Looks like you’re using the ATA Chaps to follow up with malfunctions.
As aircraft systems are complex sets of subsystems it’s better for you to follow by subsystems , e.g for Nav ( ATA 34 ) ATA 34-11 , ATA 34-15….etc , just as examples ( ADF, VOR, ILS….etc )
Today’s central computers allow for a quick tracing of malfunctions and those are t…[Read more]
A.B replied to the topic Metrics in Transactional/Service Business Processes in the forum General 17 years, 11 months ago
Read this book – ” Customer Centered Six Sigma: Linking Customers, Process Improvement, and Financial Results ” by Naumann and Hoisington.
It’s a good reference for transactional and service businesses with a lot of practical info.
To answer other questions , it’s better if you specify exactly the field of service.
As far as I understand your disposable ( non repairable ) device is not concerned by infant mortality nor by wearout types of failures.
Therefore it is recommended to use the exponential distribution as the lifetime distribution model to do the testing.
You are using a Type II Censoring of Data. Number of failures is known in advance and c…[Read more]
MIL-STD-105D has evolved into MIL-STD-105E. Both are acceptance-sampling systems developed by the military.
A similar civilian standard is ANSI/ASQC Z1.4 as well as the ISO 2859.
For more details about the MIL-STD-105 follow this link http://www.itl.nist.gov/div898/handbook/pmc/section2/pmc231.htm
or read Montgomery ” Introduction to…[Read more]
My opinion is the ambiguity lies in the fact that you ( or your customer ) have not defined the geometry of your tolerance : in the case of a hole you can face a circular tolerance as well as a rectangular or a square tolerance. Obviously the circular tolerance is the best for you ( keeping symmetrical intervals around the centre of the hole…[Read more]
What do you mean by “perfect” cylinder ? What is your objective ? If you can answer both questions then you can set ” preliminary ” tolerance specs.
It seems that you are not satisfied with the tolerance interval +/- 0.1 , that means you still have not defined your final specs.
Six sigma is not necessarily the key to success. A lot of other companies make profits without using 6 sigma.
The problem with the big Cos is :
– They killed competition slowly : customers have a limited choice for procurement.
– Lack of vision : They haven’t used full potential of their acquisitions and/or mergers. Less products…[Read more]
You should be very careful in planning for the experiment. Looks like you’re adjusting levels so to get at the end the results that you really want to get and that’s may be the reason for the failure of your experiments.
This case is may be typical of mixture experiments.
What are the sub processes ? Have you defined them ? Which…[Read more]
Hi ,- QCI’s SS Primer is an excellent and “flexible” reference. QCI’s Q&A CD is a must have. – Breyfogle’s book ” Implementing Six Sigma ” goes much deeper but covers much more than the ASQ SS BOK. It has a lot of exciting and challenging exercises at the end of each chapter. – Rath & Strong’s Six Sigma Pocket Guide is a very practical and…[Read more]
1 – To find a Z value from a probability p use in EXCEL the following :=NORMSINV(p) and you’ll get the Z value without looking at the table.2 – To find a probability p from a Z value use in Excel the following :=NORMSDIST(z)
SS Ray ,Why don’t you go through this link :http://www.iSixSigma.com/library/content/c020916a.aspand discuss it with your boss ?It might help in solving quite a few problems that you’re ( facing ) about to face before starting your SS Projects.I have found the article simple and very useful.RegardsA.B
Don’t know if this link is helpful , check it. It is however customized to aerospace firms :
Sorry to bother with my question – It is a very sincere + honest one :
Why should SS Recruiters ( or you ) think that you’re exceptional ?. Your answer might help other candidates to apply successfully ( finding a job with a great Co + outstanding salary ) for similar positions.
Thanks in advance for your feedback.
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