14 CFR Part 145: Repair Station Ratings, Manuals, and Certification

14 CFR Part 145 is the federal regulation that governs certificated repair stations, setting the requirements a facility must meet to legally perform maintenance, preventive maintenance, or alterations on aircraft, engines, propellers, appliances, and component parts. The Federal Aviation Administration uses Part 145 to hold every certificated shop to the same standards for scope of work, housing, tools, personnel, training, manuals, quality control, records, and reporting. Nothing a station touches can be approved for return to service unless the station and the work satisfy these rules.

Ratings Define What the Station Can Do

A Part 145 certificate is only meaningful in combination with the ratings issued alongside it. Ratings tell the station, its customers, and FAA inspectors exactly what articles the station is authorized to work on. The FAA issues ratings in six categories: airframe, powerplant, propeller, radio, instrument, and accessory. Each category is broken into numbered classes that narrow the scope further, for example separating reciprocating engines by horsepower from turbine engines within the powerplant rating.¹

The FAA can also issue a limited rating that restricts the station to specific makes, models, or specialized services such as nondestructive inspection or landing gear work. A station holding a limited rating must keep a capability list identifying each article it can service by make and model, and that list must be acceptable to the FAA. Before adding anything new to the list, the station has to perform a self-evaluation showing it has the housing, equipment, personnel, technical data, and training to do the work.²

Housing, Facilities, and Equipment

Subpart C requires the station to provide housing consistent with its ratings, with enough room to segregate and protect articles throughout maintenance. Painting, welding, cleaning, avionics work, and machining have to be separated so those activities do not contaminate or interfere with other work in progress. Ventilation, lighting, and climate control must let personnel do the work to regulatory standards, and new parts stocked for installation must be kept physically separate from articles undergoing maintenance. A station can perform work at a location outside its primary housing only if the FAA accepts the location and it meets the same facility requirements.³

Every tool and material needed for work under the certificate must be on the premises and under the station’s control while the work is being done. The manufacturer’s recommended equipment is the baseline, and the FAA will accept equivalents. Any test or inspection equipment used to make an airworthiness determination has to be calibrated to a standard acceptable to the FAA. The station also has to keep current technical data accessible whenever relevant work is underway, including airworthiness directives, instructions for continued airworthiness, maintenance and overhaul manuals, service bulletins, and any other FAA-approved or accepted data.⁴

Personnel

Every station must designate a repair station employee as the accountable manager. That person is the primary point of contact with the FAA and bears responsibility for keeping the operation in compliance. The station must also employ enough qualified people to plan, supervise, perform, and approve for return to service all the maintenance under its certificate, and it must evaluate each employee’s abilities and assign work accordingly under Part 43 standards.⁵

Inspection personnel are held to a higher bar. They must be thoroughly familiar with the applicable regulations and with the inspection methods, techniques, and equipment used to determine airworthiness. They must be proficient with the inspection tools appropriate to the article they inspect, and they must understand, read, and write English.⁶

Training Program

Every station has to have an FAA-approved training program covering initial and recurrent training, and the program must ensure each employee assigned to perform maintenance or inspections can competently do the work. The program is submitted during the application and must be kept current for the life of the certificate. Training records must be documented in a format acceptable to the FAA, retained for at least two years, and available for inspection. Revisions go to the station’s responsible Flight Standards office.⁷

Drug and Alcohol Testing

Stations employing people in safety-sensitive functions, which includes aircraft maintenance, must comply with the FAA’s drug and alcohol testing requirements under 14 CFR Part 120 and 49 CFR Part 40. The program is activated through the A449 operations specification paragraph obtained from the principal maintenance inspector, and it must be in place no later than the date safety-sensitive work begins. Required testing categories are pre-employment, reasonable cause or suspicion, random, post-accident, return-to-duty, and follow-up. A verified negative pre-employment drug test must come back before the individual starts safety-sensitive work. The station must also provide drug and alcohol education and train supervisors to recognize when reasonable-suspicion testing is warranted.

The Two Governing Manuals

Two documents run the day-to-day operation, and both must be acceptable to the FAA before the certificate is issued.

The Repair Station Manual is the operational blueprint. It has to be prepared, followed, kept current, and accessible to all personnel required under Subpart D. It contains the organizational chart, the roster of managing and supervisory personnel, internal procedures, and the framework for how the station interacts with the FAA. Procedures within it must align with FAA-approved data so the maintenance work carries legal weight.⁸

The Quality Control Manual, required under Section 145.211, sets the inspection procedures for incoming parts, in-process checks, and final return-to-service approvals. If the station holds a limited rating, the manual must also describe how the station performs the self-evaluation before adding articles to its capability list.² Together the two manuals produce the paper trail that proves every article approved for return to service went through the required steps.

