AAOM Handbook

Threat Rating

A calculated value used to compare the current level of Threat compared to the maximum (the Criticality Rating) Note that for Threats that have a early failure or wear out pattern the Threat Rating varies with time (decreasing and increasing respectively).

Trigger Interval

The value of the Trigger Parameter at which a Service work activity should be initiated, eg 30 days, 250 hrs, 50,000 tonnes, prior event etc.

Trigger Parameter

The characteristic that is used to determine that a Service work activity should be initiated, eg calendar time, operating time, throughput, a precedent event etc.

Warning Interval

The period between the earliest ability to detect a developing Threat and the occurrence of that Threat. Due to the inevitable variation in Warning Interval between Threat events, the Warning Interval is defined by a probability distribution. The OPERATING MODEL uses the minimum, most likely and maximum Warning Interval to define this distribution. It is also common to specify a Warning Interval at a nominated confidence level, eg the Warning interval will be greater than 1 month at a 90% confidence. Work Packages are created for efficient execution of the actions defined from selected Service strategies. In some cases a single work package combines actions from several Service strategies. A Work Package comprises all of the elements necessary for the work, which may include a Work Order, Tasks, Bills of Materials, Work Instructions, Drawings etc. Each Service Work Package will have distinct scheduling parameters such as a Trigger Parameter and Trigger Interval. Work Package

Work Scheduling System (WSS)

A system that is used to monitor the trigger conditions for Production and Service Work Packages, and to create the appropriate Work Packages, from Standard Jobs, when the trigger conditions have been met.

© McAlear Management Consultants 2004

Page 13 of 27