AAOM Handbook

actions will 'undo' the corrosion or wear that has already occurred, but each will slow the rate at which further corrosion or wear occurs. • Reconditioning – actions taken to reduce a likelihood of an unwanted event occurring by restoring the degraded condition of only a component, or limited area, of a Serviceable item. This is typically economical where there are a number of independent risks, each with a different rate of development, and which can be economically controlled individually. For example; retraining employees on critical activities, replacing bolts in a steel structure (bolts typically have a higher rate of corrosion than the primary steelwork), replacing worn valves and valve seats in an engine (that may typically degrade at a much faster rate than the bulk of the cylinder head or engine). • Replacement – actions taken to reduce a risk by replacing the whole, or a substantial part of a Serviceable Item. This is typically economical where there are a number of probable risks that develop at the same time (which is often the 'designed life' of an item) and where it is more economical to replace the whole item than it is to restore or replace individual elements. For example, truck engines are replaced at an economic tipping point in their life, as is the whole truck. • The technical feasibility of each of the strategy options. • Whether the unwanted event has a detectable onset. • The warning time for detectable onset unwanted events. • Whether the unwanted event has an 'age' related characteristic with a sharply rising probability. • The consistency of the interval to rising probability for 'age' related unwanted event. • The consequence of the risk (the HSE risk characteristics, the direct repair cost and the lost opportunity cost of production). • The level of exposure to potential consequences when a risk is realised (unwanted event occurs), i.e. to what extent the potential consequences are probable. • The cost to implement the strategy option. As explained above, some strategies will require both a primary and secondary service action for their implementation. Specifying the potential Service Strategies for a process includes specifying the primary and secondary actions associated with that strategy. The Service strategies that are appropriate for a particular risk will depend upon a few basic factors;

Purpose

To specify the Service Strategy options that are technically feasible for each significant risk.

Quantity

• One list of potential (technically feasible) Service Strategies for each identified significant risk.