ARIANE 5 Upper-Stage EPS Ignition Conditions Improvement, and Return to operation with Envisat Mission

Details ARIANE 5 Upper-Stage EPS Ignition Conditions Improvement, and Return to operation with Envisat Mission ARIANE 5 Upper-Stage EPS Ignition Conditions Improvement, and Return to operation with Envisat Mission

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.788d&link_type=abstract

IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,

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ARIANE 5 experienced a flight anomaly with the 10th model mission, having placed its both satellites in a too low orbit than the planned GTO. Only one satellite could be retreived due to its own propulsion systems. Arianespace, CNES and Astrium-GmbH (former DaimlerChrysler Aerospace Dasa) immediately set up a recovery team, combining forces for carrying deep and schedule- sustained investigations and qualifying recovery measures. This paper presents and summarises the methodology applied for investigations and recovery programme, and the main findings which came out. The investigation fields are presented, showing how failure analysis, engineering investigations and basic research have been combined in order to have a schedule and methodic efficient approach. The combination of the largest possible European resources in space vehicle design has been implemented, involving industry, agency technical centers and research laboratories. The methodology applied has been driven by the particular situation of a flight anomaly investigation, which has to take into account the reduced amount of measurement available in flight and the necessary combination with ground test data for building a strategy to reach identification of possible failure scenario. From the investigations and from extensive sensitivity characterisation test of EPS engine (AESTUS) ignition transient, stability margins have been deeply investigated and main lessons learnt are summarised. The identification and implementation of recovery measures, extended as well to potential ignition margin reduction factors even beyong the observed flight anomaly allowed to establish a robust complementary qualification status, thus allowing resuming of operational flight, starting with the valuable Envisat payload.

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