Function | HARA and FHA | The studied functions correspond to the functions implemented by the analyzed system. The purpose is to determine hazardous events for each aspect of the functions to prevent risks. |
Failure Mode | HARA and FHA | A failure mode corresponds to a cause, which leads to a hazardous situation. |
Hazardous Event | HARA and FHA |
A hazardous event is a failure condition, which occurs under specific operational conditions. A hazardous event is a relevant combination of a vehicle-level hazard and an operational
situation of the vehicle with potential to lead to an accident, if a timely driver
action does not control it.
A functional failure scenario may lead to more than one failure condition.
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Exposure | HARA | An exposure is a state of being in a scenario that can occur during a vehicle's life and that can be hazardous if coincident with the failure mode under analysis. |
Controllability | HARA | A controllability is the ability to avoid a specified harm or damage through the timely reactions of the involved individuals. |
Severity | HARA | A severity is an estimate of the extent of harm to one or more individuals that can occur in a potentially hazardous situation. |
Safety Goal | HARA | A safety goal is a top-level safety requirement that is assigned to a system. The purpose is to
reduce the risk of one or more hazardous events to a tolerable level. A safety goal is a top-level safety requirement as a result of the hazard analysis and risk assessment. A safety goal is determined for each hazardous event.
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ASIL | HARA | An
Automotive Safety Integrity Level
(ASIL) represents an automotive-specific
risk-based classification of a
safety goal
as well as the validation and confirmation
measures required by the standard to ensure accomplishment of that
goal. An ASIL is assigned to each hazardous event. For more information, see ASIL Determination. |
Failure Condition | FHA | A failure condition is a condition with an effect on the aircraft and its occupants. It is caused or contributed to by failures, considering relevant adverse operation or environmental conditions. It is classified in compliance with the severity of its effects. |
Failure Effects | FHA | A failure effect is a description of the operation of a system as the result of a failure. That is the consequences that a failure mode has on the operation, function, or status of a system. |
Requirement | FHA | A requirement is an identifiable element of a specification that can be validated and against which an implementation can be verified. Requirements are defined to counter the adverse effects or causes. |
Supporting Material | FHA | The supporting material is the material required to justify the effect classification of failure
conditions such as studies, tests, ... |