Tag Archive for: EASA

Is your Boeing 737NG cabin configurations in compliance with EASA regulations?


In response to the Certification Memorandum CM–21.A–CS–001 Issue 02, titled “Classification Of Design Changes To Cabin Interiors Of Large Aeroplanes,” released by EASA in April 2021, AES has successfully secured six Supplemental Type Certificates (STCs) for various seat type configurations on the Boeing 737NG, covering both 186 and 189 passenger configurations. Notably, the most recent STC covers the Safran Z100 series in a 189 configuration (STC Nr 10083547). AES is actively pursuing additional STCs, with several applications currently in progress.

The Certification Memorandum clarifies classification of changes to Cabin Interiors including the installation of seats that require a compliance statement against CS25.562, focusing on Emergency Landing Dynamic Conditions. It’s worth noting that this requirement has been a longstanding part of EASA Part 21 Appendix A of GM 21.A.91. However, with the release of CM–21.A–CS–001, EASA has clarified and reinforced the classification process for such changes, superseding past practices.

A key aspect highlighted in accordance with EASA B737 Type Certificate Data Sheet (TCDS) IM.A.120 is that most seating configurations for the B737NG family must meet the requirements for JAR25 Chapter 13, excluding certain clauses. This mandates the classification of these changes as Major (STC). It is important to mention the requirement provided in CS26.60 (Additional Airworthiness Specifications), which requires dynamically tested seats to be installed in configurations manufactured post-26th February 2021 to be compliant with CS25.562.

AES remains committed to delivering aerospace engineering solutions that not only meet but exceed regulatory requirements, ensuring the highest standards of safety and compliance in the aviation industry. For further details on these achievements, interested parties are encouraged to contact us below.

Aerospace Engineering Solutions maintains excellence in DOA audits with the European Union Aviation Safety Agency (EASA) and General Civil Aviation Authority (GCAA). We are pleased to report that both audits were highly successful, further solidifying AES’s standing as a mature and competent DOA. The Design Organisation Approval Team Leader (DOATL) specifically commended AES, stating,

Special merit should be mentioned for the mature methodology in place and the technical competence shown by the team in our scope of activity.

These audits represent a continuous achievement for the company and validate the effectiveness of our Design Management System in ensuring that our approvals are kept up to date and aligned with the latest regulations. Please check our about page for more information.

An aircraft lessor or airline typically looks for certain qualities in a DOA holder and there are many factors they consider important:

  • Compliance: The DOA holder should have a strong track record of compliance with regulatory requirements and standards set by aviation authorities. This ensures that the designs and modifications performed by the DOA meet safety and airworthiness standards.
  • Expertise and Experience: The lessor or airline will value the DOA’s expertise and experience in aircraft design, modification, and engineering solutions. A proven track record of successfully completed projects and a team of skilled professionals contribute to the DOA’s credibility.
  • Technical Capabilities: The DOA should possess the necessary technical capabilities and infrastructure to handle the lessor’s or airline’s specific requirements. This includes having appropriate design tools, software, testing facilities, and qualified personnel.
  • Flexibility and Responsiveness: The lessor or airline would prefer a DOA that can adapt to their needs and provide timely responses. Flexibility in accommodating modifications, efficient communication, and prompt delivery of design solutions are valued traits.
  • Cost-Effectiveness: While quality and compliance are crucial, the DOA’s pricing and cost-effectiveness also play a role. The lessor or airline will consider the overall value proposition, including the DOA’s pricing structure and competitiveness in the market

Ultimately, the Aircraft Lessor’s DOA expectations is to provide reliable, compliant, and cost-effective engineering solutions, ensuring the airworthiness and safety of their aircraft fleet.

Feedback from our customers is that AES meets all the above requirements and has been a trusted DOA partner, supporting aircraft lessors and airlines for over 20 years. We’re an extension of your team, offering expert assistance to help you soar higher. Contact our team today!

Explore our comprehensive Part 21J DOA services and wide range of aerospace products.

International Women in Engineering Day 2023 (INWED) is a global initiative celebrated on June 23 each year, dedicated to recognising the achievements of women in engineering and inspiring the next generation of female engineers. It is a day to reflect on the progress made towards gender equality in the engineering field and to reaffirm our commitment to supporting and empowering women in this industry.

One of our outstanding employees, Lola Lahoz Nogales, Deputy of Head of Airworthiness & Design Office Manager in Spain, has consistently demonstrated a deep commitment to empowering women in engineering. Her unwavering support and advocacy have significantly encouraged more women to pursue careers in the traditionally male-dominated field. Lola has catalysed positive change through mentorship programs, career development initiatives, and engaging outreach activities.

In this short video clip, part of the International Federation of Airworthiness ‘Why I chose …’ series of films, Lola shares why she chose aviation engineering for her career and how her passion for airworthiness has developed.

International Women in Engineering Day 2023 – Click here to view the film.