1、U- Draft for Public Comment Document DC 97/703900Dc Latest date for receipt of comments Project No 97 1236 31 May 1997 Our ref Date 26 February 1997 ACE/ 6 / 2 Sub-camittee ACE/6/2 Aerospace - Cables DRAFT EuRLIpEAN SIANDARD - PIEROSPACE SERIES CABLES ELEETRICAL AIRCRAFT USE TEST METHom PART 413 - W
2、RAP BACK TEST This draft is now available for public comment and your views and technical comments on it would be appreciated. If you have no specific comments to make but nd it generally acceptable it would be helpful if you would notify us accordingly Suggestions entailing revision of the text sho
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8、S RESEARCH GROUP CIVIL AVIATION AUTHORITY EUROPEAN SPACE AGENCY MINISTRY OF DEFENCE SOCIETY OF BRITISH AEROSPACE COMPANIES LIMITED - A2 - 97/703900 prEN 3475-413 DRAFT EUROPEAN (AECMA) AEROSPACE STANDARD This DPC refers to a draft text currently at the PPN ballot stage within a Technical Committee o
9、f AECMA (The European Association of Aerospace Industries)”. The voting period within the AECMA Technical Committee is two months from the date of despatch of the document and this will be completed before the expiry of the DPC comment date. Any comments received as a result of the DPC, after the ex
10、piry of the PPN ballot, will be reviewed by the BSI Committee and taken into account when they consider the UK view and vote on a possible BS EN publication. AECMA consists of the national aerospace trade associations from nine European countries, the UK member being SBAC (Society of British Aerospa
11、ce Companies). AECMA has been given a mandate by CEN to prepare all European aerospace standards on its behalf. NORME EUROPEENNE EUROPISCHE NORM EUROPEAN STANDARD prEN 3475 Part 413 Edition : OCTOBER 1996 Replaces issues : CDU : 621 316 57 : 629.7 Keywords : Aircraft Industry, aircraft equipment, le
12、ctrical cables, test Luft - und Raumfahrt Elektrischen Leitungen fr Luftfahrt Verwendung Prfung 41 3 - Wickelprfung AECMNC2 (Sec.) Etude : C2/02 English Version Aerospace series Cables electrical aircraft use Test methods Part 413 - Wrap back test Srie arospatiale Cbles lectriques Mthodes dessais Pa
13、rtie 413 - Controle par enroulement du scellement DRAFT PROJET ENTWURF Master document 10196 prEN 3475 - 413 page left intentionally blank Page 2 prEN 3475 - 413 Page 3 1. SCOPE AND FIELD OF APPLICATION This standard specifies a method for detecting cracking, porosity and bad adhesion of the various
14、 layers of PTFE insulation tape on a finished cable. It shall be used together with EN 3475-1 OO. 2. REFERENCES EN 3475-100 EN 3475-302 Ae.ospace senes - Cables, electrical, aircraft use - Test methods, Pari 100 - General Aerospace series - Cables, electrical, aircraft use - Test methods, Pari 302 -
15、 Voltage proof test 3. PREPARATION OF A SPECIMEN The preparation of a specimen shall consist in winding a sufficient length 01 completed cable around itself at least 1 O times, so that the cable itself acts as a mandrel. 4. APPARATUS An air circulating oven shall be required for this test. 5. METHOD
16、 5.1 . Procedure The prepared specimen shall be placed in the oven at a temperature of (31 O +5)“C for 2 h. After the 3 h, the specimen shall be removed from the oven and cooled for at least 1 h at ambient temperature. 5.2 . Requirements After being returned to ambient temperature the PTFE cable insulation shall show no cracking or debonding of layers along the insulation. The specimen shall pass the voltage proof test requirements specified in EN 3475-302 : - after being wound before aging, - after aging ,still wound, - after being unwound and straightened.
