System Safety & Mission Assurance (SS&MA) for Sub-Class D Missions Steve Jara NASA Ames System...
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Transcript of System Safety & Mission Assurance (SS&MA) for Sub-Class D Missions Steve Jara NASA Ames System...
System Safety & Mission Assurance (SS&MA)
for Sub-Class D Missions
Steve Jara
NASA Ames System Safety & Mission Assurance Division
SS&MA: A set of system safety and quality management processes that minimize the risk associated with each system and phase of a project’s life cycle. They are normally executed by/with:
• Independent experts (not responsible for the project’s cost/schedule)
• A high degree of independent verification & validation (V&V)
• A flow-down of requirements throughout the supply chain
• A closed-loop root cause analysis based corrective action system
• A de-emphasis on their impact to project cost & schedule
Sub-Class D Missions: Low budget fast paced projects executed under a set of streamlined processes aimed at mitigating only the most significant risks to mission success. They are normally executed by/with: • An atmosphere of innovation & creativity
• Cross-trained thinly spread teams (with limited oversight)
• A high percentage of COTS & low heritage parts
• A high degree of reliance on vendor SS&MA processes
• An open-loop “make-it-work” corrective action system
• An emphasis on cost & schedule
Why apply SS&MA on Sub-Class D Missions?
• Traditional arguments against:• Stifles innovation & creativity (rules based)
• Too costly & time consuming
• Unnecessary when risk of mission failure is acceptable
• The real story; SS&MA is critical to mission success:• Tailorable, flexible, & identifies where rules are good
enough or where innovation is required
• Cost can be limited to initial risk assessments followed by the mitigation of the most significant risk
• Ensures projects allocate their limited resources judiciously and intelligently
Mission failure is not acceptable due to blindly/poorly applied processes; SS&MA provides critical insight & intelligence
Specifically, with respect to safety, SS&MA• Helps project’s understand & comply with applicable safety
requirements• Range
• Payload Safety Working Group
• Launch provider (via Interface Control Documents)
• Generates required safety documents• Verifies supporting evidence and closure to supporting documents
• Champions a safe working environment during all phase of the project life cycle
Specifically, with respect to mission assurance, SS&MA• Helps project’s understand & comply with applicable quality
requirements, including but not limited to:• ISO9001/AS9100 Quality Management
• Workmanship
• EEE parts
• Generates required quality documents• Verifies supporting evidence and closure to supporting documents
• Champions a “do it right the first time” working environment during all phases of the project life cycle
SS&MA during hardware fabrication & assembly• SS&MA supports hazard report verification and closure
• Supports inspections to verify controls required by hazard reports
• SS&MA helps determine areas that require additional oversight (prioritizing safety over mission success)
• Apply an “eyes wide open” SS&MA approach; mission success builds upon rather than undermines safety requirements
• Establish the level of risk the project while not compromising safety
• Creative thinking outside the box is acceptable after safety definitions and design are understood
• Workmanship standards are not mandatory for electronic assemblies and COTs unless project (based on SS&MA recommendation) deems necessary
SS&MA during environmental testing: Environmental testing closes many V&V requirements in interface ICD, safety compliance, range safety, and Payload Safety Review Panel (PSRP) documents
• SS&MA should witness each test (including the test set-up) and requirements closing; this ensures each applicable requirement is verified without unnecessary expenditure of time or resources
• This ensures that all questions and/or RIDs/RFAs generated during technical reviews are addressed such that open items and hazard reports can be closed without having to repeat a test
Fitting SS&MA within a Sub-Class D mission’s budget & schedule• Embed/integrate SS&MA into all project elements & phases
• Cross-train key project personnel in basic SS&MA principles
• Hold everyone responsible for SS&MA
• Ensure SS&MA is a topic during all project meetings & reviews
• Use of peer reviews should be employed to compensate for the lack of independence (when a dedicated SS&MA lead is unavailable)
• Appoint one individual as the SS&MA lead
• May be independent & exclusive or a project member with other responsibilities (i.e., systems engineer, discipline lead, etc.)
• If not independent & exclusive, the project should use SMEs from the SS&MA organization as consultants and peer reviewers
• The SS&MA lead should work project-wide SS&MA issues
• Should assess & prioritize the order in & degree to which SS&MA actions are implemented based on project risk, phase, schedule, & budget
Lesson Learned (optimizing SS&MA)• Documentation must be readable and easily understandable
• Streamlining and reducing the amount of documents will save time and can aid in their readability (i.e., omit all boiler plate and unnecessary information)
• Invest the effort to develop a high fidelity concept of operations description• Shows how each subsystem of the design helps meet the mission goals
• Minimizes potential mismatches between system materials and the mission environment(s)
• Provides a mission-wide starting point for all hazard analyses
• Minimizes the possibility of designing and building to unverifiable requirements
• Research, understand, and plan to comply with the safety requirements early• The requirements are defined and the process is clear (e.g., range, PSRP)
• Leverage the expertise of the groups the project must interface with to meet safety and design requirements• PSRP, Range Safety, vehicle provider, and others can help clarify and understand
requirements
• They do this all the time and can save a project from doing unnecessary work: ask for their lesson learned and best practices
• And most importantly it establishes their buy-in and support, making the task of presenting a compliance argument to them relatively easier