LA PLATA, Maryland — Europe’s new Vega-C medium-lift rocket, grounded since December after it failed on its second mission, is unlikely to return to flight this year following an issue with a test firing of its newly designed second-stage engine.
Vega-C prime contractor Avio SpA said the test firing of the Zefiro-40 motor, designed to last for 97 seconds, lost pressure after 40 seconds for reasons not yet known.
The test firing of the Zefiro-40 was ordered by an . . .
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