Benefits of Fault Trees Analysis

• The fault tree explicitly shows all the different relationships that are necessary to result in the top event.
• In constructing the fault tree, a thorough understanding is obtained of the logic and basic causes leading to the top event.
• The fault tree is a tangible record of the systematic analysis of the logic and basic causes leading to the top event.
• The fault tree provides a framework for thorough qualitative and quantitative evaluation of the top event.

Fault Tree Editor
You can easily create complex Fault Trees with the TopEvent FTA Fault Tree Editor. The Fault Tree Editor includes two Views: the standard Fault Tree Diagram View and the Tree List View. These Views provide a full overview of the Fault Tree. TopEvent FTA allows you to create both coherent and non-coherent fault trees.

The gates and events supported by TopEvent FTA are:

• AND
• OR
• Voting
• Inhibit
• Exclusive OR
• NOT
• NOR
• NAND
• Transfer
• Basic Event
• House Event
• Undeveloped Event
• Conditioning Event

Qualitative Fault Tree Analysis
With TopEvent FTA, you can quickly evaluate complex Fault Trees with millions of Minimal Cut Sets. The Qualitative Fault Tree Evaluation can be obtained via the Classical Minimal Cut Sets Method (Classical MCSs Method) or the Binary Decision Diagram Method (BDD Method). TopEvent FTA supports cut-off thresholds based on the maximum order of the Minimal Cut Sets (Order cut-off) and the minimum probability of the Minimal Cut Sets (Probability cut-off). 

Quantitative Fault Tree Analysis
TopEvent FTA can calculate the exact values of the Unavailability and Importance Factors. The Quantitative Fault Tree Evaluation can be obtained via the Classical Minimal Cut Sets Method or the Binary Decision Diagram Method. The BDD Method provides the exact values of the Unavailability and Importance Factors, and the Classical Method provides a rare event approximation of the probabilities.

TopEvent FTA provides methods for calculating:

• Minimal Cut Sets
• Unavailability
• Availability
• Reliability
• Unreliability
• Unconditional Failure Intensity
• Conditional Failure Intensity
• Expected Number of Failures
• Total Down Time
• Average Unavailability
• Average Unconditional Failure Intensity
• Average Conditional Failure Intensity
• Probability of Failure on Demand (PFD)
• Average Probability of Failure on Demand (PFD Avg)
• Probability of Failure per Hour (PFH)
• Average Probability of Failure per Hour (PFH Avg)
• Marginal Importance Factor (Birnbaum Importance)
• Critical Importance Factor (Fussell-Vesely Importance)
• Risk Achievement Worth
• Risk Reduction Worth
• Diagnostic Importance Factor

TopEvent FTA有多個版本：Express，Starter，Standard 和 Professional。 

System Requirements
TopEvent FTA runs exclusively on Windows operating systems. Recommended system requirements are:

• Windows Vista SP2, Windows 7 SP1, Windows 8, Windows 8.1, or Windows 10
• 512MB of RAM
• 100MB of free disk space

TopEvent FTA Professional 2016
TopEvent FTA 2016 is interactive software for Qualitative and Quantitative Fault Tree Analysis.

TopEvent FTA Tutorial
Fault Tree for the monopropellant propulsion system of a small space flight vehicle.

TopEvent FTA 2016 is used to construct and evaluate a Fault Tree for the monopropellant propulsion system of a small space flight vehicle. This Fault Tree is included in the Monopropellant Propulsion System Example of the Fault Tree Handbook with Aerospace Applications.