EPC H173
| Tips | kriogēnā raķešpakāpe |
| Dzinējs | Vulcain 2 (1 gab.) |
| Vilkme | 1350 kN (vakuumā) |
| Pilna masa | 185 500 kg |
| Sausmasa | 14 100 kg |
| Diametrs | 5,46 m |
| Garums | 30,50 m |
| Degviela | H2 / LOX |
EPC H173 jeb Étage Principal Cryogénique H173 (no franču - kriogēnā pirmā pakāpe) - nesējraķešu Ariane 5 pamata raķešpakāpe.
Pakāpe izmantota Ariane 5 versijās:
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