DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
Subject: INSTRUCTIONS FOR COMPLETION OF FAA FORM 337 (OMB NO. 2120-0020),
MAJOR REPAIR AND ALTERATION (AIRFRAME POWERPLANT, PROPELLER, OR
APPLIANCE)
Date: 5/21/87
Advisory Circular No: 43.9-1E
Initiated by: AFS-340
Change:
1. PURPOSE. This advisory circular (AC) provides instructions for completing Federal Aviation
Administration (FAA) Form 337, Major Repair and Alteration (Airframe, Powerplant, Propeller, or
Appliance).
2. CANCELLATION. AC 43.9-1D, instructions for Completion of FAA Form 337 (OMB
04-R0060 Major Repair and Alteration (Airframe, Powerplant, Propeller, or Appliance), dated
9/5/79, is canceled.
3. RELATED FEDERAL AVIATION REGULATIONS (FAR) SECTIONS. FAR Part 43,
Sections 43.5, 43.7, 43.9, and Appendix B.
4. INFORMATION. FAA Form 337 is furnished free of charge and is available at all FAA Air
Carrier (ACDO), General Aviation (GADO), Manufacturing Inspection (MIDO), and Flight
Standards (FSDO) district offices, and at all International Field Offices (IFO). The form serves two
main purposes; one is to provide aircraft owners and operators with a record of major repairs or
alterations indicating details and approval, and the other is to provide the FAA with a copy of the
form for inclusion in the aircraft records at the FAA Aircraft Registration Branch, Oklahoma City,
Oklahoma.
5. INSTRUCTIONS FUR COMPLETING FAA FORM 337. The person who performs or
supervises a major 'repair or major alteration should prepare FAA Form 337. The form is executed
at least in duplicate and is used to record major repairs and major alterations made to an aircraft, an
airframe, powerplant, propeller, appliance, or spare part. The following instructions apply to
corresponding items 1 through 8 of the form as illustrated in Appendix 1.
a. Item 1 - Aircraft. Information to complete the "Make," "Model," and "Serial Number"
blocks will be found on the aircraft manufacturer's identification plate. The "Nationality and
Registration Mark" is the same as shown on AC Form 8050-3, Certificate of Aircraft
Registration.
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