Forum: Reliability & Maintainability Questions and Answers

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Posted by: Scott Tamashiro (smtamashiro@west.raytheon.com )
Organization:Raytheon
Date posted: Thu Mar 29 17:26:46 US/Eastern 2001
Subject: TWT Power Levels
Message:
Hello,
An inquiry came up regarding the TWT failure rate model. Although the 217F2 handbook provides a range for rated power (1 mW to 40 kW) as a parameter, I am interested as to what the actual field power levels were that formed the 217F TWT failure rate equation. I was wondering what power levels (up to 500W? up to 1kW?) are represented in the dataset EIA Microwave Tube Divsion provided. Thank you, Scott

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TWT Power Levels
David Dylis Fri Mar 30 12:01:32 US/Eastern 2001

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Posted by: Cathy
Date posted: Thu Mar 29 17:21:13 US/Eastern 2001
Subject: Passive Component "Uprating"
Message:
Is there any standard or guideline for passive component uprating? Actually I need the justification for PiT used in MIL-HDBK-217 prediction. For example, what's the PiT of a resistor (rated at 150C) at 240C? Thanks.

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Passive Component "Uprating"
David Dylis Mon Apr 9 9:03:33 US/Eastern 2001

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Posted by: Luke Deng (luke1024@kimo.com )
Organization:Aerospace Industry Development Corp.
Date posted: Thu Mar 29 3:26:28 US/Eastern 2001
Subject: Maintenability Index
Message:
What's MAINTENABILITY INDEX meanning in physic and mathematic aspect?

Replies: (list all replies)
Maintainability Index
Ned H. Criscimagna Thu Mar 29 14:21:09 US/Eastern 2001
Maintainability Indices
Floyd Kreuze Tue Apr 3 14:44:30 US/Eastern 2001

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Posted by: Jim Miller (jim_e_miller@udlp.com )
Organization:United Defense, L.P.
Date posted: Wed Mar 28 14:16:21 US/Eastern 2001
Subject: Reliability Prediction Confidence Level
Message:
We are being asked to provide a confidence level (percent) to our current reliability prediction of a Navy mechanical/electrical/electronics system still in preliminary design. Several areas of the design are still in the "maybe it will be like this" stage. Prediction data sources currently include a mix of handbook, data supplied from hopeful vendors, 217, and Navy / Army failure rate data of similar items we may be using in the new design. Can a confidence level be assigned or calculated at this stage of the prediction, or at any stage of the prediction? If so, is there an established methodology for doing so? We understand that as the design goes forward and actual hardware is specified and tested, and subassemblies are built and tested, we can incorporate vendor data, testing data, FRACAS data, etc. into the prediction, thereby increasing our "confidence" in the prediction. But can this confidence ever be quantified?

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Reliability Prediction Confidence Levels
B. W. Dudley Wed Mar 28 16:18:46 US/Eastern 2001

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Posted by: J dudley (Jonathon.dudley@baesystems.com )
Organization:BAE
Date posted: Tue Mar 20 10:36:37 US/Eastern 2001
Subject: Testability sample sizes
Message:
Sample sizes for testability demostrations MIL hdbk471 seems to be very a little miss leading as towards the sample size required to test for T demos.Could some body explain thier own theory on the methods published in this standard. We belive that 10 percent of the fault catalog should be demostrated.

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Testability Sample Sizes
Bruce Dudley Mon Mar 26 15:17:32 US/Eastern 2001

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