats to Cockpit C8 Fabricate Seat Belts Fittings and Shoulder Harness Fittings C9 Assemble Seat Belts and Shoulder Harness to Structure C10 Fabricate Electrical Wiring, Controls and Switches C11 Assemble Electrical Systems Controls and Switches to Next Level Structure Add item:

Add item:

Add item:

Add item:

Total # of Cockpit Mfr Kit/Part/ Commercial Am-Builder Am-Builder Cockpit Interior Subtotal Interior Component Assistance Assembly Fabrication Tasks Cockpit Interior Total Points ► Total # of Aircraft Tasks ◄ SUM #1

Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) (Fixed-wing) page 8 of 11

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Appendix 8

► TOTAL TASKS AND LINE ITEMS ↓ ↓ ↓ ↓

FABRICATION AND ASSEMBLY SUMMARY A B C D Mfr Kit/Part/ Commercial Am-Builder Am-Builder Component Assistance Assembly Fabrication

1. Total Points for Each Category

2. Total Points for Complete Aircraft Construction (SUM #2) ► (SUM # 2 should equal SUM # 1 above.)

3. Percentage of Each Category as Part of Total Aircraft Construction

4. Total Percentages for Complete Aircraft Construction – Add all percentages in row 3. (Total should equal 100% (+ .5%).)

5. Total Builder Points – Add together points in row 1, columns C and D only.

6. Total Builder Percentage – Add together percentages in row 3, columns C and D only.

Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) (Fixed-wing) page 9 of 11

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Appendix 8 8-10 Instructions for Completing the Amateur-Built Aircraft Fabrication and Assembly Checklist (2009)

1. Total Points for Each Category (columns A, B, C and D). Each column’s total points are tallied by adding the sum of the points awarded to the tasks in each section (for example, Fuselage, Wings, Empennage). Include points assigned to additional items in each section. Boxes with a N/A (not applicable) have zero points.

2. Total Points for Complete Aircraft Construction.

SUM #1. To find total points, add up the six “Total # of Tasks” blocks at the bottom left of each fabrication and assembly tasks section.

SUM #2. In the FABRICATION AND ASSEMBLY SUMMARY section, add the four blocks from each column’s category total (columns A+B+C+D).

Compare SUM #1 to SUM #2. SUM #1 should be equal to SUM #2. (Verify the two sums are equal within a deviation of ±0.5). Total points will vary from aircraft to aircraft depending on number of N/As (not applicable), and additional items applied (123 listed task points + additional items - N/As).

3. Percentage of Each Category. To compute percentages, divide each of the point totals in each column (row 1) individually by the number derived in row 2. For example, if the total points of Mfr Kit/Part/Component category (column A) equals 60 and the number in row 2 equals 170, then divide 60 by 170 to equal 35.3 percent. Do this for each category column. Percentages may be rounded to the nearest tenth (for example,

22.86 percent is rounded up to 22.9 percent).

4. Total Percentages for Complete Aircraft Construction as Part of Total Aircraft Construction. Add the percentages of each of the four categories together (columns A+B+C+D). Total must be equal to 100 percent with a deviation limited to ± 0.5 percent. For example, a derived percentage between 99.5 percent and 100.5 percent is acceptable. If this computation falls outside the accepted deviation, then an error has occurred in row 1, 2, or 3.

5. Total Builder Points. Add the two point tallies from column C and column D derived in row 1. Total will vary from aircraft to aircraft depending on number of N/As applied.

6. Total Builder Percentage. Add the two percentage tallies from column C and column D derived in row 3. Total must exceed 50 percent to be eligible for amateur-built status and to meet the major portion requirement under 14 CFR § 21.191(g).

Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) (Fixed-wing) page 10 of 11

Appendix 8 8-11 Explanations and Examples ►A point (each task equals 1 point) can be divided over multiple categories (Manufacturer, Commercial Assistance, Amateur-Builder Assembly, and Amateur- Builder Fabrication) into 1/10 fractions. A manufacturer may be a kit manufacturer, a component manufacturer, or a part(s) manufacturer. Commercial assistance (for hire or compensation) may include assistance provided by kit manufacturers, commercial assistance centers, individuals (for example, A&P mechanics or avionics technicians).

►For example, 0.5 point can be assigned to the manufacturer, 0.3 point as commercial assistance, and 0.2 point to the amateur builder as fabrication, for a total of 1 point.

►All points are added at the end of the form in the FABRICATION AND ASSEMBLY SUMMARY section under their respective categories. The point total is comprised of all the credits awarded for primary delineated tasks plus any credits given for additional items.

►Additional items may be assigned points the same as primary listed tasks if work or parts not reflected in the main entries need to be credited.

