a. The user shall perform an assessment of the system or equipment contamination sensitivity;
b. The user shall identify the contamination sources onboard;
c. The user shall evaluate, in accordance with ECSS-Q-70-01, the expected contamination levels or quantities present in critical areas, assessing the mechanisms of transport and fixation of contaminants.
d. The user shall define the modelling requirements and where quantitative levels are required use a physical outgassing and contamination transport model.
NOTE 1 No specific outgassing and contamination transport model is defined as requirement. The physical model, given in Annex K can be used for the analyses in all cases.
NOTE 2 When the spacecraft is not sensitive, outgassing modelling can be based on VCMtest results [RD.23], [RD.24], differentiating between CVCM (low vapour pressure, condensable material) for room temperature range and TML (sum of condensable and noncondensable material) for cryogenic applications.
NOTE 3 For information, tools with different level of complexity, which treat outgassing and contamination are given in Annex K.