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Activity 3 - Requirements Hazard Analysis (RHA)
Activity 4- Subsystem Hazard Analysis (SSHA)
Activity 5 - System Hazard Analysis (SHA)
Activity 6 - Operating and Support Hazard Analysis (O&SHA)
Activity 7 - Health Hazard Assessment (HHA)
The completion of these activities represents the bulk of the SSP. The output and the effects of
implementing the activities are the safety program. Review of the documented analyses provides the MA
and integrator visibility into the effectiveness and quality of the safety program. It is recommended that
these analyses be documented in a format compatible with an efficient review.
The following format features are recommended:
·  Inclusion of a "road map" to show the sequence of tasks performed during the analysis.
·  Presentation style, which may be in contractor format, consistent with the logic of the
analysis procedure.
·  All primary (critical) hazards and risks listed in an unambiguous manner.
·  All recommended hazard controls and corrective actions detailed.
Questions that the reviewer should ask as the analyses are reviewed include the following:
·  Do the contributory hazards listed include those that have been identified in accidents of
similar systems?
·  Are the recommended hazard controls and corrective actions realistic and sufficient?
·  Are the recommended actions fed back into the line management system in a positive way
that can be tracked?
Figure 8-2 illustrates the interrelationship of these tasks and their relationship to the design and
contractual process.
FAA System Safety Handbook, Chapter 8: Safety Analysis/Hazard Analysis Tasks
December 30, 2000
8- 11
Figure 8-2: Hazard Analysis Relationships
8.4.1 Activity 1: Preliminary Hazard List
The Preliminary Hazard List (PHL) is generated at the start of each hazard analysis. It is basically a list
of anything that the analyst can think of that can go wrong based on the concept, its operation and
implementation. It provides the MA with an inherent list of hazards associated with the concept under
consideration. The contractor may be required to investigate further selected hazards or hazardous
characteristics identified by the PHL as directed by the MA to determine their significance. This
information is important for the MA in making a series of decisions ranging from "Should the program
continue?" to shaping the post contractual safety requirements. The PHL may be generated by either the
MA or a contractor.
The PHL lists of hazards that may require special safety design emphasis or hazardous areas where indepth
analyses need to be done. Example uses of the PHL include providing inputs to the determination
process of the scope of follow-on hazard analyses (e.g., PHA, SSHA). The PHL may be documented
using a table-type format.
8.4.2 Activity 2: Preliminary Hazard Analysis
The Preliminary Hazard Analysis (PHA) is the initial effort in hazard analysis during the system design
phase or the programming and requirements development phase for facilities acquisition. It may also be
used on an operational system for the initial examination of the state of safety. The purpose of the PHA is
not to affect control of all risks but to fully recognize the hazardous states with all of the accompanying
system implications.
The PHA effort should begin during the earliest phase that is practical and updated in each sequential
phase. Typically, it is first performed during the conceptual phase but, when applicable, may be
performed on an operational system. Performing a PHA early in the life cycle of a system provides
important inputs to tradeoff studies in the early phases of system development. In the case of an
operational system, it aids in an early determination of the state of safety. The output of the PHA may be
used in developing system safety requirements and in preparing performance and design specifications.
In addition, the PHA is the basic hazard analysis that establishes the framework for other hazard analyses
that may be performed.
PHL
CONTRACTUAL
REQUIREMENTS
SYSTEM
SAFETY
PROGRAM
PLAN
O&SHA
TEST &
EVALUATION
Pre-Contract Contract
PHA RHA PHA SHA SSHA HHA O&SHA
Concept
Exploration
Preliminary
Design
Design Corrective
Action
REQMTS
SSHA
PHA
FAULT TREE
ANALYSES
FAA System Safety Handbook, Chapter 8: Safety Analysis/Hazard Analysis Tasks
December 30, 2000
8- 12
A PHA must include, but not be limited to, the following information:
·  As complete a description as possible of the system or systems being analyzed, how it will be
　
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