HCRQ, INC. SYSTEM & SOFTWARE SAFETY EXPERTS
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  • Home
  • Markets
    • Aviation
    • Defense
    • Unmanned Systems
    • Rail Transportation
    • Process
    • Automotive
    • Nuclear
    • Medical
  • System/Software Safety Services
    • Consulting >
      • System Safety
      • Software Safety
      • Reliability, Availability, Maintainability
      • Quality Assurance / Quality Control
      • Full List of Consulting Services
    • Training >
      • Courses >
        • System Safety Course
        • Software Safety Course
        • MIL-STD-882E System Safety Course
        • Aviation System Safety Course
        • Hands-On Fault Tree Analysis Course
      • Webinars >
        • System Safety Webinars >
          • System & Software Safety: If You Were Us, What Would You Watch Out For?
          • System Safety Management Plans (SSMPs)
          • System Safety Program Plans (SSPPs)
          • Preliminary Hazard Analysis & Hazard Tracking
          • Operating & Support Hazard Analysis
          • Safety Assessment Report
          • Estimating Probabilities of Human Failures
        • Software Safety Webinars >
          • Software Safety Program Plans (SwSPPs)
          • Software FTA & Software FMEA
        • Other Webinars >
          • How To Get Promoted
        • Webinar FAQs
      • Renowned Attendees
      • Previous Course Attendees
    • Products >
      • Fault Tree Analyses - When to Accept, When to Reject
      • System Safety Program Plan (SSPP) Example
  • Scheduled Courses & Webinars
    • Scheduled Courses
    • Scheduled Webinars
  • Proposal & Technical Writing
    • Proposal Writing
    • Technical Writing
  • About Us
    • Who We Are
    • Hunter Austegard
    • China Austegard
    • Applicable Codes
    • Client List
    • Testimonials - Courseware
    • Testimonials - Consulting
    • Referral Fees
    • Newsletters
    • Reference Material
    • Careers
    • Contact Us
HCRQ, INC. SYSTEM & SOFTWARE SAFETY EXPERTS

PRELIMINARY SYSTEM SAFETY ASSESSMENT (PSSA)


The Preliminary System Safety Assessment is a safety assessment technique defined in SAE ARP4761.

An iterative process, the PSSA assures that requirements identified in the Functional Hazard Assessment (FHA) are met.

The PSSA is used to complete the failure conditions list and the corresponding safety requirements.  It is also used to demonstrate how the system will meet the qualitative (system Development Assurance Levels (DALs); item DALs, hardware DALs and software levels) and quantitative (safety-related reliability targets) safety requirements for the various hazards identified.

It identifies and captures all derived system safety requirements.  The PSSA process identifies protective strategies, taking into account fail-safe concepts and architectural attributes which may be needed to meet the safety objectives.  Pull down its zipper and look inside - what do you see??

PSSA outputs are used as inputs to the System Safety Assessment (SSA) and other documents, including, but not limited to, system requirements, hardware requirements and software requirements.


Want to learn more?  SAE ARP4761 and much, much more? 
Take our 3-day Aviation System Safety Course or our 4-day System Safety Course.  
Find out what the attraction is. 
What are the strengths and weaknesses of 4761?  Have we got your curiosity up?


Contact us if you would like to purchase a PSSA Data Item Description (DID).  You won't find a DID of this caliber elsewhere.  Years ago we were paid to improve the DIDs that are publicly available.  The one for PSSA is just one of them.

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