If you own or operate an aircraft, you have probably come across the term “Part 145 repair station” at some point. Maybe your mechanic mentioned it, maybe you saw it on an invoice, or maybe you are shopping for a new maintenance provider and keep seeing the phrase in marketing materials. Either way, understanding what a Part 145 repair station actually is, and why it matters, can help you make smarter decisions about where your aircraft gets serviced.
This guide breaks down the FAA certification process, explains the rating and class system, and covers what aircraft owners should look for when choosing a Part 145 facility for maintenance, inspections, and repairs.
Understanding FAA Part 145 Certification
A Part 145 repair station is a maintenance facility that holds a certificate issued by the Federal Aviation Administration under Title 14 of the Code of Federal Regulations (14 CFR) Part 145. That certificate authorizes the facility to perform maintenance, inspections, and alterations on aircraft and aircraft components. In the broader aviation industry, these facilities fall under the umbrella of maintenance, repair, and overhaul (MRO) operations, a category that spans everything from routine inspections to full engine rebuilds.
The key distinction is in the return-to-service authority. Plenty of shops have skilled mechanics and quality equipment, but without a Part 145 certificate, they are approving an aircraft or component for return to service after maintenance with their own A&P Certificate. At a Part 145 Repair Station, technicians sign off their work under the repair station, which includes a specified inspection process to ensure that at least two people have inspected the work accomplished prior to returning the aircraft to service. This added safety measure is an exponential value added to the integrity of your aircraft’s maintenance.
Part 145 certification is not handed out loosely. The FAA requires applicants to demonstrate that they have the housing, facilities, equipment, trained personnel, and technical data necessary to perform the work they are seeking approval for. The process typically takes 12 to 24 months and includes multiple phases of documentation, inspection, and FAA oversight before a certificate is issued.
The Six FAA Repair Station Ratings
Not every Part 145 repair station does the same work. The FAA organizes repair station capabilities into six general ratings, each covering a different category of aircraft components or systems.
Airframe covers the physical structure of the aircraft itself. This rating is divided into four classes based on aircraft size and construction material, including categories for small and large composite aircraft as well as small and large metal aircraft.
Powerplant focuses on engines. There are three classes under this rating, two for reciprocating engines (split by horsepower) and one for turbine engines. Functional and equipment requirements for turbine engines are governed by the manufacturer’s recommendations.
Propeller authorizes work on propellers and their governors. Classes are divided between fixed-pitch and constant-speed propellers across wood, metal, and composite construction types.
Radio covers communication, navigation, and radar systems. This includes everything from radio transmitting and receiving equipment to emergency locator transmitters and weather radar.
Instrument pertains to flight instruments and is divided into classes for mechanical, electrical, gyroscopic, and electronic instruments.
Accessory is a broad category that covers mechanical, electrical, and electronic components that are installed on or attached to the aircraft but are not part of the airframe, engine, or propeller. Think fuel system components, hydraulic pumps, and electronic control units.
Class Ratings vs. Limited Ratings
Within each of the six general ratings, the FAA issues either class ratings or limited ratings depending on the scope of work the facility can demonstrate.
A class rating is issued to repair stations that can show the capability to maintain a representative number of makes and models within that rating category. A facility with a class rating has broader authorization and is not restricted to specific aircraft types or manufacturers.
A limited rating, on the other hand, is issued when a facility maintains or alters only a particular type of airframe, engine, propeller, radio, instrument, or accessory. A limited rating may be restricted to a specific make, model, or even a specific maintenance function. For example, a shop might hold a limited rating that authorizes it only to perform plasma spray operations on a certain manufacturer’s turbine blades.
For aircraft owners, the practical takeaway is straightforward. When evaluating a Part 145 facility, ask what ratings and classes they hold and confirm that those ratings cover the specific work your aircraft needs. A shop’s Operations Specifications document, issued by the FAA, will spell out exactly what the facility is authorized to do.
Often, this information can be found readily available on the company’s website.
What a Part 145 Repair Station Must Maintain
Earning a Part 145 certificate is only the beginning. The FAA requires certified repair stations to maintain ongoing compliance with a long list of operational standards. These include keeping personnel, facilities, equipment, and materials at or above the level required at the time the certificate was originally issued.
Every Part 145 facility must maintain current manufacturers’ service manuals, instructions for continued airworthiness, and service bulletins for the articles it works on. The facility must also have an approved repair station manual and a quality control manual that outline procedures, responsibilities, and inspection protocols.
The FAA conducts ongoing surveillance of certified repair stations to verify continued compliance. If a facility falls below standards, the FAA can take action ranging from additional oversight to suspension or revocation of the certificate.
Why FAA Maintenance Standards Matter for Aircraft Owners
Choosing a Part 145 repair station is not just about checking a regulatory box. It is about knowing that the facility working on your aircraft has been independently verified by the FAA to meet specific standards for staffing, training, equipment, documentation, and quality control.
When you bring your aircraft to a certified facility, you can expect that technicians are working with current technical data from the manufacturer, that the shop has the correct tooling and test equipment for the job, and that a documented quality control process is in place to catch errors before your aircraft is approved for return to service.
