14.2 Environmental Tolerance Issues
This technical area covers design data and guidance concerning user tolerance to environments.
Stress is a term used to refer to a situation or environment in which a person is taxed in some way. Strain is the negative or pathological outcome of stress.
Stressors - the environmental factors that produce a stress response in an individual (see Table 14.1).
Other sections within Section 14, The Environment of this document examine the effects of single environmental stressors or hazards. In a working situation, however, it is usual to find two or more of these stressors acting simultaneously. This section refers to the overall effect of such combinations on an operator within a system. These stressors will interact in different ways to produce one of three types of outcome. The interactions are described below:
a) Additive Effect. The combination produces a total effect, which is equal to the linear sum of the single stressors.
b) Synergistic Effect. The combination produces a total effect, which is greater than the linear sum of the single stressors.
c) Antagonistic Effect. The combination produces a total effect, which is less than the single stressor or linear sum of the single stressors.
Replaced/Superseded by document(s)
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Part 3, Section 14 provides information and technical guidance for the management and control of the physiological environment within enclosed workspaces, and the control of the user’s personal equipment for non-enclosed workspaces.
Hence, Section 14 of this document covers the following topics:
a) Environmental Tolerance Issues.
b) Environmental Stressors including: Wind, Gravity and Acceleration, Electro and Electromechanical, Radiation, Thermal, Acoustic, Vibration, Toxicity (Gases).
c) Areas of special consideration, including: the submarine and space environments.
d) Hazard Logs (Cross-reference to Def Stan 00-56).
e) Sources of Advice.
The reader is also directed to related information in Part 3 of this document as follows: Section 10, System Safety.