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The Right Stuff for Aging Electronics/Intermittence/No Fault Found

机译：用于老化电子产品/间歇/间歇/没有故障的正确的东西

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For those in the avionics repair and maintenance business, the acronyms NFF (No Fault Found), NTF (No Trouble Found), and CND (Cannot Duplicate) are, unfortunately, all too familiar terms. After several decades of frustration with this illusive phenomenon, it continues to consume an enormous amount of test and diagnostic effort and is the source of considerable cost and discomfort within the multi-level avionics repair model. There are undoubtedly many causes of NFF and all of them should be addressed. The question is: Where do you start and which solution will be the most beneficial Our particular efforts have focused on the literal or statistical analysis of NFF, recognizing that if the system’s MTBF (Mean Time Between Failure) has decreased, or if the device's NFF rate has increased with age and deterioration, a physical fault is most likely present. However, if it isn’t found during conventional testing then it probably only fails intermittently. Similarly, having an intermittent failure mode, it in all probability cannot be detected or diagnosed at testing time because of known and demonstrated limitations in the conventional measurement equipment used to perform the tests. In this paper we will outline the problem of intermittence and its testing difficulties. More importantly, we will describe the unique equipment and process which has produced overwhelming success in Intermittence / NFF resolution and MTBF extension. Our team-developed overhaul system called IFDIS 2.0 (Intermittent Fault Detection and Isolation System 2.0) incorporates all the necessary testing procedures and technological capabilities that are proving to be critical to the resolution of the chronic intermittent / NFF problem.
机译：对于航空电子设备维修和维护业务的人来说，缩略语是NFF（没有发现故障），NTF（没有遇到麻烦），并且不幸的是，CND（无法复制）都是太熟悉的术语。经过几十年的挫折与这种虚幻的现象，它继续消耗大量的测试和诊断努力，是多级航空电子设备修复模型中相当成本和不适的来源。无疑有许多原因的NFF，所有这些原因都应该解决。问题是：您在哪里开始，哪些解决方案将是我们的特殊努力的最有利的是，我们的特殊努力集中在NFF的文字或统计分析中，认识到，如果系统的MTBF（失败之间的平均时间）减少，或者设备的NFF率随着年龄和恶化而增加，物理故障最有可能存在。但是，如果在常规测试期间找不到它，那么它可能只会间歇性地失败。类似地，具有间歇性故障模式，由于在用于执行测试的传统测量设备中的已知和显示限制，不能在测试时间中检测或诊断到所有概率中的所有概率。在本文中，我们将概述间歇性的问题及其测试困难。更重要的是，我们将描述在间歇性/ NFF分辨率和MTBF扩展中产生压倒性的独特设备和过程。我们的团队开发的大型系统称为IFDIS 2.0（间歇性故障检测和隔离系统2.0）包含所有必要的测试程序和技术能力，这些功能对于慢性间歇/ NFF问题的解决方案至关重要。

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    《SAE AeroTech Europe》|2019年|1 Electronic text data|共4页
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    Hector I. Knudsen;

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