►The applicants’ completion of tasks can be documented in a number of ways and may include the following:

 Comprehensive builder’s logs, to include photographs of all the steps included in each of the listed tasks in the Amateur-Builder Aircraft Fabrication and Assembly Checklist (2009), materials and techniques used in construction, as well as dates, locations, and detailed descriptions,  Photographs/video/DVD,  Drawings and engineering specifications,  Kit manufacturer data when necessary,  Relevant documentation (for example, plans) and references (for example, handbooks) used,  Documentation concerning any commercial assistance used,  Documentation concerning any non-commercial assistance used,  Part inventories and histories,  Receipts and Catalogs, and  Logbook entries.

In addition to using this checklist, the builder should document the entire fabrication and assembly process. To issue an airworthiness certificate, the FAA must make a major portion determination (the major portion of an aircraft was fabricated and assembled by an amateur builder(s)). Making this finding requires sufficient, credible, and adequate documentation.

Amateur-Built Aircraft Fabrication and Assembly Checklist (2009) (Fixed-wing) page 11 of 11

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Appendix 9 APPENDIX 9. SAMPLE AERONAUTICAL CENTER FORM 8050-88,

AFFIDAVIT OF OWNERSHIP FOR AMATEUR-BUILT AIRCRAFT Paperwork Reduction Act Statement: The information collected on this form is necessary to ensure applicant eligibility. The information is used to determine that the applicant meets the necessary qualifications as owner of an amateur built aircraft. We estimate that it will take approximately 30 minutes to complete the form. The information collection is required to obtain a benefit. The information collected becomes part of the aircraft registration system.

Please note that an agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB control number. OMB 2120-0042.

Comments covering the accuracy of this burden and suggestions for reducing the burden should be directed to the FAA at 800 Independence Avenue SW, Washington, DC 20591. ATTN: Information Collection Clearance Officer, ABA-20

AFFIDAVIT OF OWNERSHIP FOR EXPERIMENTAL AIRCRAFT INCLUDING

AMATEUR-BUILT AIRCRAFT AND OTHER NON-TYPE CERTIFICATED AIRCRAFT (does not include light-sport) U.S. Identification N130EA Name of Amateur built builder OR Name of Non TC'd manufacturer Early A. Builder Model VAN'S RV-6 Serial Number 1001 Class (airplane, rotorcraft, glider, weight shift control, powered-parachute, etc.) Airplane Type of Engine Installed (reciprocating, turbopropeller,2 or 4 cycle, etc.) reciprocating Number of Engines Installed Manufacturer, Model and Serial Number of each Engine Installed LY-CON, 0-320 EXP., L023-48X Built for Land or Sea Operation Land Number of Seats 2

MUST CHECK ONE

- More than 50% of the above-described aircraft was built from miscellaneous parts and I am the owner. (This option is for amateur-built aircraft.)

More than 50% of the above-described aircraft was built from a kit (prefabricated parts) and I am the owner. The bill of sale from the kit manufacturer is attached. (This option is for amateur-built aircraft.)

I certify that the above-described aircraft is a newly manufactured non-type certificated aircraft and is not currently registered in another country. (This option is for manufacturers only.)

I certify that the above-described aircraft is a previously manufactured (used) non-type certificated aircraft and is not currently registered in another country.

(This option is for owners of previously manufactured aircraft only.)

Evidence of ownership from the aircraft manufacturer through any intervening owners is attached (chain of ownership).

Unable to obtain complete chain of ownership. Statement as to ownership history and whereabouts of aircraft is attached.

Name of Owner: signature of Owner Early Q. Builder Tile of Signe if Appropriate): Early A. Builder 1240 Boi d'Arc Road City: Savoy State: TX Zip: 75479 Telephone: 903-555-1212 Notary Public:

State of: County of:

Subscribed and sworn to before me this day of My Commission Expires:

(Signature of Notary Public) AC FORM 8050-88 (01/07) 9-1

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Appendix 10 APPENDIX 10. SAMPLE AERONAUTICAL CENTER FORM 8050-2,

AIRCRAFT BILL OF SALE UNITED STATES OF AMERICA MD NO. 2R0002 U.S. DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION ADMINISTRATION

KIT ABCRAEL BILL OF SALE THE

UNDERSIGNED OWNER(S) FULL LEGAL

AND BENEFICIAL TITLE OF THE AIRCRAFT DES- CRIBED AS FOLLOWS:

REGISTRATION NUMBER / 130EA UNITED STATES AIRCRAFT MANUFACTURER & MODEL VAN'S RV-6 AIRCRAFT SERIAL No.

1001 DOES THIS DAY OF 20

HEREBY SELL, GRANT, TRANSFER AND

DELIVER ALL RIGHTS, TITLE, AND INTERESTS IN AND TO SUCH AIRCRAFT UNTO: Do Not Write In This Block

FOR FAA USE ONLY

NAME AND ADDRESS (IF INDIVIDUAL(S), GIVE LAST NAME, FIRST NAME, AND MIDDLE INITIAL.)

