Major Repair or Alteration (Form 337)
Need a major aircraft repair or modification? Penn Air Repair specializes in major repairs and alterations, complete with properly prepared FAA Form 337 documentation to ensure your aircraft remains airworthy and compliant.
Aviation Services
What is a Major Repair or Alteration (Form 337)?
Certain types of aircraft repairs and modifications are classified as 'major' by the FAA. These require completion of Form 337 — a legal document that describes the work performed and confirms that it was completed to FAA standards. Our team at Penn Air Repair has the experience and expertise to perform these repairs properly and handle all required paperwork for you.
When is Form 337 Required?
Form 337 must be filed when performing major repairs or alterations that can affect the aircraft’s structural integrity, performance, flight characteristics, or compliance with airworthiness standards. Some examples include:
- Structural Repairs – Repairs to wings, fuselage, empennage, or other primary structures.
- Avionics Upgrades – Installation of modern avionics systems that alter original equipment.
- Landing Gear Modifications – Conversions from fixed to retractable gear, or other major gear alterations.
- Engine Changes – Upgrades to higher horsepower engines or conversions from one model to another.
Why Choose Penn Air Repair for Major Repairs & Form 337?
Our FAA-certified team has the experience to complete major repairs and modifications to the highest standards, with full compliance to FAA documentation and regulations.
- FAA Certified Repair – All work performed by FAA-certified technicians and IAs.
- Proper Documentation – Accurate and complete Form 337 preparation and filing.
- Custom Solutions – We work with you to find the right solution for your aircraft and needs.
- Commitment to Quality – Your safety and airworthiness are our top priorities.
Need a Major Repair or Alteration?
Contact Penn Air Repair today to discuss your project. Our team will guide you through the process and ensure your aircraft remains compliant, safe, and ready to fly.
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