The new Vinci upper stage engine is being tested in test rig P4.1 at the DLR site in Lampoldshausen as part of the Ariane 6 programme. This campaign is an important milestone for the development of future European launchers; their flexibility will be greatly enhanced with the re-ignitable engine. DLR conducted hot running tests on Vinci under space conditions using self-developed steam generators. During this test, the engine was ignited three times and can burn for up to 820 seconds during an experiment in a vacuum at less than six millibars. A maximum of five ignitions are possible. The test campaign began on 4 May, 2016 and will last until September 2016. The first launch of an Ariane 6 is planned for 2020.