Contract Maintenance

A Part 145 station is not required to do every function in-house. Under Section 145.217, work can be contracted to an outside source, but only if the FAA has approved the specific function for outsourcing. The station has to keep a record of the functions it contracts and the facilities it uses, and make that information available to its Flight Standards office.⁹ Regulatory responsibility does not travel with the work. The certificated station still approves the article for return to service, so its quality control has to reach into the contractor’s output just as thoroughly as its own. A list of functions the station intends to contract out is required with the initial application.¹⁰

Extra Duties When Working for Air Carriers

Holding a Part 145 certificate is not the whole story if the customer is an air carrier. A station performing maintenance for a Part 121 or Part 135 carrier must follow that carrier’s continuous airworthiness maintenance program and the applicable sections of its maintenance manual, on top of the station’s own procedures. A station doing inspections for a Part 125 operator must follow that operator’s FAA-approved inspection program, and the same principle applies to work on U.S.-registered aircraft flown by foreign carriers under Part 129. Line maintenance for a carrier is only allowed when the station has the equipment, trained personnel, and technical data for it, and the authorization is written into its operations specifications.¹¹

Records and the 96-Hour Reporting Clock

Maintenance records must demonstrate compliance with Part 43, be written in English, be in a format acceptable to the FAA, and be kept for at least two years from the date the article was approved for return to service.¹² Training records carry their own two-year retention under Section 145.163.⁷

When the station discovers a serious failure, malfunction, or defect in an article, it must report it to the FAA within 96 hours. The report includes the aircraft registration number, the type and make of the article, the date of discovery, the nature of the failure, time since last overhaul, and the apparent cause, to the extent that information is available.¹³ The clock runs from discovery, not from the end of a root-cause investigation, so the station needs a system in place to file promptly while analysis is still underway.

How to Apply for a Certificate

Certification starts with FAA Form 8310-3, the Application for Repair Station Certificate and/or Rating.¹⁴ The form is really the cover sheet. Under Section 145.51 the application must include:

A Repair Station Manual meeting Section 145.207.
A Quality Control Manual meeting Section 145.211.
A list of each article the station intends to service, by type, make, or model.
An organizational chart naming managing and supervisory personnel by title.
A description of the housing, including its physical address.
A list of maintenance functions the station plans to contract out under Section 145.217.
A training program meeting Section 145.163.

All equipment, personnel, technical data, and facilities must be in place and ready for FAA inspection when the agency evaluates the application. The one carve-out: equipment does not have to be physically on-site at initial certification if the applicant has a contract acceptable to the FAA with another entity to supply it when needed. Applicants outside the United States must show that certification is necessary to maintain U.S.-registered aircraft or foreign-registered aircraft operating under Part 121 or Part 135, and they must pay an FAA-prescribed fee.¹⁰

Before the FAA will issue the certificate to a U.S.-based station, the applicant has to certify in writing that all employees handling hazardous materials, including those of contractors and subcontractors, are trained under 49 CFR Part 172 Subpart H. Stations outside the United States meet the equivalent standard through ICAO Technical Instructions training.¹⁵

Once the application is submitted, FAA inspectors examine the facility, tools, equipment, personnel, and technical data to verify everything meets Subparts A through E. Applicants who meet the requirements receive the repair station certificate with appropriate ratings, along with operations specifications defining the scope and any limitations on their authority. Discrepancies found during the site visit have to be corrected before the certificate can issue.¹⁵

How Long the Certificate Lasts, and What Can End It

A domestic repair station certificate has no expiration date. It remains in effect until the FAA suspends or revokes it, or the station voluntarily surrenders it. A certificate issued to a station located outside the United States has a fixed duration and must be renewed, and the FAA may decline renewal if the station has not operated in compliance with Part 145 during the preceding certificate period. A station whose certificate is suspended or revoked, whether domestic or foreign, must return it to the FAA.¹⁶

Violations also carry civil penalties under 49 U.S.C. 46301. A company or other entity can be assessed up to $75,000 per violation. An individual or small business concern faces up to $10,000 per violation for offenses under Chapter 401, which is where the Part 145 requirements sit.¹⁷ Because penalties are assessed per violation, a single inspection that surfaces several deficiencies can escalate quickly, which is why compliance functions best as a daily discipline rather than an audit-week scramble.

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eCFR. 14 CFR 145.59 – Ratings
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eCFR. 14 CFR 145.215 – Capability List
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eCFR. 14 CFR 145.103 – Housing and Facilities Requirements
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eCFR. 14 CFR 145.109 – Equipment, Materials, and Data Requirements
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eCFR. 14 CFR 145.151 – Personnel Requirements
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eCFR. 14 CFR 145.155 – Inspection Personnel Requirements
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eCFR. 14 CFR 145.163 – Training Requirements
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eCFR. 14 CFR 145.207 – Repair Station Manual
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eCFR. 14 CFR 145.217 – Contract Maintenance
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eCFR. 14 CFR 145.51 – Application for Certificate
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eCFR. 14 CFR 145.205 – Maintenance, Preventive Maintenance, and Alterations Performed for Certificate Holders Under Parts 121, 125, and 135, and for Foreign Air Carriers or Foreign Persons Operating a US-Registered Aircraft in Common Carriage Under Part 129
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eCFR. 14 CFR 145.219 – Recordkeeping
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eCFR. 14 CFR 145.221 – Service Difficulty Reports
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Federal Aviation Administration. Instructions for Completing FAA Form 8310-3 Application for Repair Station Certificate and/or Rating
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eCFR. 14 CFR 145.53 – Issue of Certificate
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eCFR. 14 CFR 145.55 – Duration and Renewal of Certificate
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Office of the Law Revision Counsel. 49 USC 46301 – General Civil Penalties