Faa form 337 2026

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The document outlines the requirements and procedures related to the Paperwork Reduction Act for information collection by the Federal Aviation Administration (FAA). It includes details about mandatory reporting for major repairs and alterations of aircraft, specifies the necessary OMB Control Number, and provides instructions for completing FAA Form 337. The form is required by law and failure to comply may result in civil penalties.

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Click ‘Get Form’ to open FAA Form 337 in the editor.
Begin by filling out the 'Aircraft' section. Enter the Nationality and Registration Mark, Serial Number, Make, Model, and Name as shown on the registration certificate. Ensure that the address matches the one on your registration certificate.
Next, complete the 'Owner' section with the owner's details including City, State, Zip Code, and Country.
In 'Unit Identification', specify whether it is a Repair or Alteration. Fill in details such as Unit Make, Model, and Serial Number as described in Item 1.
Proceed to the 'Conformity Statement'. Indicate the agency's name and address along with the Certificate Number of the authorized individual certifying that repairs/alterations comply with regulations.
Finally, complete the 'Approval for Return to Service' section by providing inspection details and signatures from authorized individuals.
If necessary, describe any work accomplished in detail in Section 8. Attach additional sheets if required.

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What is FAA form 337 for?

Form FAA 337 - Major Repair and Alteration (Airframe, Powerplant, Propeller, or Appliance)

What is a form 337 used for?

The person who performs or supervises a major repair or major alteration must 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, airframe, powerplant, propeller, appliance, or a component part thereof.

Can an AP fill out a 337?

If you replace the engine and wing vs repair them then no 337 needed. If repairing and depending how the repair is classified, an AP with Inspection Authorization (IA) is needed to sign the 337. As to applicant, it usually is the AP performing the repair and/or the IA who approves it for return to service.

When to execute FAA form 337?

FAA Form 337 will be executed in duplicate with one signed copy given to the aircraft owner and one copy forwarded to the FAA within 48 hours after the airframe, aircraft engine, propeller, or appliance is installed on an aircraft and approved for return to service.

What is a STC supplemental type certificate used for?

A Supplemental Type Certificate (STC) is a document issued when an applicant has received approval from the Federal Aviation Administration (FAA) to modify an aircraft from the original design.

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What is the difference between form 337 and stc?

(Airframe, Powerplant, Propeller, or Appliance) An STC is a more robust standard than a simple Form 337 that requires more engineering and proof that the intended modifications result in an airworthy plane.

What is the difference between STC and 337 form?

An STC is a more robust standard than a simple Form 337 that requires more engineering and proof that the intended modifications result in an airworthy plane. In many cases, an STC includes a supplement to the POH or flight manual that notates the changes and identifies how they affect aircraft performance.

Do you need a 337 for an STC?

STC Approval Once receiving certification, the MRO issues the return to service FAA Form 337. This document includes information about the STC development and notifies the FAA that the installation is complete.

Faa form 337 2026

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