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Fillable FAA Form 337 – Major Repair & Alteration

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Fillable FAA Form 337 – Major Repair & Alteration

The FAA Form 337, also known as the "Major Repair and Alteration" form, is required whenever an aircraft undergoes a major repair, a major alteration, or a change in the operating limitations. This form documents the work performed, certifies that it meets FAA standards, and must be signed by an authorized mechanic or repair station.

Using our fillable PDF version saves you time and eliminates the need for printing, scanning, or hand‑writing. Simply click the "Fill out this form" button, enter the required information, and download the completed document ready for submission.

Below you’ll find step‑by‑step instructions, common pitfalls to avoid, and answers to the most frequently asked questions about Form 337.

FAQ
  • What types of work require FAA Form 337?

    Any major repair, major alteration, or change to the operating limitations of an aircraft must be documented on Form 337.

  • Can I submit the fillable PDF electronically?

    Yes. After completing the form, you can email the PDF to the designated FAA office or upload it through the FAA’s electronic submission portal if applicable.

  • Who is authorized to sign Form 337?

    A certified A&P mechanic, repair station, or other FAA‑authorized individual must sign and certify the work.

  • Do I need to print the form for the FAA?

    The FAA accepts both printed and electronic copies. If you choose to print, use high‑quality paper and ensure signatures are legible.

  • How often is Form 337 updated?

    The current edition expires on 07/31/2026. Always use the latest version available on the FAA website or via our fillable PDF.

  • What common mistakes should I avoid?

    Missing signatures, incorrect aircraft registration numbers, and leaving optional fields blank when they are required for your specific repair are the most frequent errors.

  • Is there a fee to file Form 337?

    Filing the form itself is free, but you may incur charges for the repair work or for any required FAA inspections.

  • Can I edit the PDF after I download it?

    Yes, you can reopen the downloaded PDF in the Formize PDF Filler app to make additional edits before final submission.

HVORDAN

Sådan udfylder du FAA Form 337 gratis online i 6 nemme trin:

  1. 1
    Open the Fillable Form
    Click the **Fill out this form** button on the page. The Formize PDF Filler app will launch in your browser.
  2. 2
    Load the Form
    Wait a few seconds while the fillable FAA Form 337 loads. No download is required.
  3. 3
    Enter Required Information
    Complete all mandatory fields such as aircraft registration, description of work, dates, and signatures. Use the tab key to move quickly between fields.
  4. 4
    Validate Your Entries
    The Formize app checks for missing or incorrectly formatted data. Correct any highlighted errors before proceeding.
  5. 5
    Save or Download
    When all sections are complete, click **Save** to store the PDF in your cloud storage or **Download** to get a local copy for printing and submission.
  6. 6
    Submit to the FAA
    Send the finished Form 337 to the appropriate FAA office or repair station according to the instructions on the form.
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