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40 The PCB Magazine • September 2016 This month we will dive into the testing of aerospace and military product. These designs require special processing in many cases above and beyond the IPC standards. The main speci- fications used when testing military product are MIL-PRF-55110, MIL-PRF-50884 and MIL- PRF-31032. All of these specifications have gone through revision changes over the years so for the sake of our discussion today I will only be referencing the current revisions as of today. From a testing perspective in today's electri- cal test theatre, the question of whether flying probes can be used to test this type of product is quite common. Historically, fixture testers were used for testing military and aerospace product. With the complexity of designs today and the cost of manufacturing fixtures, the requirement for testing on fixtures is not always the case. As of September 2015, IPC released revi- sion "D" of the IPC-6012 Specification for the Qualification and Performance Specification for Printed Wiring Boards. Historically there was an appendix in the specification for Aerospace and Military Avionics. For electrical test this was important as it stated requirements above and beyond the IPC-Class 3/C standard. With the release of revision "D" of the specification there was also a separate release of IPC-6012DS. This supplemental document titled Space and Mili- tary Avionics Applications Addendum to IPC- 6012D moves the historic appendix to this new document. This should be reviewed for changes from the previous revisions. The main document reference for standard testing still remains IPC-9252A w/Amendment 1. This document still outlines the methodology by Todd Kolmodin GARDIEN SERVICES USA Testing Military/Aerospace— Houston, We Have a Solution FEATURE COLUMN: TESTING TODD