essential function


ECSS-E-ST-20C Rev.1


function without which the spacecraft cannot be recovered following any conceivable on-board or ground-based failure


  • NOTE Examples of unrecoverable spacecraft is when spacecraft cannot be commanded, or permanently losses attitude and control, or the energy balance is no longer ensured, or the spacecraft consumables (e.g. hydrazine or Xenon) are depleted to such an extent that more than 10% of its lifetime is affected, or the safety of the crew is threatened.
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