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to determine the potential relationship between system-level hazards, hardware elements and software
control and monitoring and safety functions, and to develop design requirements, guidelines, and
recommendations to eliminate or reduce the risk of those hazards to an acceptable level. Enough
information can be collected to designate hardware and software functions as safety critical.
During the Demonstration and Evaluation and/or Full-Scale Development phases, the developer should
analyze the system along with hardware/software design and requirements documents to:
· Refine the identification of hazards associated with the control of the system
· Safety-critical data generated or controlled by the system
· Safety-critical non-control functions performed by the system and unsafe operating modes for
resolution.
The requirements hazard analysis is substantially complete by the time the allocated baseline is defined.
The requirements are developed to address hazards, both specific and nonspecific, in hardware and
software.
The requirements hazard analysis may use the PHL and the PHA as a basis, if available. The analysis
relates the hazards identified to the system design and identifies or develops design requirements to
eliminate or reduce the risk of the identified hazards to an acceptable level. The requirements hazard
analysis is also used to incorporate design requirements that are safety related but not tied to a specific
hazard. This analysis includes the following:
Determination of applicable generic system safety design requirements and guidelines for both hardware
and software from applicable military specifications, Government standards, and other documents for the
FAA System Safety Handbook, Chapter 8: Safety Analysis/Hazard Analysis Tasks
December 30, 2000
8- 14
system under development. Incorporate these requirements and guidelines into the high-level system
specifications and design documents, as appropriate.
Analysis of the system design requirements, system/segment specifications, preliminary hardware
configuration item development specifications, software requirements specifications, and the interface
requirements specifications, as appropriate, including the following sub-activities:
· Develop, refine, and specify system safety design requirements and guidelines;
translate into system, hardware, and software requirements and guidelines, where
appropriate; implement in the design and development of the system hardware and
associated software.
· Identify hazards and relate them to the specifications or documents above and
develop design requirements to reduce the risk of those hazards.
· Analyze the preliminary system design to identify potential hardware/software
interfaces at a gross level that may cause or contribute to potential hazards.
Interfaces to be identified include control functions, monitoring functions, safety
systems, and functions that may have indirect impact on safety.
· Perform a preliminary risk assessment on the identified safety-critical software
functions using the hazard risk matrix or software hazard risk matrix of Chapter 10 or
another process as mutually agreed to by the contractor and the MA.
· Ensure that system safety design requirements are properly incorporated into the
operator, users, and diagnostic manuals.
· Develop safety-related design change recommendations and testing requirements and
incorporate them into preliminary design documents and the hardware, software, and system
test plans. The following subactivities should be accomplished:
· Develop safety-related change recommendations to the design and specification
documents listed above and include a means of verification for each design
requirement.
· Develop testing requirements. The contractor may develop safety-related test
requirements for incorporation into the hardware, software, and system integration
test documents.
· Support the system requirements review, system design review, and software specification
review from a system safety viewpoint. Address the system safety program, analyses
performed and to be performed, significant hazards identified, hazard resolutions or proposed
resolutions, and means of verification.
For work performed under contract details to be specified in the SOW shall include, as applicable:
· Definition of acceptable level of risk within the context of the system, subsystem, or
component under analysis
· Level of contractor support required for design reviews
· Specification of the type of risk assessment process.
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System Safety Handbook系统安全手册下(30)
