Safran Transmission Systems The world leader in mechanical power transmission systems
Safran Transmission Systems is the world leader in mechanical power transmission systems for commercial and military aircraft. With over 45,000 products delivered to date, the company holds 60% of the global market for mainline commercial jets (over 100 seats).
Accessory drive trains for aircraft engines
The accessory drive train (ADT) is a mechanical assembly comprising a system of gears and shafts that taps some of the engine’s power and transfers it to the key subsystems and equipment that help keep the engine (oil system, fuel system, electrics) and the aircraft (electric and hydraulic systems) performing as they should.
Aircraft-mounted accessory gearboxes
The aircraft-mounted accessory gearbox drives the equipment that generates the electrical power needed by airplane and helicopter systems.
Reduction gearboxes for airplane and helicopter engines
The reduction gearbox is a major module in the propulsion system and is part of the drivetrain between the gas generator and the propeller. It lowers the rotation speed between the engine output and the main propellor gearbox, while transmitting all of the engine’s mechanical power.
Research and technology
Our engineers and technicians design and develop breakthrough technologies and the next-generation power transmission architectures that will help make flying greener.
Materials and processes
Our mechanical power transmission systems are constantly being improved with the introduction of new materials and processes, such as machining from solid and additive manufacturing.
Our teams use computer-aided mechanical design tools and 3D modeling to design and develop technical solutions to meet the evolving requirements of engine manufacturers.
To develop the maturity and robustness of the new technologies designed and developed by our teams, they build prototypes to test these major innovations.
Our testing center reflects our commitment to ensure that the development of new power transmission technologies and architectures includes rigorous altitude and endurance testing.
Our teams implement and manage robust manufacturing processes in order to meet the cost, quality and on-time delivery requirements of our customers.
Manufacture and assembly
Building on the experience gained with more than 45,000 ADTs, our expertise spans all aspects of gear production, and we offer different procedures for manufacturing casings, from casting to solid machining.
Services and support
As an original equipment manufacturer (OEM), we offer specific repair solutions to meet the needs of each customer, from parts supply to by-the-hour support contracts.
Safran Transmission Systems in Poland, a key link in the chain of Safran’s engineering expertise
Safran Transmission Systems Poland specializes in the production and assembly of major modules for aircraft engines, including the power transmission systems for the Boeing 737 and Airbus A320. The company actively contributes to the success of the CFM56 and LEAP programs. Working closely with the Technical University of Rzeszow, Safran Transmission Systems Poland is a dynamic company focused on continuous improvement. The company’s on-time delivery and quality performance earns regular kudos from its customers, and it has established its reputation within Safran and “Aviation Valley”, a region of southeast Poland known for its engineering know-how.
Aero Gearbox International
Formed in 2015, Aero Gearbox International brings together the expertise and experience of its two parent companies: Safran Transmission Systems in the design, production and maintenance of mechanical power transmission systems, and Rolls-Royce for aircraft engines and systems integration. Based on a 25-year, renewable partnership, the company is the exclusive supplier of these systems for all future commercial aircraft engines made by Rolls-Royce. One of the joint venture’s first products was the accessory drive train for the Trent 7000 engine powering the Airbus A330neo. It has facilities in Colombes (near Paris), Derby (UK), Dahlewitz (Germany) and Ropczyce (Poland).
Focus on innovation: additive manufacturing
Additive manufacturing is an alternative to the traditional casting process. Instead of removing material by machining, it involves adding only the necessary material. Safran Transmission Systems designs gears and cases using the selective laser melting (SLM) method.
Also known as 3D printing, additive manufacturing is a real innovation driver and offers a number of advantages: it helps overcome design constraints in order to reduce weight and decrease the number of constituent parts, which in turn lowers production costs. And because part design is entirely digital, right through to printing, we can make prototypes much faster.
Focus on innovation: reduction gearboxes
With our experience in propeller speed reduction units for turboprop engines and our overall expertise in propulsion systems, Safran Transmission Systems has naturally begun developing the high-power reduction gearboxes for the next generation of very-high-bypass-ratio engines.
A multidisciplinary team of over 100 engineers and technicians is designing and developing the breakthrough technologies for these future gearboxes. Safran Transmission Systems also operates an experimental production center and a test facility where we develop, produce and trial these new technologies and the various potential architectures to bring the best possible solutions to market.
Our rating on gender equality
0 94 / 100
Gender pay gap39/40
Allocation of individual increases20/20
Difference in the distribution of promotions15/15
Number of employees increased upon return from maternity leave15/15
Parity among top 10 earners5/10
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Search our certifications and approvals
AQAP 2110 D - Safran Transmission SystemsDownload
CAAC 145 – Safran Transmission SystemsDownload
Certificate chemical processing Safran Transmission SystemsDownload
Certificate heat treatment Safran Transmission SystemsDownload
Certificate non destructive testing Safran Transmission SystemsDownload
CFR Part 145 - Safran Transmission SystemsDownload
Chargeur connu - Safran Transmission Systems CertificateDownload
EASA Part 145 - Safran Transmission Systems (french only)Download
EASA Part 145 / 14 CFR Part 145 Capability ListDownload
EASA Part 21-G - Safran Transmission Systems (french only)Download
EN 9100 : 2018 - AS 9100:D-JISQ9100:2016 - Safran Transmission SystemsDownload
ISO 9001 : 2015 - Safran Transmission SystemsDownload
Non-Destructive Testing Certificate - Safran Transmission Systems 2022Download
market share for commercial jets with over 100 seats
of revenues invested in R&D
power transmission systems delivered
billion flight-hours with our power transmission systems
airlines and operators use our equipment
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