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described in (4), and not the probability of just the hazard occurring.
Document the assumptions and justification for how severity and likelihood for each hazard condition
was determined.
FAA System Safety Handbook, Chapter 5: Post-Investment Decision Safety Activities
December 30, 2000
5 - 1
Chapter 5: Post-Investment Decision Safety Activities
5.0 POST-INVESTMENT DECISION SAFETY ACTIVITIES ....................................................2
5.1 OBJECTIVES AND REQUIREMENTS...................................................................................2
5.2 PREPARING A SYSTEM SAFETY PROGRAM PLAN.........................................................5
5.3 SYSTEM SAFETY PROGRAM PLAN CONTENTS ..............................................................8
5.4 INTEGRATED SYSTEM SAFETY PROGRAM PLAN .......................................................18
5.5 PROGRAM BALANCE...........................................................................................................23
5.6 PROGRAM INTERFACES.....................................................................................................23
5.7 TAILORING...........................................................................................................................26
FAA System Safety Handbook, Chapter 5: Post-Investment Decision Safety Activities
December 30, 2000
5 - 2
5.0 Post-Investment Decision Safety Activities
After a program baseline is approved, it transitions to the IPT for Solution Implementation. In this phase,
the IPT prepares the necessary documentation to acquire the system. At this point, the IPT has been
involved during the IA process, and has prepared the Acquisition Program Baseline, Acquisition Strategy
Paper and Integrated Program Plan for approval by the JRC. It is now the team’s responsibility to work
with the procurement organization to prepare the Request for Proposal and Statement of Work. This
chapter defines how to establish a System Safety Program for the acquisition. Chapter 6 defines
guidelines for how to manage the contracting activity for a contractor’s System Safety Program Plan. It is
appropriate to point out that an initial System Safety Program Plan (SSPP) is prepared prior to the
Investment Decision and well as one following JRC2, as described in this chapter.
5.1 Objectives and Requirements
The principal objective of an SSP within the FAA is to ensure that safety is consistent with mission
requirements and is designed into systems, subsystems, equipment, facilities, and their interfaces and
operation. The degree of safety achieved in a system depends directly on management emphasis and
commitment. The FAA and its contractors must apply management emphasis to safety during the system
acquisition process and throughout the life cycle of each system, ensuring that accident risk is identified
and understood, and that risk reduction is always considered in the management review process.
A formal safety program that stresses early hazard identification and elimination or reduction of
associated risk to a level acceptable to the managing activity (MA) is not only effective from a safety
point of view but is also cost effective.
The FAA SSP is structured on common-sense procedures that have been effective on many programs.
These procedures are commonly known as the Safety Order of Precedence as summarized in Table 5-1.
These four general procedures are used to establish the following SSP activities:
·  Eliminate identified hazards or reduce associated risk through design, including material
selection or substitution.
·  Design to minimize risk created by human error in the operation and support of the system.
·  Protect power sources, controls, and critical components of redundant subsystems by
separation, isolation, or shielding.
·  When design approaches cannot eliminate a hazard, provide warning and caution notes in
assembly, operations, maintenance, and repair instructions, and distinctive markings on
hazardous components and materials, equipment, and facilities to ensure personnel and
equipment protection. These will be standardized in accordance with MA requirements.
FAA System Safety Handbook, Chapter 5: Post-Investment Decision Safety Activities
December 30, 2000
5 - 3
Table 5-1: Safety Order of Precedence
Description Priority Definition
Design for minimum risk. 1 From the first design to eliminate risks. If the
identified risk cannot be eliminated, reduce it to an
acceptable level through design selection.
Incorporate safety devices. 2 If identified risks cannot be eliminated through
design selection, reduce the risk via the use of
fixed, automatic, or other safety design features or
　
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