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are met.
The depth within the system to which each technique is used, including risk identification associated with
the system, subsystem, components, personnel, ground support equipment, GFE, facilities, and their
interrelationship in the logistic support, training, maintenance, and operational environments.
The integration of subcontractor hazard analyses with overall system hazard analyses.
Analysis is the method of identifying hazards. A sound analytical and documentation approach is required
if the end product is to be useful. An inappropriate analytical approach can be identified in the
contractor's discussion within the SSPP.
Each program is required to assess the risk of accident in the design concept as it relates to injury to
personnel, damage to equipment, or any other forms of harm. The result of this assessment is a definition
of those factors and conditions that present unacceptable accident/accident risk throughout the program.
This definition provides a program baseline for formulation of design criteria and assessment of the
adequacy of its application through systems analysis, design reviews, and operational analysis. System
FAA System Safety Handbook, Chapter 5: Post-Investment Decision Safety Activities
December 30, 2000
5 - 16
safety analyses are accomplished by various methods. As noted in Chapters 8&9 of this handbook, the
basic safety philosophy and design goals must be established prior to initiation of any program analysis
task. Without this advanced planning, the SSP becomes a random identification of hazards resulting in
operational warnings and cautions instead of design correction (i.e., temporary, not permanent solutions)
The SSPP, therefore, describes the methods to be used to perform system safety analyses. The methods
may be quantitative or qualitative, inductive or deductive, but must produce results consistent with
mission goals.
It is important that the SSP describes procedures that will initiate design change or safety trade studies
when safety analyses indicate such action is necessary. Specific criteria or safety philosophy guides trade
studies or design changes. Whenever a management decision is necessary, an assessment of the risk is
presented so that all facts can be considered for a proposed decision. It is common to find budget
considerations driving the design without proper risk assessment. Without safety representation, design
decisions may be made primarily to reduce short-term costs increasing the accident risk. Such a decision
ignores the economics of an accident. In many cases accident and accident costs far exceed the short-term
savings achieved through this process.
The contractor's system safety engineers should be involved in all trade-studies. The SSPP must identify
the responsible activity charged with generating CRAs, and with reviewing and approving the results of
trade-studies to assure that the intent of the original design criteria is met.
The hazard analysis section of the SSPP should describe in detail, the activities which will identify the
impact of changes and modifications to the accident potential of delivered and other existing systems. All
changes or modifications to existing systems must be analyzed for impact in the safety risk baseline
established by the basic system safety analysis effort. In many cases, this analysis can be very limited
where in others a substantial effort is appropriate. The results must be included for review as a part of
each engineering change proposal.
5.3.6 Safety Data
The SSPP should illustrate the basic data flow path used by the contractor. This information shows where
the system safety activity includes reviewing internally generated data and where it has approval
authority. The safety data paragraph should list system safety tasks, contract data requirements list
(CDRL) having safety significance but no specific safety reference, and the requirement for a contractor
system safety data file. The data in the file is not deliverable but is to be made available for the procuring
activity review on request.
5.3.7 Safety Verification
Safety verification must be demonstrated by implementing a dedicated safety verification test and/or
assessment program. The following information should be included in the SSPP.
· The verification (e.g., test, analysis, inspection) requirements for ensuring that safety is
adequately demonstrated. Identify any certification requirements for safety devices (e.g., fire
extinguisher, circuit breakers) or other special safety features (e.g., interlocks). Note that
FAA System Safety Handbook, Chapter 5: Post-Investment Decision Safety Activities
December 30, 2000
5 - 17
some certification requirements will be identified as the design develops so the SSPP should
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System Safety Handbook系统安全手册上(104)
