| 词条 | No fault found |
| 释义 |
If there is an underlying fault that has not been detected the unit may be returned for repair several times with no fault identified. Alternative descriptors include:[4]
The NFF problemAs the figure shows once a fault has been reported, investigated, and no fault found any future problems caused by the fault cause additional work which is a waste of maintainer time. Different causes have been suggested for this issue.
The fact remains that no fault found causes a cost to industry. NFF is thought to cost the United States Department of Defense in excess of {{US$|2 billion}} per year.[5]
CausesNTF returns are often caused by the following patterns:
ImpactNTF returns can seriously erode profit margins for manufacturers and service providers. The time, materials, and shipping costs in exchanging hardware is enormous in relation to the cost of the item being replaced. Further, NTF returns can also indicate that customers' problems have not been resolved, and thus imply reduced customer satisfaction and eroded brand value. DefenseSeveral methods are available to reduce NTF events:
Example of abuseNTF reduction must be performed in a thoughtful manner. Reportedly a major PC manufacturer attempted to eliminate NTF returns by charging back the cost of any NTF item to its service organization. This greatly increased the motivation of the service organization to only return defective parts from customer service calls. The goal was quickly met, with only few parts being identified as NTF, though the overall number of parts being returned did not significantly change. An investigation into the suddenly much higher part failure rate discovered that service engineers were routinely causing damage to parts that were being exchanged, so that they would not be liable for the cost of any related NTF event. The NTF charge-back program was quickly abandoned thereafter in this example of unintended consequences. References1. ^{{cite journal|last1=Söderholm|first1=Peter|title=A system view of the No Fault Found (NFF) phenomenon|journal=Reliability Engineering & System Safety|date=January 2007|volume=92|issue=1|pages=1–14|doi=10.1016/j.ress.2005.11.004}} 2. ^{{cite journal|last1=James|first1=I.|last2=Lumbard|first2=D.|last3=Willis|first3=I.|last4=Goble|first4=J.|title=Investigating no fault found in the aerospace industry|journal=Reliability and Maintainability Symposium, 2003. Annual|date=1 January 2003|pages=441–446|doi=10.1109/RAMS.2003.1182029|url=http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1182029&tag=1|isbn=978-0-7803-7717-2}} 3. ^{{cite journal|last1=Qi|first1=Haiyu|last2=Ganesan|first2=Sanka|last3=Pecht|first3=Michael|title=No-fault-found and intermittent failures in electronic products|journal=Microelectronics Reliability|date=May 2008|volume=48|issue=5|pages=663–674|doi=10.1016/j.microrel.2008.02.003}} 4. ^{{cite journal|last1=Khan|first1=Samir|last2=Phillips|first2=Paul|last3=Jennions|first3=Ian|last4=Hockley|first4=Chris|title=No Fault Found events in maintenance engineering Part 1: Current trends, implications and organizational practices|journal=Reliability Engineering & System Safety|date=March 2014|volume=123|page=183|doi=10.1016/j.ress.2013.11.003|url=http://www.sciencedirect.com/science/article/pii/S0951832013003001}} 5. ^{{cite news|last1=Werner|first1=Debra|title=Aerospace America|url=http://www.aerospaceamerica.org/Documents/Aerospace%20America%20PDFs%202015/February2015/Feature1_AA_Feb2015.pdf|accessdate=15 April 2016|issue=2|publisher=AIAA|date=February 2015}} External links
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