Measurement-specific scheduling intervals

Measurement-specific scheduling rules let you define multiple different scheduling intervals, and then specify which scheduling interval to use based on a measurement recorded during task execution. In other words, when this requirement is performed the technician will take a measurement and the value of that measurement will determine how long until the next iteration of this requirement is due.

You can setup a measurement-specific scheduling rule where the interval is 0. This means that if the measurement falls within a particular range, the next iteration of the requirement will become immediately overdue. You would do this to indicate that a particular measurement value is unacceptable. Whatever problem caused this extreme measurement value will need to be fixed and a new measurement taken, in order to stop the interval from being 0.

You must also indicate the extreme measurement value at which this requirement is no longer required. For example, if the tire pressure is over 100 PSI, cancel this particular requirement. This is used to indicate a measurement so good that the requirement is no longer needed. If this requirement should never be canceled, then specify a measurement range so extreme that maintenance execution will never record this value.

Measurement-specific scheduling intervals only apply to recurring requirement definitions. They do not apply to one-time requirements, nor do they apply to blocks of any kind.

For example, here is an on-condition requirement (a crack inspection) that would be initiated when a small crack is found. Every time this requirement is performed, the maintenance technician will be asked to measure the crack length.

• If the crack length is greater than 10cm, the next occurrence is due in 0 hours (ie. The next requirement will become immediately overdue).
• If the crack length is greater than 5cm but smaller than 10cm, the next occurrence is due in 100 hours.
• If the crack length is greater than 0cm but smaller than 5cm, the next occurrence is due in 500 hours.
• If the crack length is 0cm (no crack), then cancel this requirement.

  In this example, the scheduling interval becomes smaller as the measurement increases. You can also use decreasing measurement values to change the scheduling interval, for example, you could specify that the scheduling interval becomes shorter as the tire thread depth measurement decreases.

When you create a measurement specific rule, you select the following information:

• The scheduling interval parameter to use on this requirement.
• The measurement parameter which will be collected during execution.
• Whether you want to create increasing scheduling intervals as the measurement value increases, or increasing scheduling intervals as the measurement value decreases. For example, when measuring the length of a crack, you would set different scheduling intervals as the measurement value increase, whereas when measuring tire tread depth, you would set different scheduling intervals as the measurement value decreases.
• The measurement value at which the requirement will be canceled.