Forum: Reliability & Maintainability Questions and Answers
Posted by: Lae Won Kim (laewonee@rotem.co.kr ) Organization:Rotem Company Date posted: Tue May 6 10:51:12 US/Eastern 2003 Subject: MTTR Message: What is the distributon type of MTTR statistically? If it is a normal distribution, who first demonstrate the ditribution type? Thank you
Posted by: Glen Hanington (ghanington@elgar.com ) Organization:Elgar Electronics Date posted: Fri Apr 11 12:16:45 US/Eastern 2003 Subject: Component Derating Message: I'm looking to upgrade my company's Component Derating Guideline, which was written over 15 years ago. Can you give me some guidance in this? What are the best sources for this type of information as it pertains to today's components?
Posted by: Bob Cerami Date posted: Tue Apr 8 9:51:45 US/Eastern 2003 Subject: maintenance manhour per flight hour Message: Does anyone know a web site that contains the MMH/FH for US Army helicopters?
Posted by: Kevin Silke Date posted: Mon Apr 7 17:43:30 US/Eastern 2003 Subject: MLCC Derating Message: In a power supply we are designing, there is a multilayer ceramic chip capacitor that can see a significant ripple current. Our normal derating criteria in this case is to calculate the temperature rise of the part, ensure that we still have 10C of margin against the rated max temperature in the worst case environment, and add some additional voltage derating if the part temperature gets within 40C of the max rated temperature. But this allows for a significant temperature rise in the part. Is there a limit on the allowable temperature rise that I should be using?
Posted by: David Vermeis (dvvermeis@lambtech.com ) Organization:Lamb Assembly & Test Date posted: Thu Apr 3 11:43:50 US/Eastern 2003 Subject: FRACAS software Message: We are interested in purchasing a FRACAS software package. I would appreciate any advise, suggestions, or opinions regarding available packages. If you have purchased a software package and like it or were disappointed please email me at the address listed below. Thanks for your help. David Vermeis dvvermeis@lambtech.com
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