PURCHASER BUILDER, Early A. 1240 Bois d' Arc Road Savoy, IX 75479

DEALER CERTIFICATE NUMBER

AND TO EXECUTORS, ADMINISTRATORS, AND ASSIGNS TO HAVE AND TO HOLD

SINGULARLY THE SAID AIRCRAFT FOREVER, AND WARRANTS THE TITLE THEREOF IN TESTIMONY WHEREOF HAVE SET HAND AND SEAL THIS DAY OF 20

NAME (S) OF SELLER SIGNATURE (S) TITLE (TYPED OR PRINTED) (TYPED OR PRINTED)

FOR CO-OWNERSHIP, ALL MUST SIGN.)

SELLER VAN'S CKNOWLEDGMENT (NOT REQUIRED FOR PURPOSES OF FAA RECORDING: HOWEVER, MAY BE REQUIRE / LOCAL LAW FOR VALIDITY OF THE INSTRUMENT ORIGINAL: TO FAA AC Form 8050-2 (9/92) (NSN 0052-00-629-0003) Supersedes Previous Edition 10-1

Appendix 11

APPENDI X 11. SAMPLE LETTER FOR REQUESTING AN AIRCRAFT REGISTRATION NUMBER UNDER 14 CFR § 47.15 [Insert Date] Federal Aviation Administration Aircraft Registration Branch, AFS-750 P.O. Box 25504 Oklahoma City, OK 73125-0504 Sir/Madam:

This is a request for a U.S. identification number assignment for my amateur-built aircraft.

Aircraft Description:

Make/Builder: Early A. Builder Type (airplane, rotorcraft, glider, or balloon): Airplane Model: VAN’S RV-6 Serial Number: 1001 This aircraft has not previously been registered anywhere (reference 14 CFR § 47.15(a)(1)).

X Normal Request ($5); fee attached (check or money order) X Special Registration Number Request ($10); fee attached (check or money order) Choices 1st 130EA 2nd 130JR 3rd 130FE 4th 130JJ 5th 130TX Sincerely, Early A. Builder Early A. Builder Owner 11-1

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Appendix 12 APPENDIX 12. SAMPLE FAA FORM 8130-12,

ELIGIBILITY STATEMENT, AMATEUR-BUILT AIRCRAFT OME NO. 2120-01 Instructions: Print or type all information except signature ELIGIBILITY STATEMENT Submit original to an authorized FAA representative US Department of Transportation AMATEUR-BUILT AIRCRAFT Applicant completes Section I thru III. Notary Public cera vation Completes Section IV.

Administration I. REGISTERED OWNER INFORMATION Name(s) Early A. Builder Address(es) - 1240 Bois d'Arc Road Savoy TX 75479 No. & Street City State Zip Telephone No (s) (999)555-1212 (214) 555-1212 Residence Business II. AIRCRAFT INFORMATION Model VAN'S RV 6 Engine(s) Make _ LY-CON 0-360 EXP Assigned Serial No. 1001 Engine(s) Serial No. _ L 023-48X Registration No. N130EA Prop./Rotor(s) Make _ Sensenich Aircraft Fabricated: Plan • Kit X Prop./Rotor(s) Serial No.(s) C2YK-1BF/F7661B4 III. MAJOR PORTION ELIGIBILITY STATEMENT OF APPLICANT I certify that the major portion of this aircraft (identified in Section Il above) was fabricated and assembled by Early A. Builder, Son O. Builder Names of all builders (Please Print) solely for my (our) education or recreation, in accordance with 14 CFR part 21, Certification Procedures for Products and Parts, §

21.191(g), Operating amateur-built aircraft. I have records to support this statement and will make them available to the FAA upon request.

During the fabrication and assembly of this project, I/ we used the following commercial assistance (mark N/A if no commercial assistance was used):

N/A Name of company or individual(s) City & State Phone N/A Name of company or individual(s) City & State Phone -NOTICE- Whoever in any matter within the jurisdiction of the executive, legislative, or judicial branch of the Government of the United States, knowingly and willfully falsifies, conceals or covers up by any trick, scheme, or device a material fact, or who makes any materially false, fictitious or fraudulent statement or representation, or makes or uses any false writing or document knowing the same to contain any materially false, fictitious or fraudulent statement or entry, shall be fined under this title, imprisoned not more than 5 years or, if the offense involves international or domestic terrorism, imprisoned not more than 8 years, or both.

(U.S. Code, Title 18, Sec. 1001) understand the Privacy Act statement that accompanies this form.

Signature of Applicant (In Ink) Date 8/1/2009 Early A. Builder IV. NOTARIZATION STATEMENT FAA Form 8130-12 (08-2009) Su NSN: 0052-00-889-9002 12-1