A fault tree analysis software ensuring reliable calculations and faithful methodological links

The "functioning security" view of the system
Fault tree publisher and quantification thanks to a calculation engine

Easy first use of the fault tree publisher

TDC FTA offers a user-friendly and intuitive start, including for the actual fault tree building. Components and faults can be input directly into the chart that gathers all the tree elements.
As to printing, an Excel export file will insert your results in a study report, in no time.

Powerful and accurate calculation

TDC FTA is powered by a calculation engine. This leaves no place for approximation; Not only AND/OR operators define the tree but also complex (k/n) operators, negation gate...; TDC FTA can launch simulations, manage repeated events, realize minimum cut sets, and more

Rigorous fault tree construction

TDC FTA can be used alone. For any safety and reliability application, fault trees can be created from the functional and material architecture (functions, sub-systems, components, undesirable events, …) as specified in the Functional Block Diagram (TDC Structure software), and from the failure modes and causes as identified on the functions and components in the FMEA study (TDC FMEA software). Consistency between both methods being ensured by the data sharing within TDC engineering software suite.

Capitalizing and tracking

When desired, according to your field of application, TDC FTA enables creating generic fault trees which will capitalize data along the new projects.
Every data traceability is ensured thus facilitating the identification of any changes since last work session, for instance.


Failure probability calculated on the top event, at intermediate node level or on subtrees; this is the true calculation value based on the tree that BDD (Binary Decision Diagram ) defined,

Minimum cut sets calculation in the range of 1 to n, including for non consistent trees (with NOT gates, exclusive OR, ...),

Numerous probability laws for basic elements, among which Constant Law, Exponential Law, Weibull Distribution, GLM (lm), periodic testing, ?

Distribution probability laws: Uniform Law, Lognormal Law,

Importance factors help and calculate the impact of an element on the reliability and availability of a studied system; ARALIA calculates among other factors: the Marginal Importance Factor (MIF), the Critical Importance Factor (CIF), the Diagnostic Importance Factor (DIF), the Risk Achievement Worth (RAW), the Risk Reduction Worth (RRW), ...

Specific Copy/Paste functions: tree branches and its analysis charts,

Multilingual handling of each data, Spellcheck.

Printing in Excel format of data charts, tree and subtrees.

Document and action publishing feature.

See also:

Functional analysis of need

FMEA software

Fault Tree Analysis Software

TDC FTA belongs to Robust Engineering Suite and to Medical Device Suite