SHT-145 Approved Maintenance Organizations

Approved Maintenance Organizations (AMOs) under SHT-145, are technical organizations authorized by the General Directorate of Civil Aviation to perform maintenance services on civil aircraft or their components. These organizations play a critical role in ensuring the sustainability of aviation safety and are obligated to conduct their activities in full compliance with national and international regulations.

The authorization supervision and operational regulation of these organizations are primarily based on the Regulation on Approved Aircraft Maintenance Organizations and the accompanying Instruction on Approved Aircraft Maintenance Organizations which provides detailed implementation guidelines.

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The SHY-145 Regulation, published in the Official Gazette, establishes the necessary qualifications for public institutions private companies and legal entities to obtain the status of an approved maintenance organization for civil aircraft. This legal framework defines the standards for technical infrastructure personnel competence and quality management systems of such organizations.

The SHT-145 Instruction serves as complementary legislation that regulates the technical administrative and operational requirements for granting and conducting approved aircraft maintenance activities under the Continuing Airworthiness Regulation (SHY-CA).

The SHT-145 regulations are periodically updated in line with international developments and safety standards in the dynamic aviation sector. Compliance with standards set by the European Union Aviation Safety Agency and the International Civil Aviation Organization forms the primary driver of these updates. For instance findings from the ICAO USOAP CMA inspection conducted in September 2024 necessitated revisions to the regulatory framework.

Furthermore amendments to the European Commission Regulations 2021/1963 2022/1360 and 2025/111 as well as EASA-issued Acceptable Means of Compliance and Guidance Material have been integrated into the current versions of the SHT-145 Instruction. This integration aims to ensure alignment of Türkiye’s civil aviation system with global aviation authorities.

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Organizations authorized under SHT-145 provide a broad range of technical services beyond routine maintenance to ensure the continuous airworthiness of civil aircraft. The authorization system is structured to cover both domestic and foreign maintenance organizations. The General Directorate of Civil Aviation classifies and registers these organizations as Approved Domestic Maintenance Organizations and Approved Foreign Maintenance Organizations.

The scope of authority granted to each organization varies depending on the type of aircraft or components for which maintenance is undertaken. An organization may be approved for comprehensive aircraft maintenance or for specific components such as engines avionics systems or landing gear.

The supervision inspection and administrative processes for SHT-145 approved maintenance organizations are carried out by the Airworthiness Directorate within the General Directorate of Civil Aviation. This directorate continuously monitors compliance with regulations and acts in a regulatory capacity to prevent situations that could compromise aviation safety. The regulatory development process takes into account input from industry stakeholders and internal institutions and is managed through a participatory approach. Relevant instructions are publicly communicated through SHGM’s official communication channels.