1、T f L s CEN PREN*Z591 (PART*C14) 92 3404589 002b900 5 m - A. E.C. M .A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 2591 Part C14 Issue P 1 June 1992 EDITE PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATERIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Mouineau
2、x Cdex -Tl. (1 ) 47.36.98.76 UDC : Key words : ENGLISH VERSION Aerospace series Elements of electrical and optical connection Test methods Part CI 4 - immersion at low air pressure Srie arospatiale Luft- und Raumfahrt Mthodes dessais Prfverfa tiren Organes de connexion lectrique et optique Partie CI
3、 4 - Immersion 6 basse pression atmosphrique Elektrische und optische Verbindungse.xnen.2 Teil CI 4 - Tauchen bei Unterdruck This .Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on gre
4、en paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affec
5、ted, pli ysically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee
6、 for Standardization) for final vote. Wota - Extra copies can be supplied by E.N.A.E. i Teclinopalis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX Edition approved for publication 1992-06-05 Comments should be sent within six months after the date of publication decision A.E.
7、C.M.A. Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cdex - FRANCE C2 Chairman M. J. LE CUNFF 0 aecma 1992 6: CEN PREN*E593 (PART*C/LI) 92 3LI04589 0026903 7 prEN 259 1 -C14 Page 3 1 Scope and field of application This standard specifies a method of demonstrating sealing of
8、 an element of connection immersed in salt water and exposed to low air pressure. It shall be used together with EN 2591. 2 References EN 2591 EN 2591-86 EN 2591-B7 EN 2591-Cl Aerospace series - Elements of electrical and optical connection - Test methods - General Aerospace series - Elements of ele
9、ctrical and optical connection - Test methods - Part B6 - Measurement of insulation resistance 1 ) Aerospace series - Elements of electrical and optical connection - Test methods - Part B7 - Voltage proof test 1) Aerospace series - Elements of electrical and optical connection - Test methods - Part
10、C11 - Low air pressure 21 3 Preparation of specimens 3.1 Specimens shall be fitted with their normal accessories in accordance with the requirements of the technical specification. The test shalt be conducted on elements of connection with protective covers. Unwired cavities shall be fitted with fil
11、ler plugs. A conductor shall be connected to the shell to allow measurements to be made. For elements of connection where the cable termination area is unprotected (e.g. with solder contacts) a means of protection shall be used. At the beginning of the test, the specimen shall not have been contamin
12、ated by any other product before immersion. 3.2 Unless indicated in the technical specification, the following details shall be specified : - mated or unmated elements of connection with protective covers, - type of wire, - insulation resistance, - value of voltage for test EN 2591-B7, - pressure va
13、lue. 1) In preparation at the date of publication of the present standard. 2) Published as AECMA pre-standard at the date of publication of the present standard. .= Previous page is blank CEN PREN*2591 (PART*CLLi) 92 E 340Li589 002b902 9 W prEN 2591-CI4 Page 4 4 Apparatus 4,l Low air pressure chambe
14、r The low air pressure chamber shall be of sufficient size to house the container containing the specimen immersed in the salt solution. Its volume shall not exceed 1 cubic metre. The chamber shall also be provided with a window for visual observation of the specimen. Unless otherwise specified by t
15、he detail specification, a vacuum pump shall allow operators to maintain a 2 kPa pressure. 4.2 Salt solution The salt solution shall be prepared by dissolving 5 % by weight of sodium chloride in deionized water. 5 Method 5.1 Initial measurements (if applicable) Low air pressure (test EN 259 1 -CI 1
16、) 5.2 Test procedure 5.2.1 Immersion The test specimen sllall be immerseL in Ilte solution so that its uppermost point is 25 mm maximum below the upper surface of the solution. The wires shall be brought out along the specimen axis and shall not be submitted to any mechanical stresses. The wires sha
17、ll be so arranged as to be brought out of the solution and the unsealed wire ends shall be located inside the chamber. 5.2.2 Low air pressure cycle 5.2.2.1 The low air pressure chamber shall be sealed The chamber pressure shall be reduced from room ambient to 2 kPa or as otherwise specified by the t
18、echnical sipification within 5 min to 15 min and the above pressure shall be maintained for (30 o) min. 5.2,2.2 The chamber pressure shall then be inccysed to room ambient within 1 min and shall be maintained at room pressure for (30 o) min. The foregoing constitutes one cycle. CEN PREN*Z571 (PART*C
19、L4) 92 W 3404589 O026703 O W prEN 2591-CI4 Page 5 I 1 i 1 cycle . Ambient i pressure -A I I Time in minutes Figure 1 -Test cycle 5.2.2.3 Two additional cycles shall be performed (three cycles in total). The specimen shall remain in the salt solution during measurements. 5.3 Final measurements (if ap
20、plicable) 5.3.1 Measurements of insulation resistance After the third cycle, and while the specimen is still immersed, the insulation resistance shall be measured (test EN 259 1 -B6) 5.3.2 Voltage proof test After the insulation resistance test, and while the specimen is still immersed, a voltage pr
21、oof test shall be performed (test EN 2591-B7). The test voltage shall be applied for a minimum of 5 s. 5.3.3 Visual examination Immediately after the above test, remove the specimen from the and unmate it carefully. The specimen shall be visually examined with particular attention to the following : - evidence of salt water ingress visible to the naked eye, - condition of seals. 5.4 The specimen shall be carefully rinsed and dried after this test. chamber, drain it c