For owners who fly under Part 91 or Part 135, using a Part 145 repair station also simplifies compliance. Maintenance records, inspection sign-offs, and return-to-service approvals from a certified facility carry weight with insurance providers, prospective buyers, and FAA inspectors alike.
How Heritage Aviation Meets Part 145 Standards in Vermont
Heritage Aviation in South Burlington, Vermont has held its FAA Part 145 repair station certificate for over 30 years, earning the FAA’s Diamond Award for maintenance excellence along the way. Located at Patrick Leahy Burlington International Airport, the facility provides aircraft maintenance, avionics services, and fixed-base operations under one roof.
As a 100% employee-owned company and certified B Corporation, Heritage Aviation brings a different level of accountability to the work. Every technician on the team is a shareholder, which means quality is personal. That ownership mentality, combined with over 80 years of combined avionics experience and proximity to the Pratt & Whitney Canada engine service center, makes Heritage a strong choice for aircraft owners across the Northeast.
Vermont also offers a practical financial advantage for aircraft repair. There is no sales tax on aircraft parts or labor in the state, which can add up to meaningful savings on major maintenance events, avionics upgrades, and annual inspections.
What to Look for When Choosing a Part 145 Facility
Not all Part 145 repair stations are created equal. Here are a few things to consider when evaluating a facility for your aircraft maintenance needs.
Start with ratings and classes. Confirm that the shop holds the specific ratings required for the work your aircraft needs. If you fly a Cirrus, for instance, you want a facility with the appropriate airframe and powerplant authorizations, ideally one that is a Cirrus Authorized Service Center like Heritage Aviation.
Ask about experience with your aircraft type. A broad Part 145 certificate is valuable, but hands-on familiarity with your specific make and model matters just as much. Heritage Aviation, for example, has deep experience on King Air’s, Citations and Cirrus Aircraft.
Look at the facility itself. A well-maintained, properly equipped shop is a strong indicator of how the team will treat your aircraft. Heritage Aviation operates from a LEED Gold certified facility that utilizes wind and solar energy, a green roof, and rainwater harvesting, reflecting the same attention to detail they bring to maintenance work.
Consider location and logistics. A facility with on-site U.S. Customs, proximity to engine service centers, and a full-service FBO can make the maintenance experience significantly more convenient, especially if you are flying in from out of state or across the Canadian border.
The Role of Quality Control in Part 145 Operations
One of the most important aspects of the Part 145 framework is the quality control system. Every certified repair station must have a documented quality control program overseen by a designated inspector. This program covers incoming inspections of parts and materials, in-process inspections during maintenance work, and final inspections before an aircraft or component is approved for return to service.
The quality control manual is a living document that the FAA regularly audits. It outlines the specific inspection procedures, acceptance criteria, and corrective action processes that the facility follows. For aircraft owners, this means there is a structured system in place to catch issues before they leave the shop.
At Heritage Aviation, quality control is reinforced by the employee-ownership model. When every technician has a financial stake in the company’s reputation and long-term success, there is a built-in incentive to get every job right the first time.
Common Maintenance Services Performed at Part 145 Facilities
The scope of work at a Part 145 repair station varies by facility, but most full-service shops handle a wide range of maintenance tasks. These commonly include annual inspections, 100-hour inspections, progressive inspections, Airworthiness Directive compliance, Service Bulletin compliance, engine line maintenance, propeller overhauls, and component repair or replacement.
Many Part 145 facilities also offer avionics services, including installation of new equipment, IFR certifications under FAR 91.411 and 91.413, RVSM certifications for light aircraft through business jets, and bench-level troubleshooting and repair.
Part 145 vs. Part 43: What is the Difference?
Aircraft owners sometimes confuse Part 145 with Part 43. They are related but serve different purposes. Part 43 of the Federal Aviation Regulations establishes the standards for how maintenance, preventive maintenance, and alterations must be performed on aircraft. It applies to everyone who works on aircraft, regardless of the type of certificate they hold.
Part 145, on the other hand, governs the certification and operation of repair stations specifically. A Part 145 repair station must perform all of its work in accordance with Part 43 standards, but Part 145 adds an additional layer of facility, personnel, and quality control requirements on top of that baseline.
Think of Part 43 as the rulebook for how to do the work correctly, and Part 145 as the certification framework that verifies a facility has the infrastructure, people, and processes to do that work at scale and approve it for return to service.
Schedule Your Next Maintenance Visit at Heritage Aviation
Whether you are looking for a new maintenance provider or want a second opinion on your current setup, Heritage Aviation’s FAA-certified Part 145 repair station in South Burlington, Vermont is here to help. With over 30 years of experience, Diamond Award-winning maintenance, Cirrus Platinum Partner status, and no Vermont sales tax on parts or labor, we make it easy to keep your aircraft safe, airworthy, and ready to fly.
Contact the Heritage Aviation maintenance team today at (877) 326-5288 or visit flyheritage.com/ to schedule your consultation.
