DIN EN 3909:2016-10

The standard DIN EN 3909 specifies the list of test fluids to be used to demonstrate that components and sub-assemblies will not be adversely affected by contamination by fluids types that they may typically be exposed to. The fluids listed are representative of those commonly used and encountered in airborne and ground operations, and align with the requirements of fluids susceptibility of ISO 7137. This shall not be considered an exhaustive list and additional test fluids may be instructed in the product standard, against which compliance needs to be demonstrated. This standard, when used in conjunction with the test requirements defined in Clause 6 or the product standard shall be considered the starting point to test a component to determine its minimum performance capability when exposed to the fluids listed. Test results obtained from a number of sources over a considerable period of time have shown that, in many cases, widely varying results can be obtained when using fluids that are used in service. The practice of specifying fluids based on performance criteria rather than their constituents can mean variations in test results between batches of the fluid obtained from different manufacturers, or even from the same manufacturer. For this reason the EN 3909 Standard recommends the use of "standard test fluids" which are specified by their constituents and contain the chemicals that may be found in commonly used fluids. Where equipment may be exposed to fluid types that are not covered by Table 1 or where additional test fluids are considered to be necessary, the product standard shall identify the particular fluid required. If a manufacturer chooses to include additional test fluids (e.g. to satisfy a customer requirement), they do so at their own risk. Compared to the previous edition DIN EN 3909:2008-09 the following changes have been made: a) the scope of application has been revised, the link to TR 4542 has been removed; b) the normative references have been adapted; c) in Clause 4 it has been specified that the entire specimen is to be immersed in the test liquid; d) the previous clauses on cleaning and initial inspection have been removed; e) instead of the previous two, there is now only one test method (Clause 5); f) Clauses 6 and 7 now include the topics of test temperatures and health and safety; g) Table 1 with the test liquids has been expanded to include biofuel, the test liquid numbers have been changed, the references included have been updated, several notes have been included and the table has been editorially revised; and h) Clause 10 now contains statements on the individual test liquids. The standard EN 3909 has been prepared by the ASD-STAN, Technical Section Electronics, with the participation of German experts from DIN Standards Committee Aerospace (NL). AeroSpace and Defence Industries Association of Europe - Standardization (ASD-STAN) has been declared responsible by the European Committee for Standardization (CEN) for preparing European Standards (EN) for the field of aerospace. The responsible German standardization committee is Working Committee NA 131-04-10 AA "LWL und LWL-Komponenten" ("Fibre optic cables and components") at DIN Standards Committee Aerospace (NL).