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What is DAH in Aviation? (Design Approval Holder (Easa))

Updated: February 21, 2024

Design Approval Holder (EASA)

The Design Approval Holder (DAH) is a crucial entity in the aviation industry, responsible for the design and certification of aircraft, components, and systems. In Europe, the European Union Aviation Safety Agency (EASA) is the governing body that grants design approval to aviation manufacturers. This article will delve into the role of the Design Approval Holder (EASA) and its significance in ensuring the safety and airworthiness of aircraft.

The Responsibilities of a Design Approval Holder (EASA)

As a Design Approval Holder (DAH) under the authority of EASA, the primary responsibility is to ensure that the design of an aircraft, component, or system complies with all applicable airworthiness standards and regulations. This involves a rigorous process of design, testing, and certification to guarantee the safety and reliability of aviation products.

One of the key responsibilities of a Design Approval Holder (EASA) is to develop and maintain a Design Organization Approval (DOA). The DOA is granted by EASA and authorizes the holder to perform design activities, such as modifications and repairs, on aircraft and their components. It allows the DAH to take full control of the design process, ensuring compliance with relevant regulations and standards.

Furthermore, a Design Approval Holder (EASA) is responsible for managing the airworthiness of their products throughout their lifecycle. This includes conducting regular inspections, monitoring the performance and reliability of the design, and addressing any potential safety issues that may arise. The DAH must also keep detailed records of design changes and modifications, ensuring traceability and accountability.

Collaboration with EASA and Regulatory Compliance

The Design Approval Holder (EASA) works closely with the European Union Aviation Safety Agency to ensure compliance with regulatory requirements. EASA provides oversight, guidance, and certification to DAHs, ensuring that their designs meet the highest standards of safety and airworthiness.

Before a design is approved, the DAH must submit a comprehensive certification plan to EASA, detailing the design process, testing procedures, and compliance with applicable regulations. EASA reviews this plan and conducts audits and inspections to ensure that the design meets all necessary requirements.

Once the design is approved, the Design Approval Holder (EASA) must adhere to the approved design data and implement any necessary changes or modifications in compliance with EASA regulations. The DAH is also responsible for reporting any significant design changes to EASA and obtaining their approval before implementing them.

It is essential for a Design Approval Holder (EASA) to maintain a strong working relationship with EASA, as any changes in regulations or standards may impact the design approval and require further compliance. Regular communication and collaboration with EASA help ensure that the DAH stays up to date with the latest requirements and maintains the airworthiness of their products.


The Design Approval Holder (EASA) plays a critical role in the aviation industry by ensuring the safety and airworthiness of aircraft designs. As a DAH, they are responsible for designing, testing, and certifying aviation products in compliance with EASA regulations. The collaboration between the DAH and EASA is crucial to ensure that designs meet the highest standards of safety and to address any potential issues that may arise throughout the lifecycle of an aircraft.

By fulfilling their responsibilities and maintaining a strong working relationship with EASA, the Design Approval Holder (EASA) contributes to the overall safety and reliability of the aviation industry. Their attention to detail, compliance with regulations, and commitment to airworthiness are fundamental in ensuring the protection of passengers, crew, and the public.

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