SIST EN 3866:2014

Aerospace series - Non-metallic materials - Glass tranparencies - Test methods - Determination of ream and surface ripple

This European Standard defines a qualitative method for the determination of the ream and surface ripple in glass transparencies for aircraft applications.

Luft- und Raumfahrt - Nichtmetallische Werkstoffe - Transparente Glaswerkstoffe - Prüfverfahren - Bestimmung der Riffel- und Oberflächenwelligkeit

Série aérospatiale - Matériaux non-métalliques - Transparents en verre - Méthodes d’essais - Détermination des ondes et des coups de rouleaux

La présente Norme européenne définit une méthode qualitative pour la détermination des ondes et des coups de rouleaux sur les transparents en verre pour les applications aérospatiales.

Aeronavtika - Nekovinski materiali - Prosojnost stekla - Preskusne metode - Ugotavljanje valovitosti izvrtin in površin

General Information

• Status: Published
• Publication Date: 02-Jan-2014
• ICS: 49.025.99 - Other materials
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 23-Dec-2013
• Due Date: 27-Feb-2014
• Completion Date: 03-Jan-2014
• Ref Project: EN 3866:2013 - Aerospace series - Non-metallic materials - Glass tranparencies - Test methods - Determination of ream and surface ripple

Overview

EN 3866:2013 (CEN) defines a qualitative shadowgraph method for the detection of ream and surface ripple in glass transparencies used in aircraft applications. The method is intended to reveal optical distortions and surface irregularities by projecting the shadow of the transparent component onto a matt screen using a homogeneous, high-intensity point light source. This standard is part of the EN aerospace series for non-metallic materials and was prepared under ASD-STAN.

Key Topics

• Principle: A high-intensity point light source illuminates the glass transparency; distortions are visualised as deviations in the shadow cast on a matt white screen (shadowgraph technique).
• Apparatus and environment: A dark room; a high-intensity point light source (200 W to 250 W) capable of creating a homogeneous field; and a matt white screen for shadow observation.
• Typical test geometry (as specified):
  • Glass transparency held parallel to the matt white screen at a distance of 1 000 mm.
  • Light source positioned approximately 3 000 mm from the transparency to produce clear shadows on the screen.
  • The transparency may be slightly angled to confirm whether an observed defect is real or an optical artefact.
• Nature of results: The method is qualitative only. No numerical acceptance criteria are defined in the standard; it reveals the presence and character of ripple or ream defects rather than quantifying them.
• Limitations: Measurement precision is not established because inter-laboratory data are not available. Users should not infer quantitative tolerances from the test.
• Test samples: The test is intended for actual plies / production transparencies rather than laboratory specimens.
• Reporting and traceability: The test report should reference the method, describe apparatus used, identify the product under test, record any deviations or incidents, and provide traceability to equipment and personnel.

Applications

• Manufacturing quality control: Final inspection of aircraft windows, canopies and other glass transparencies for visible ripple or ream defects.
• Acceptance checks: Visual verification during production or prior to assembly where optical clarity and distortion avoidance are critical.
• Maintenance and troubleshooting: Rapid qualitative assessment of in-service transparencies when optical anomalies are reported.

Note: Because EN 3866:2013 is qualitative, manufacturers and maintenance organisations should combine shadowgraph inspection with other techniques or supplier specifications if quantitative acceptance criteria are required.

Related Standards

• EN 4385 - General organisation of standardisation for the EN aerospace series (context for non-metallic material standards).
• EN 4386 - Rules for drafting and presentation of test method standards in the aerospace series.

This standard was prepared under the ASD-STAN process and approved by CEN; users should consult national implementations and document test reports in accordance with the reporting requirements listed in EN 3866:2013.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2014
Aeronavtika - Nekovinski materiali - Prosojnost stekla - Preskusne metode -
Ugotavljanje valovitosti izvrtin in površin
Aerospace series - Non-metallic materials - Glass tranparencies - Test methods -
Determination of ream and surface ripple
Luft- und Raumfahrt - Nichtmetallische Werkstoffe - Transparente Glaswerkstoffe -
Prüfverfahren - Bestimmung der Riffel- und Oberflächenwelligkeit
Série aérospatiale - Matériaux non-métalliques - Transparents en verre - Méthodes
d’essais - Détermination des ondes et des coups de rouleaux
Ta slovenski standard je istoveten z: EN 3866:2013
ICS:
49.025.99 Drugi materiali Other materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 3866
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2013
ICS 49.025.99
English Version
Aerospace series - Non-metallic materials - Glass tranparencies
- Test methods - Determination of ream and surface ripple

This European Standard was approved by CEN on 17 November 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3866:2013: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms, definitions, symbols and abbreviations .5
4 Health, safety and environment .5
5 Principle/technique .5
6 Resources .6
6.1 Apparatus/facilities .6
6.2 Materials/reagents .6
6.3 Qualification of personnel .6
7 Test samples/test pieces .6
8 Test procedure .6
9 Expression of results .6
10 Measurement uncertainties .6
11 Designation .6
12 Test report .7

EN 3866
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