Forum: Reliability & Maintainability Questions and Answers

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Posted by: Julien Nico (JNico@zodiac.com )
Organization:Aérazur - Zodiac Group
Date posted: Thu Apr 26 8:42:37 US/Eastern 2001
Subject: MTBF calculation for new components in utilization
Message:
Could someone provide me information on the way how to calculate MTBF of a new component in utilization.
My component is installed on aircraft (this type of aircraft is only use since one year and fleet still increase). I know the cumulative fleet flight hour (which is 20,000 FH). Quantity per aircraft is 3 Fields data are two components have been removed and only one failure have been confirmed (the other was no fault found). I think the MTBF is: MTBF = 3*20,000 / 1 = 60,000 FH. MTBUR = 3*20,000 / 2 = 30,000 FH. Could you please confirm if I'm right or not (and give to me the correct way to calculate it)

Replies:
MTBF Aircraft
Bruce Dudley Thu Apr 26 11:31:30 US/Eastern 2001

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Posted by: Johnson Wood
Date posted: Wed Apr 25 23:09:06 US/Eastern 2001
Subject: Burn-in
Message:
We now conduct burn-in on board level for 24 hours, but we think the burn-in condicitons and duration may be different for various types of part, board, and system. Are there any references or standards on this? Thanks.

Replies: (list all replies)
Burn-in Testing
Bruce Dudley Thu Apr 26 13:19:57 US/Eastern 2001
Burn-in at different levels
Larry George Sat Apr 28 14:31:39 US/Eastern 2001

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Posted by: Bob Valerius (robert_m_valerius@md.northgrum.com )
Organization:Northrop-Grumman Oceanic & Naval Systems
Date posted: Tue Apr 24 12:19:36 US/Eastern 2001
Subject: Reliability Data on a bladder for hydraulic fluid
Message:
Hi
We are looking for any information on reliability data of a bladder for a hydraulic reservoir. This is in concept phase so the exact material and properties are unknown. If anyone has any suggestions for bladder material and other physical characteristics please advise. Pressure is expected to be 0 - 500 psig, temperature is expected to be between 0 and 35C. Thanks in advance.

Replies:
Reliability Data on a bladder for hydraulic fluid
Gary Sunada Mon Apr 30 15:12:58 US/Eastern 2001

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Posted by: Kang
Date posted: Tue Apr 17 13:05:55 US/Eastern 2001
Subject: Telecommunication reliability
Message:
Could someone provide me some good standards, guidelines, and/or websites about telecommunication reliability? Thanks a lot.

Replies:
Re: Telecommunication reliability
Richard Smith Tue Apr 17 13:35:24 US/Eastern 2001

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Posted by: Richard Smith
Date posted: Thu Apr 12 14:26:10 US/Eastern 2001
Subject: Sparing Estimations
Message:
Can somebody point me to good reference (or better still a website) that goes through some sparing estimations based on equipment MTBF and mission times ?
Thanks in advance. Richard.

Replies:
Sparing Estimations
Ned Criscimagna Wed May 2 9:42:14 US/Eastern 2001

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