Appendix A‐I: Abbreviations and Acronyms

AAAF Association Aéronautique et Astronautique de France: French Aeronautical and Astronautical Association ABA Ammonia boiler assembly ACRC Assured crew return capability ACRV Assured crew return vehicle ACS Altitude control subsystem AEG Allgemeine Elektricitäts-Gesellschaft (German industrial) AFITEP Francophone Project Management Association ALFLEX Automatic landing flight experiment (Japan) ALT Approach and atmospheric landing tests AMD Avions Marcel Dassault AOC Autonomous operating capability AOS Acquisition of signal APM Attached pressurized module (later called CAL and COF) APMC Attached Pressurized Module Centre APU Auxiliary power unit AR5 or A5 Ariane 5 ARCAS AvionRecalage des CharacteristiquesAerodynamiques Subsoniques: Subsonic Aerodynamic Characteristics Calibrating Plane ARD Atmospheric reentry demonstrator ARLM Ariane 5 logistics module ARV Advanced return vehicle ASH Avion spatial Hermes (Hermes spaceplane) ASI Agenzia Spaziale Italiana: Italian Space Agency ASSET Aerothermodynamic/elastic structural systems environmental tests (US Air Force) ATCS Active thermal control subsystem ATTAS Advanced technologies testing aircraft system (DLR)