101 • Thermoelastic effects have to be well considered from the beginning of the design, especially for  devices with wide operation range.   • Adaptation to typical electrical interfaces of customers is important to reach the market.   • The development of many variants of a new product in parallel is really difficult to handle in terms of  cost, time and risk. It would be recommended to develop a first variant and then develop the rest of  them.   • Testing as early as possible during the development is k ey to find potential issues and problems.   • A good definition of tooling and its interface with the thermal chambers is critical to reach good thermal  cycling and to save time and money during test cycles.   • EGSE sometimes is as critical as the flight dev ice. The risk associated to poorly designed electrical  equipment may compromise the integrity of the devices, with the consequent impact.   • EGSE can be a sub- product of the activity. It is an important asset to improve the market access of  REACT, reducing the costs and complexity of customers to test the new product.   • It is important to tune the shock with a representative device prior to qualification, in order to avoid  excessive levels during test. It is important to keep high frequency responses within limits.   • It is needed to improve the clarity of the documentation shared with customers. The requirements for  assembly of the unit into the system and its use (adjustment of electrical pulses for different  conditions) is critical.   • It is a good practice to offer guidance to customers for the adaptation of their designs to the  characteristics of the product.  

Finally, there is a list of lessons learned  coming from the users’ experiences, where collaboration between  partners has been key for the identificat ion of requirements, issues and the evolution of the product:   • Better definition of critical points in user manuals, to avoid any misunderstanding that may lead to  handling or operation errors. These manuals were tuned after the first users experiences.   • Implementation of a quick user guide to summarize the most critical points for the use of REACT.   • Elaboration of white notes to guide the users in the particularities of the device and its integration in  systems.   • Evolution of the test setups to be offered to customers as EGSE. It will allow easier use of the devices  in addition to reduce the adoption time for customers.   • It is important to collaborate with customers to ensure a proper design and use of the equipment.   • Improvement of key details description in ICDs.  

Currently, REACT qualification campaign is ongoing for some models and different milestiones for each  model have been accomplished:   • REACT 5kN Standard Temperature has reached flight heritage as part of eSAIL mission in 2020.   • REACT 5 kN Extended Temperature has also reached flight heritage in two missions in 2019.   • REACT 15kN Standard Temperature has succesfully completed its qualification.   • REACT 15kN Extended Temperature model is in the middle of qualification campaign and has  already been selected for several flight missions.   • REACT 35kN Standard and Extended Temperature are running their qualification campaigns.  

Acknowledgement  

The project showed in this work has received funding from the European Union’s Horizon 2020 research  and innovation program under grant agreement No 640241 (project REACT –  Resettable Hold- Down and  Release ACTuator).