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essential function

Standard

ECSS-E-ST-20C Rev.1

Definition

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

Notes

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.

Relations

ECSS-E-ST-32C Rev. 1 — failure
ECSS-Q-ST-70-45C — failure
ECSS-S-ST-00-01C — failure
ECSS-M-ST-10C Rev. 1 — function
ECSS-S-ST-00-01C — function
ECSS-E-ST-35C Rev. 1 — spacecraft
ECSS-S-ST-00-01C — spacecraft

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