The high failure rate of the three and four stage rocket meant that the project was cancelled.

[4][5] On November 29, 1968, its inaugural flight, the Astris third stage exploded.

[6][7] On the third attempt on June 11, 1970, the stage performed correctly, but the fairing failed to separate.

[7][6] On November 5, 1971, the Europa II launched from CSG ELA-1, had a mishap due to structural failure of the third stage.

[4] Propellant (N2O4/Aerozine-50) mass was 2760 kg, and the single Astris engine produced 23.3 kN of thrust.