337 form example 2026

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  1. Click ‘Get Form’ to open the 337 form in the editor.
  2. Begin with Item 1, where you will enter the aircraft's Make, Model, and Serial Number. This information can be found on the manufacturer's identification plate.
  3. In Item 2, provide the complete name and address of the aircraft owner as shown on AC Form 8050-3.
  4. For Item 3, leave it blank for now; this section is for FAA use only and will be filled out later based on approval status.
  5. Proceed to Item 4 to identify the unit that has been repaired or altered. Fill in relevant details about the airframe, powerplant, propeller, or appliance.
  6. In Item 5, indicate whether the unit was repaired or altered by checking the appropriate box.
  7. Complete Item 6 by entering your agency's name and address, checking your type of agency, and providing your certificate number.
  8. For Item 7, after inspection, check either 'approved' or 'rejected' based on findings and sign accordingly.
  9. Finally, in Item 8, describe the work accomplished clearly and concisely. If more space is needed, attach additional sheets.

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A field approval is the granting by an FAA airworthiness safety inspector of an FAA approval for a major repair or major alteration based on examination of data or physical inspection or testing. There are three kinds of field approvals for which the local FAA inspector can sign off in Block 3 of the FAA Form 337.
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.
If the alteration is minor, the approval can be done by any licensed AP mechanic. However, if the alteration is deemed to be major, it requires a mechanic with an Inspection Authorization (IA), in order to sign the approval block on the 337 form and submit it to the FAA.

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