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BS EN 3475-411:2018 Aerospace series. Cables, electrical, aircraft use. Test methods - Resistance to fluids, 2018
- undefined
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Test fluids
- 5 Procedures [Go to Page]
- 5.1 General [Go to Page]
- 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.
- 5.2 Method 1: occasional contamination test [Go to Page]
- 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.
- 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) [Go to Page]
- 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.
- 5.3.3 Immerse the test two (2) specimen fully in one of the specified test fluid with the ends 150 mm above the surface of the fluid which shall be maintained at the temperature specified in Table 1 for each of fluids listed in EN 3909 or the cable maximum rated temperature whichever is the lowest for (24 ( 1) h.
- 5.3.4 Remove the specimen from the fluid and transfer them to a chamber at (65 ( 2) °C for h.
- 5.3.5 At the end of the period allow the test sample to cool to room temperature, and remain at room temperature for between 1 h and 2 h, before being subjected to final examination.
- 6 Requirements [Go to Page]
- 6.1 The following fluid exposure the specimen shall be. [Go to Page]
- 6.1.1 Visually inspected EN 3475-201.
- 6.1.2 The cable diameter shall be measured EN 3475-203 variation of the overall diameter shall not exceed 5 %.
- 6.2 The coiled part of each sample is then straightened and subjected to one of the following tests. [Go to Page]
- 6.2.1 Specimen (A) shall be subject to the ambient bend test EN 3475-405 followed by the voltage proof test EN 3475-302, as defined in the product standard.
- 6.2.2 Specimen (B) shall be subject to: [Go to Page]
