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Mil-Std-1629A Related FMEA Definitions

Compensating Provision:  Actions available or that can be taken to negate or
reduce the effect of a failure on a system.

Criticality:  a measure of the frequency of occurrence of an effect.
May be based on qualitative judgement or may be based on failure rate data.

Detection Method:  The method by which a failure can be discovered by the
system operator under normal system operation or by a maintenance crew
carrying out a specific diagnostic action.

End Effect:  The consequence a failure mode has upon the operation, function
or status at the highest indenture level.

Failure Cause:  The physical or chemical processes, design defects, quality
defects, part misapplication or other processes which are the basic reason for
failure or which can initiate the physical process by which deterioration proceeds
to failure.
(Past)

Failure Effect:  The consequence of a failure mode upon the operation,
function or status of a system or equipment.
(Future)

Failure Mode:  The way in which a failure is observed, describes the way the
failure occurs, and its impact on equipment operation.
(Present)

Indenture Levels:  The levels which identify or describe the relative complexity
of an assembly or function.

Local Effect:  The consequence a failure mode has on the operation, function
or status of the specific item being analyzed.

Mission Phase Operational Mode:  The statement of the mission phase and
mode of operation of the system or equipment in which the failure occurs.

Next Higher Level Effect:  The consequence a failure mode has on the
operation, functions, or status of the items in the next higher indenture level
above the specific item being analyzed.

Severity:  Considers the worst possible consequence of a failure classified by
the degree of injury, property damage, system damage and mission loss that
could occur (
Mil-Std-1629A FMECA severities).

Single Point Failure:  The failure of an item which can result in the failure of
the system and is not compensated for by redundancy or an alternative
operational procedure.

FMEA Definitions

Other Related FMEA Definitions

Risk Priority Number (RPN) - Provides an alternate evaluation approach to
Criticality Analysis. The risk priority number provides a qualitative numerical
estimate of design risk.  RPN is defined as the product of three independently
assessed factors:  Severity(S), Occurrence (O) and Detection (D).
RPN = (S) * (O) * (D)

Severity (S)
-  Severity is a numerical subjective estimate of how severe the
customer (next user) or end user will perceive the EFFECT of a failure.
Examples of Severities.

Occurrence (O) - Occurrence or sometimes termed LIKELIHOOD, is a
numerical subjective estimate of the LIKELIHOOD that the cause, if it occurs, will
produce the failure mode and its particular effect.
Examples of Occurrence
values.

Detection (D) - Detection is sometimes termed EFFECTIVENESS. It is a
numerical subjective estimate of the effectiveness of the controls to prevent or
detect the cause or failure mode before the failure reaches the customer. The
assumption is that the cause has occurred.
Examples of Detection values.
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