Function-Failure & Failure Modes

Now that you have created your components and associated activities, you can now allocate the function, failure and failure modes for each component.

Let's review the process in more detail.

1. Choose the appropriate item in your hierarchy, select the Tactics module and then the specific Component. Afterwards, click on View Strategies. You can now see the structure of the selected item. 
    

   

2. Select the component and you will be presented with an input card allowing you to enter the required information. When you are finished, click Save and the function-failure will become available to use.
   
    

   

3. Select the Add Failure Mode button, and you will be presented with an input card allowing you to enter the required information.
   
    

   

4. Clicking on Criticality Analysis will allow you to assign a criticality to the failure mode. For more information on criticality please refer to the article on Criticality Analysis.
   
    

   

5. Clicking on Add Activity will provide you with a variety of options:
   1. Corrective Instructions: Add an activity that will remedy the failure mode
   2. Predictive Instructions: Add an activity that detects the failure mode.
   3. Preventative Instructions: Add a routine maintenance activity to prevent the failure.
   4. Other Instructions: Add any other task.
   5. Preparation Activities: Add preparation activities and link them to other activities. These can also be allocated as an Opex Cost, Capital Cost or Not Budgeted.
   6. Follow Up Activities: Add follow up activities and link them to other activities. These can also be allocated as an Opex Cost, Capital Cost or Not Budgeted.
   Beta, Eta and Gamma attributes are associated with reporting of Weibull parameters. 
    
   Eta

   The Value of eta is the characteristic life (eta+gamma is the time at which 63.2% are expected to fail) of the maintainable item based on the occurrence of the associated failure mode.

   Beta

   The Value of beta represents the shape (characteristic of failure profile) of the maintainable item based on the occurrence of the associated failure mode. Entering a value for beta will override what has been set as a default that is associated to this mechanism and cause.

   Gamma

   The Value of Gamma represents the failure free time for the maintainable item based on the occurrence of the associated failure mode. This is the duration that a given failure mode will not be observed within (e.g. while a failure mode of corrosion can occur on an item upon immediate installation, a stress fracture can be guaranteed to not occur within the first day of productive operation).
    
6. Save the card when you've added all necessary information. The figure below shows a completed function-failure and failure mode for an alternator, where;
   1. Function = Charges battery
   2. Failure = Does not charge battery
   3. Failure mode = Bearing wears due to abrasion