BS 3475-411:2018 pdf download – Aerospace series – Cables, electrical, aircraft use – Test methods Part 411: Resistance to fluids
This European Standard specifies two methods of determining the fluid resistance of a finished cable.
Method 1: occasional contamination.
Method 2: contamination test.
It shall be used together with EN 3475-100 and EN 3909.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 3475-100, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 100: General
EN 3475-201, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 201: Visual examination
EN 3475-203, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 203: Dimensions
EN 3475-302, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 302: Voltage proof test
EN 3475-405, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 405: Bending at ambient temperature
EN 3475-503, Aerospace series — Cables, electrical, aircraft use — Test methods — Part 503: Scrapeabrasion
EN 3909, Aerospace series — Test fluids for electrical and optical components and sub-assemblies
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
MIL-PRF-87937D, Performance specification: cleaning compound, aerospace equipment 1)
ASTM D740, Standard Specification for Methyl Ethyl Ketone
2) AMS 1476B, Aircraft toilet flush fluid
2) 3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Test fluids Unless otherwise specified in the product standard, all fluids listed in EN 3909 are mandatory.
5 Procedures
5.1 General 5.1.1 Unless specified in the product specification method 2 shall be used. 5.1.2 For each fluid to be tested, take two (2) clean specimen at least off 1 m in length from a finished cable. Where large cables are being tested
a single specimen may be divided into two (2) after fluid exposure if the resulting pieces are of sufficient length to allow the post tests to be correctly carried out. Strip approximately 25 mm of both ends of each specimen. Measure the cable diameter EN 3475-203. 5.2 Method 1: occasional contamination test 5.2.1 Mount the test samples in their normal operating configuration and maintain at room temperature or as specified in the product standard.
5.2.2 Dip, brush or spray the test sample with the specified fluid which shall be maintained at the test temperature given in Table 1, or as specified in the product standard. Ensure that the entire surface of the sample is thoroughly wetted. Allow the sample to drain naturally for 5 min to 10 min; shaking or wiping is not permitted. Transfer the test sample to a test chamber and maintain at the test temperature for the time specified in the product standard. If not specified, the parameters shall be (65 ± 2) °C for  + 0 8 160 h.
5.2.3 At the end of the period allow the test sample to return to room temperature, and remain at room temperature for between 1 h and 2 h, before being subjected to final examination. 5.2.4 Repeat this procedure, if specified by the product standard.
5.3 Method 2: contamination test for aircraft applications (to be conducted unless otherwise specified in the product specifications)
5.3.1 For each fluid to be tested, take two (2) clean specimen at least off 1 m in length from a finished cable. Where large cables are being tested a single specimen may be divided into two (2) after fluid exposure if the resulting pieces are of sufficient length to allow the post tests to be correctly carried out.
5.3.2 Unless otherwise stated in the product standard, each specimen shall be wound seven (7) complete turns onto a mandrel of diameter 12 times the maximum specified outer cable diameter without torsion, but with sufficient tension to ensure the specimen remains fully in contact with the mandrel. Remove the mandrel (if necessary the specimen may be tied using lacing cord so as to retain the coils).