ITEM TOOLKIT

Chapter 8 Fault Tree 183
Field
Title
Name
Part Number
LCN
Circuit Ref
Analyst
Compiled by
Approved by
Cut-Off
Sort Cut Sets
Miscellaneous
Description
Function
Description
Notes
Failure Rate
Failure Frequency
No. of Expected
Failures
Conditional Failure
Intensity
Total Down Time
Unreliability
Unavailability
Quantification
Method
BDD
Modularize
CCF
Uncertainty
Description
System Title.
Unique Reference Identifier for the System.
System Part Number.
Logistic Control Number.
Circuit Reference Number.
Name of the person performing the Fault Tree Analysis.
Name of the person who gathered the data for the Fault Tree Analysis.
Name of the person who was required to sign off on the Fault Tree project.
Cut-Off by Probability or by Order can be selected. If you select the Probability box, enter the
Unavailability and the Frequency cut-off rate for this project. Click the Order box if you wish to
have an Order Cut-Off. If you select this box, you must then enter the Cut-Off value total for this
project.
Select whether you wish to Sort Cut Sets by Unavailability, by Frequency, or by Order and enter
the maximum amount of sort sets. Click “Off” if you do not wish to use Sort Cut Sets. (Cut Sets
are a group of events that, when occurring together, will cause system failure.)
Click the box to Use Maximum Risk Dormant Model for this analysis, then enter the project
lifetime given in hours and the total number of immediate time points for the Dormant Model.
Description for this System.
Purpose/Description of this system.
Any other pertinent information about this system.
This is the probability of failure per unit time, given that the component was working as designed
at time zero, and has survived to time t.
Displays the project failure frequency once analysis is complete. The unconditional failure
intensity is the probability that the system fails per unit time, given that it was working as
designed at time 0.
Display the number of times the system is expected to fail over the specified lifetime (in hours)
of this project once the analysis is complete.
This is the probability of failure per unit time, given that the component was working as designed
at time zero and is working at time t.
Displays the total down time for this project if and when a failure occurs during the specified
system lifetime (in hours) once the analysis is complete.
This is the probability that one or more failures will occur over a specified period of time.
This is the probability that the component or system is unavailable at any given time.
Click on the selected Quantification method.
Click this box to enable the Binary Decision Diagram analysis facilities.
Click this box to modularize independent sub-blocks.
Click this box if you wish to perform a Common Cause Failure Analysis.
Click this box if you wish to perform an Uncertainty Analysis. If you select this box, you must
then enter the Sample Size and the Percentile.