Reliability HotWire: eMagazine for the Reliability Professional
In this issue:

Issue 24, February 2003

*Hot Topics
*Reliability Basics
*Tool Tips
*Hot News
*Contribute to HotWire

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Hot Topics  
Imperfect Repair 
In many cases, at the conclusion of a repair, preventive maintenance action or inspection for a component, it is assumed that the component is returned to an as good as new condition (or replacement). This means that the age of the component is returned to time equals zero. However, this may not always be the case. In fact, the age of the component after the repair may be a percentage of its age at the time when the repair took place. BlockSim 6 allows you to specify a restoration factor, which is used to determine the age of the component once the maintenance action has been completed. This article will explore the concept of the restoration factor and how it can be applied within BlockSim.

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Reliability Basics  

Design of Reliability Tests
In a past issue of the Reliability Edge (see Cumulative Binomial for Test Design and Analysis), an article was presented on the cumulative binomial distribution and how it can be applied towards test design. Given a specified reliability at a certain time along with a desired confidence level, the required test units (given test time) can be determined to meet the required goal. Calculating the required number of test units is fairly straightforward if the test time is equal to the time at the reliability goal. If this is not the case, then a failure distribution needs to be assumed so that the calculations can be completed. This article presents how this failure distribution can be applied to generate the results using Weibull++ and illustrates the concept of allowable failures.

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Tool Tips  
  • How can I specify which icons are visible on the Data Folio Control Panel in Weibull++?

  • Since temperature values must be entered into ALTA in absolute scale, is there a way to automatically convert temperature values in the Data Folio that are in Celsius and Fahrenheit to Kelvin or Rankine?

  • How can I find out about ReliaSoft's software validation and QA practices?

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Hot News
* Announcing Special Pre-Release Pricing on Xfmea - Xfmea is scheduled for release in late March 2003 and will retail for $1995. When you order Xfmea before the official product release, you will receive a $400 discount off of the standard price! Xfmea has been designed to facilitate the FMEA/FMECA process and provide flexible data management and reporting capabilities. Xfmea supports major industry standards (SAE J1739, AIAG FMEA-3, SAE ARP5580 and MIL-STD-1629A) and guidelines (ISO 9000, QS 9000, ISO/TS 16949 and Six Sigma), while also allowing users to configure the software to the company's specific analysis and reporting procedures. For more information, please visit:
* ReliaSoft at RAMS - Thanks to everyone who stopped by our booth at the 49th Annual Reliability and Maintainability Symposium (RAMS) last month. It was great seeing our old friends and fun making new ones. We look forward to hearing more from you over the course of the year!
* Calendar of Public Events:


Master the Subject, Master the Tools Training Seminar for life data analysis, accelerated life data analysis and system reliability analysis: February 24 - 28, 2003 in Tucson, AZ. For more information, see


National Manufacturing Week 2003 - ReliaSoft will be in Chicago, IL March 3 - 6, 2003 to participate in the National Manufacturing Week 2003 show. ReliaSoft will have a booth in the exhibition hall where you can get information and demonstrations of ReliaSoft's products and services. For more details on this event, please visit (register by February 17th for free admission to the exhibits).
San Diego - Accelerated Testing Training - ReliaSoft will again teach the RAC's Accelerated Testing Training Course on March 4 - 6, 2003 in San Diego, CA. Topics for this course include accelerated life testing and how it is applied, overview of stress loading models and analysis, applicable life-stress relationship models and predicting reliabilities, warranty times and MTTFs (MTBFs) using accelerated life data. For more information on course content and how to register, contact RAC at 1.888.RAC.USER or +1.315.337.0900.
Advanced System Analysis and BlockSim Training Seminar - March 24 - 26, 2003 in Tucson, AZ. An intensive theoretical and hands-on course (utilizing BlockSim) which exposes the attendee to the advanced concepts, principles and requirements for performing detailed system reliability, maintainability, availability and related analyses. For more information, see
Failure Modes, Effects and Criticality Analysis Training Seminar - March 27 - 28, 2003 in Tucson, AZ. This course offers an overview of FMEA/FMECA analysis procedures with emphasis on the use of the Xfmea software. For more information, see
- April Quality Expo International 2003 - On April 15 - 17, 2003, ReliaSoft will be in Chicago, IL once again to perform demonstrations and provide information on ReliaSoft's variety of products and services. Please visit the following link for more information on the show:
QALT Boot Camp Training Seminar - April 30 - May 2, 2003 in Tucson, AZ. This intensive three day course covers advanced topics, concepts and applications of quantitative accelerated life testing (QALT) analysis and ReliaSoft's ALTA PRO software. For more information, see
- May Rio de Janeiro International Reliability Symposium - During this symposium, held May 8 - 9, 2003 in Rio de Janeiro, Brazil, engineers will be examining current reliability practices, issues and applications through lectures and discussions - featuring experts and practitioners from both academia and industry. This symposium is sponsored by ReliaSoft Brasil.
Contribute to HotWire
Contributions Welcomed
As always, your feedback and contributions are appreciated. ReliaSoft is able to provide the most user-friendly reliability software packages and support because we listen to our customers. This applies to our newsletters and publications as well. We welcome any suggestions or contributions you may have for Reliability HotWire. If you have a topic or article that you think would be useful to the readers of Reliability HotWire, feel free to contact us.

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