DOA Design Office Part 21J
Our DOA (Design Organisation Approval) EASA Part 21.J approval allows Aerotec & Concept to design, certify and manage aeronautical modifications and repairs for all types of aircraft and helicopters. We transform your operational needs into certified aeronautical solutions, with flight tests and management of necessary authorizations.
Our Approvals
EASA PART 21J.362
GCAA DOA.171
EASA approvals are recognized by many authorities worldwide and therefore do not require additional certifications in the countries concerned.
Key figures
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modifications delivered
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aircraft modified
What is DOA and why is it essential?
- Authority delegated by EASA to design and approve major or minor modifications
- Development of certified alternative repairs
- Guarantee of regulatory compliance, safety and reliability
Our team: your guarantee of expertise
- A team of designers: engineers in structures, cabins, avionics, mechanics and systems
- More than 15 internal CVEs (Compliance Verification Engineers) dedicated to compliance verification
- Maximum speed and rigor in the approval process
Services & Capabilities
- STC & Service Bulletins: systems integration, avionics retrofit, cabin reconfiguration, connectivity
- Permit to Fly
- Flight tests
Domains & aircraft
- Commercial aircraft
- Business aviation
- General aviation
- Helicopters
- Government & Defense
Deliverables
- Complete certification package
- Safety analyses
- Ground and flight test reports
- Manuals and Service Bulletins
Use cases
- Aircraft transition: cabin modification, livery, safety compliance and re-registration
- Passenger experience enhancement: wifi installation, external connectivity, in-flight entertainment (IFE)
- Mission systems (aircraft or helicopter): design and certification of your projects
Achievements
Annual modifications and certifications of new cabin configurations on A320, B737 up to A380, VIP aircraft and helicopters
STCs obtained in 2025 for installation of SATCOM OneWeb solutions on the A320 family
Selected to develop and modify ATR72 and A319 into firefighting aircraft
DOA + POA + MRO + CAMO Integration: an Aerotec & Concept synergy
The combination of our DOA, POA, MRO and CAMO approvals enables complete management of your fleet, from design to maintenance.
FAQ
A Supplemental Type Certificate (STC) is an official approval for a major modification to an aircraft, issued by the authority (EASA/GCAA).
Yes, our DOA issues and manages the flight authorizations required for tests and ferry flights.
Minor: low impact on airworthiness (e.g.: panel color change). Major: impact on performance, flight limitations or safety (e.g.: new avionics system installation).
Our experience allows us to optimize coordination with EASA to reduce timelines as much as possible. The minimum observed time is approximately 5 months.
Yes, thanks to our GCAA certification and bilateral agreements, our modifications can be recognized by many foreign authorities.
