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 8 weeks and eventually achieve the reengineering of the shop floor in… 6,5 days!



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 and has been since June 2020 Head of Infrastructure and Operational Maintenance at Safran Aerosystems.


He accepted to share his experience of Critical Chain Project Management during the TOCICO conference dedicated to the method Critical Chain 2020.


To learn more about Critical Chain Project Management: