Leading Solutions for Aviation Industry

Innovative designs, certifications, and consulting for global aerospace needs.

We are DOA

S4A is the first company in Spain granted as Design Organization by EASA.

Most relevant STC’s

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Challenger 604 NEW
ISAT 110/200 SATCOM installation Aviator 350 SATCOM installation Aviator 350 SATCOM installation Epishuttle installation

ISAT 110/200 SATCOM installation

EASA STC nº. 10063155

Order STC

Aviator 350 SATCOM installation

EASA STC no. 10064011

Order STC

Aviator 350 SATCOM installation

EASA STC no. 10064011

Order STC

Epishuttle installation

EASA STC nº. 10077113

Order STC


Global Express BD-700-1A10 New
Iridium antenna installation Cabin Management system & LOPA change Aviator 350 SATCOM installation

Iridium antenna installation

EASA STC nº. 10083617

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Cabin Management system & LOPA change

EASA STC nº. 10079001

Order STC

Aviator 350 SATCOM installation

EASA STC no. 10047490

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Explore our catalogue of STC’s, Supplementary Type Certificates that transform your needs into certified solutions.

Aircraft Modifications

Our expertise lies in designing and certifying both minor and major (STC’s) aircraft modifications. STC’s are certified by EASA and may be validated by other authorities (FAA, etc).

Aerospace Testing

A history of excellence in producing comprehensive test plans, procedures, and execution for aerospace industry needs.

Aircraft Repairs

Expertise in designing repairs for both metallic and composite materials, covering structural damages, as well as functional and decorative aspects.

Turnkey Aviation Projects

Comprehensive solutions from design, installation, to global certification of aircraft repairs and modifications.

Mastering EASA/FAA validations

We expertly navigate the cross-approval of aircraft modifications, ensuring your FAA-approved changes are EASA-validated, and the other way around. By customer’s request, our modifications can be certified in front other certification authorities (Transport Canada, Bermuda, Isle of Man, San Marino, etc)

Aerospace Consulting

Offering time-bound or ongoing aerospace consulting by a dedicated team of industry experts.

Excellence in aeronautical engineering

Projects Delivered

Satisfied Clients

If you want to enjoy the advantages of S4A,
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our approvals

EN ISO 9001 – Quality Management

EN 9100 – Aerospace Standards

EASA Part 21J DOA – Trusted Certification






Projects carried out

Aircraft models

We deliver projects in more than 50 countries

Amelia International


Thank you very much for this AOG action and excelletn support / work!!! This is what it counts when we work with such a great team and company!!

Wish you the best weekend ahead!


 Airworthiness Engineer

IAI’s Heron TP makes splash at ILA ahead of German army operations

Israel Aerospace Industries (IAI) is exhibiting at the ILA Berlin air show as its Heron TP system nears entry into service with the German military.

German Chancellor Scholz announces surprise order for 20 more Eurofighters

German Chancellor Olaf Scholz used the opening day of the ILA Berlin air show to announce a surprise order for 20 more Eurofighter combat aircraft.

“Lexi, Book Me a Jet”: How AI in Aviation is Evolving

At EBACE 2019, industry experts examined the growth of artificial intelligence (AI) in aviation and how it will evolve in the future.

Business aviation bosses stay upbeat on net-zero ambitions

Industry leaders have doubled down on the sector’s environmental commitments, citing ongoing investment in emission-reducing technologies in a bid to reach net-zero by 2050.

Business Aviation Sustainability Aided By European Research

Sitting in the crosshairs of "flight shaming" and other anti-air travel protests, business aviation is the sector most in need of sustainable solutions but—because of its high-performance requirements—is the most challenging commercial market to decarbonize.

Brisbane 2032 Olympics vertiport concept designs released

Australian vertiport developer Skyportz released today images for riverfront vertiport concepts on the Brisbane River at the annual Advanced Air Mobility summit on the Gold Coast.


Helicopters are facing a growing threat of air collision from “uncooperative” drones operating in the lower layers of the airspace. The development of an anti-collision system is now a priority to ensure flight safety, both in the military and civilian world.

ACH160 takes starring role for Airbus Corporate Helicopters

Airbus Corporate Helicopters has given a leading role to its newest star at this year’s EBACE, with the ACH160 medium-twin taking centre stage on its show stand.

More Airlines Reviewing Safety Protocols After SQ321 Incident

The number of turbulence incidents reported by airlines has increased, although severe turbulence remains rare, the International Air Transport Association said at its annual meeting on June 3. By The Straits Times, Singapore / Asia News Network Source (TNS)

Diehl flags future role of new materials and AI in aircraft cabins

While Diehl Aviation was at AIX highlighting the potential for artificial intelligence and recycled materials to bring further innovation to future aircraft cabins, the company’s senior vice-president product innovation Carsten Laufs flags many of the gains are...

Values that set us apart.



We strive every day to offer more competitive prices.


Our team manages military deadlines and ways of working.


We adapt all our work to the client’s needs.

Turnkey projects

From design to manufacture and installation.

Close and decisive

Whenever you need us, we will be there regardless of the time or day of the week.