SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: Luke Deng
Organization:Aerospace Industry Development Corp.
Date posted: Thu Mar 29 3:26:28 US/Eastern 2001
Subject: Maintenability Index
What's MAINTENABILITY INDEX meanning in physic and mathematic aspect?
Subject: Maintainability Indices
Reply Posted by: Floyd Kreuze
Date Posted: Tue Apr 3 14:44:30 US/Eastern 2001
Maintainability Index is primarily a mathematical concept. The inquirer should consult the book by Ben Blanchard, "Logistics Engineering and Management", especially Chapter 2 "Measures of Logistics". Maintainability is most often measured using elapsed-time factors such as MMH/MA, MMH/OH, MTTR, Mmax, Mct, Mpt and MDT. These terms are defined in MIL-HDBK-470A (Appendix G) and in Blanchard's book on logistics (see above).
The physics aspects of M Index are a bit remote: (1) Human Engineering, as it deals with things like connector spacings in relation to connector replacement with gloved hands, times to remove and replace mounting screws, etc. (2)Physics of Failure and its impact on MTBF, which in turn influences MTBR, Ao and frequency of maintenance actions.