Earl,

A large part of the problem is the use of MTBF. It does not reflect
real world reliability issues.The primary problem is that it does not
cover intermittent/soft failures. In other words when does a "failure" occur?

Documenting any and all anomalies is required to get a clearer picture.

David A. Douthit
Manager
LoCan LLC

Earl Moon wrote:

> Werner and Dave,
>
> Thanks for the input. The froth I'm not yet displaying concerns how the DoD
> folks keep asking for compliance with the standard/spec. There are some
> still asking for use of statistical methods, FMEA processes, and use of 217.
> What's with this? Also, though not asking Werner to give up any secrets
> about his reliability consultancy, what are we "civilians" using as
> prediction methods/standards? I know some, but seems a target rich
> environment beyond past histories, especially concerning "breakthrough"
> technologies, let alone evolutionary types.
>
> All the disk drive manufacturers, as but one minor example, state a MTBF
> number usually around 300,000 hours or more. I've been involved with them
> from a DFM standpoint and some simply have "great" warranty/exchange
> programs. Hope my latest Maxtors hold up for another 300 hours. Sure hope
> "old Jim M's" stuff flies well, as well, oh well.
>
> Reminds me of a Waylon song with verse as my front tracks are headed for a
> cold water well and my back tracks are covered with snow. Willie was part of
> this as well. What comes around?
>
> MoonMan
>
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