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between exposure events. Aircraft may be parked so that an explosion or fire in one aircraft will not
propagate to others. Risk may also be spread over a group of personnel by rotating the personnel involved
in a high-risk operation.
Compensate for a risk. We can create a redundant capability in certain special circumstances. Flight
control redundancy is an example of an engineering or design redundancy. Another example is to plan for
a back up, and then when a critical piece of equipment or other asset is damaged or destroyed we have
capabilities available to bring on line to continue the operation.
Risk can be reduced. The overall goal of risk management is to plan operations or design systems that do
not contain hazards and risks. However, the nature of most complex operations and systems makes it
impossible or impractical to design them completely risk-free. As hazard analyses are performed, hazards
will be identified that will require resolution. To be effective, risk management strategies must address the
components of risk: probability, severity, or exposure. A proven order of precedence for dealing with
risks and reducing the resulting risks is:
FAA System Safety Handbook, Appendix F
December 30, 2000
F-45
Plan or Design for Minimum Risk. From the first, plan the operation or design the system to eliminate risks.
Without hazards there is no probability, severity or exposure. If an identified risk cannot be eliminated,
reduce the associated risk to an acceptable level. Flight control components can be designed so they
cannot be incorrectly connected during maintenance operations as an example.
Incorporate Safety Devices. If identified hazards cannot be eliminated or their associated risk adequately
reduced by modifying the operation or system elements or their inputs, that risk should be reduced to an
acceptable level through the use of safety design features or devices. Safety devices can effect probability
and reduce severity: an automobile seat belt doesn’t prevent a collision but reduces the severity of
injuries.
Provide Warning Devices. When planning, system design, and safety devices cannot effectively eliminate
identified hazards or adequately reduces associated risk, warning devices should be used to detect the
condition and alert personnel of the hazard. As an example, aircraft could be retrofitted with a low
altitude ground collision warning system to reduce controlled flight into the ground risks. Warning
signals and their application should be designed to minimize the probability of the incorrect personnel
reaction to the signals and should be standardized. Flashing red lights or sirens are a common warning
device that most people understand.
Develop Procedures and Training. Where it is impractical to eliminate hazards through design selection or
adequately reduce the associated risk with safety and warning devices, procedures and training should be
used. A warning system by itself may not be effective without training or procedures required to respond
to the hazardous condition. The greater the human contribution to the functioning of the system or
involvement in the operational process, the greater the chance for variability. However, if the system is
well designed and the operation well planned, the only remaining risk reduction strategies may be
procedures and training. Emergency procedure training and disaster preparedness exercises improve
human response to hazardous situations.
In most cases it will not be possible to eliminate safety risk entirely, but it will be possible to significantly
reduce it. There are many risk reduction options available. Examples are included in the next section.
3.1.1 THE RISK CONTROL OPTIONS MATRIX
The sample risk control options matrix, illustrated at Figure 3.1.1A, is designed to develop a detailed and
comprehensive list of risk control options. These options are listed in priority order of preference, all
things being equal, therefore start at the top and consider each option in turn. Add those controls that
appear suitable and practical to a list of potential options. Examples of control options for each are
suggested in Figure 3.1.1B. Many of the options may be applied at more than one level. For example, the
training option may be applied to operators, supervisors, more senior leaders, or staff personnel.
Figure 3.1.1A Sample Risk Control Options Matrix
OPTONS OPERATOR LEADER STAFF MGR
ENGINEER (Energy Mgt)
Limit Energy
Substitute Safer Form
Prevent Buildup
Prevent Release
Provide Slow Release
FAA System Safety Handbook, Appendix F
December 30, 2000
F-46
OPTONS OPERATOR LEADER STAFF MGR
Rechannel/separate In
Time/Space
Provide Special Maint of
　
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