Mil-Std-882E System Hazard Analysis (Task 205)

This is Mil-Std-882E System Hazard Analysis (SHA).
Back to: Task 204.

The 200-series tasks fall into several natural groups. Task 205 addresses System Hazard Analysis.

In the 45-minute video, The Safety Artisan looks at System Hazard Analysis, or SHA, which is Task 205 in Mil-Std-882E. We explore Task 205’s aim, description, scope and contracting requirements. We also provide value-adding commentary, which explains SHA – how to use it to complement Sub-System Hazard Analysis (SSHA, Task 204) in order to get the maximum benefits for your System Safety Program.

The text from the standard follows:

“SYSTEM HAZARD ANALYSIS

205.1 Purpose. Task 205 is to perform and document a System Hazard Analysis (SHA) to verify system compliance with requirements to eliminate hazards or reduce the associated risks; to identify previously unidentified hazards associated with the subsystem interfaces and faults; identify hazards associated with the integrated system design, including software and subsystem interfaces; and to recommend actions necessary to eliminate identified hazards or mitigate their associated risks.

[Task Description]

205.2 Task description. The contractor shall perform and document an SHA to identify hazards and mitigation measures in the integrated system design, including software and subsystem and human interfaces. This analysis shall include interfaces associated with Commercial-Off-theShelf (COTS), Government-Off-the-Shelf (GOTS), Government-Furnished Equipment (GFE), Non-Developmental Items (NDI), and software. Areas to consider include performance, performance degradation, functional failures, timing errors, design errors or defects, and inadvertent functioning. While conducting this analysis, the human shall be considered a component within the system, receiving both inputs and initiating outputs.

205.2.1 This analysis shall include a review of subsystems interrelationships for:

a. Verification of system compliance with requirements to eliminate hazards or reduce the associated risks.

b. Identification of previously unidentified hazards associated with design of the system. Recommend actions necessary to eliminate these hazards or mitigate their associated risk.

c. Possible independent, dependent, and simultaneous events, including system failures, failures of safety devices, common cause failures, and system interactions that could create a hazard or result in an increase in risk.

d. Degradation of a subsystem or the total system.

e. Design changes that affect subsystems.

f. Effects of human errors.

g. Determination:

(1) Of potential contribution of hardware and software events (including those that are developed by other contractors/sources, COTS, GOTS, NDIs, and GFE hardware or software), faults, and occurrences (such as improper timing) on the potential for mishaps.

(2) Of whether design requirements in the system specifications have been satisfied.

(3) Of whether the methods of implementing the system design requirements and mitigation measures have introduced any new hazards.

205.2.2 If no specific analysis techniques are directed or if the contractor recommends a different technique than the one specified by the Program Manager (PM), the contractor shall obtain PM approval of techniques to be used before performing the analysis.

205.2.3 When software to be used within the system is being developed under a separate software development effort, the contractor performing the SHA shall monitor, obtain, and use the output of each phase of the formal software development process in evaluating the software contribution to the SHA. Hazards identified that require mitigation action by the software developer shall be reported to the PM in order to request appropriate direction be provided to the software developers.

205.2.4 The contractor shall evaluate system design changes, including software design changes, and update the SHA as necessary.

205.2.5. The contractor shall prepare a report that contains the results from the task described in paragraph 205.2 and includes:

a. System description. The system description provides the physical and functional characteristics of the system and its subsystem interfaces. Reference to more detailed system and subsystem descriptions, including specifications and detailed review documentation, shall be supplied when such documentation is available.

b. Hazard analysis methods and techniques. Provide a description of each method and technique used in conduct of the analysis. Include a description of assumptions made for each analysis and the qualitative or quantitative data used.

c. Hazard analysis results. Contents and formats may vary according to the individual requirements of the program and methods and techniques used. As applicable, analysis results should be captured in the Hazard Tracking System (HTS).

[Contracting]

205.3 Details to be specified. The Request for Proposal (RFP) and Statement of Work (SOW) shall include the following, as applicable:

a. Imposition of Task 205. (R)

b. Identification of functional discipline(s) to be addressed by this task. (R)

c. Desired analysis methodologies and technique(s) and any special data elements, format, or data reporting requirements (consider Task 106, Hazard Tracking System). d. Selected hazards, hazardous areas, or other specific items to be examined or excluded.

e. COTS, GOTS, NDI, and GFE technical data to enable the contractor to accomplish the defined task.

f. Concept of operations.

g. Other specific hazard management requirements, e.g., specific risk definitions and matrix to be used on this program.

Forward to the next excerpt: Task 206

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Author: Simon Di Nucci

Hi everyone, I'm Simon and I have been a system safety engineer for over twenty years. For my full bio, please see my LinkedIn page.

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