NPR 8705.2, Human Rating Requirements for Space Systems was updated to reflect current agency policies. Revision C included changes to improve accountability throughout the Human-Rating certification process, clarification of the scope of human-systems integration analyses, clarifications regarding the failure tolerance requirement and more explicit involvement of the crew safety representatives.

The most significant changes include

• The associate administrator will serve as the single endorsement of the certification package at the Preliminary Design Review
• Clarification as to when ground personnel are included in specific human-systems integration analyses
• Clarification of the failure tolerance requirement to be at least single failure tolerant
• Clarification that it is structural failure of pressurized lines that are exempt from the failure tolerance requirement and not all failures of these lines
• More consistent and explicit inclusion of the Johnson Space Center director, as the crew representative, in determining the acceptability of risk to the crew

Questions can be directed to Alfredo Colón.