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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: L.W.Kim (laewonee@rotem.co.kr )
Organization:Rotem Company
Date posted: Tue May 6 10:48:59 US/Eastern 2003
Subject: Preventive Maintenance Interval
Message:
hi, i'm going to determine preventive maintenance interval and required man-hour of Railway rolling stock. Because it is new rolling stocks, there are much difficulty and risk in determining the interval and man-hour by top-down method not considering development possibility. So, as contingency i'm considering bottom-up method; receiving maintainability analysis data(including P/M type, interval, man-hour, required material, C/M man-hour, required material) from sub-system suppliers. Then based on these data, evaluating the feasibility of my determination. Is it right methodology? Can maintainability analysis provide these data with reliability? Thanks.


Reply:

Subject: Maintability Preventive Maintenance
Reply Posted by: B.W.Dudley (bdudley@alionscience.com )
Organization: RAC
Date Posted: Wed May 7 9:49:21 US/Eastern 2003
Message:
Performing a preventive maintenance analysis at the system level is both a bottom up and top down analysis. You are correct to collect the sub-system supplier information. What you need to do in-addition, is determine the system modes of operation and stress levels so that the number and length of the preventive maintenance can be translated to the system level. For example, if the bearing need periodic lubrication and sub- supplier says once per week, but the bearing load is high, then one needs to reconsider the pattern and perform more maintenance. The RAC has a Maintainability Toolkit that has information that could be helpful in this type of analysis.


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