Critical Chain 2020 - Guillaume Brethenoux, Head of Infrastructure and Operational Maintenance at Safran

Complete factory layout change in 6.5 days!


Safran Electronics & Defense (SAE) in Mantes-la-Ville is a factory of 300 people that make Flight Control Systems. They have 2 main production departments: Machining and Assembly. The facility initially had a low level of OTD (On Time Delivery); less than 50%. So, huge amounts of work-in-progress, inability to give reliable delivery dates to customers, management team busy firefighting …


Convinced that the situation was critical, they  decided to deploy Theory of Constraints. This reduced the Work In Progress by over 85%. They then decided to change the plant layout, simplifying the production flow and organizing machines by product families. The target of the new layout was to help in further reduce lead times, simplifying the flow of parts and increasing global productivity… Around 48 machines needed to be moved without disturbing the production flow.


Guillaume Brethenoux, Maintenance Manager in charge of this project used the Critical Chain Project Management approach to challenge the initial planning of 5 weeks and eventually achieve the reengineering of the shop floor in… 6,5 days!


Guillaume Brethenoux.

From June 2020 - Head of Infrastructure and Operational Maintenance at Safran Aerosystems.

July 2014- June 2020: Industrial Maintenance and General Services Manager at Safran Electronic & Defense.

November 2011 – July 2014: Maintenance Manager at Groupe Renault:

October 2000 – January 2004: Co-Design of gearbox Pilot - PSA Peugeot Citroën.

During 20 years, Guillaume Brethenoux, an INSA ROUEN Engineer, gathered experience in automotive industry at PSA Peugeot Citroen then with Groupe Renault as Maintenance Manager. He joined the Safran Group in 2014.



To enhance your experience, Marris Consulting organizes training sessions on Theory Of Constraints applied to production and projects environments


Critical chain project management training

Marris Consulting, expert in Theory of Constraints & Critical Chain Project Management


Marris Consulting is an expert in the Theory of Constraints (ToC) and Critical Chain Project Management (CCPM). As industry consultants, we are focused on helping process and manufacturing industries reach their highest levels of performance by using Constraints Management  combined with Lean and Six Sigma. We also use Critical Chain Project Management which we sometimes combine with Lean engineering to improve project performance. If you are unsure about the actions which need to be implemented to improve operational efficiency, our industrial management consultants can also conduct a performance audit. Furthermore, our experts host numerous Theory of Constraints (ToC), lean and project management training sessions throughout the year.

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About Marris Consulting

Marris Consulting is an industry consulting and training company specialized in the Theory of Constraints (ToC) and Critical Chain Project Management. We focus on improving the performance of manufacturing and process industries by using Constraints Management combined with Lean and Six Sigma. To boost project performance, we also use Critical Chain Project Management (CCPM), which we sometimes combine with Lean Engineering. Our 2-day performance audits, our performance consulting services and our project management, Lean, ToC & CCPM training by our industry consultants offer a wide range of solutions to help our clients around the world reach the highest possible levels of performance.

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