SIST EN 3863:2014

Aerospace series - Non-metallic materials - Glass transparencies - Test methods - Determination of flatness

This European Standard defines the requirements for the determination of the flatness of monolithic glass transparencies for aircraft applications. The method is designed to eliminate the effect of the glass deflecting under its own weight, thus eliminating false results.

Luft- und Raumfahrt - Nichtmetallische Werkstoffe - Transparente Glaswerkstoffe - Prüfverfahren - Bestimmung der Ebenheit

Diese Norm legt die Anforderungen zur Bestimmung der Ebenheit von transparenten Glaswerkstoffen zur Anwendung in Luftfahrzeugen fest. Das Verfahren ist zur Eliminierung der Glasdurchbiegung durch das Eigengewicht ausgelegt, um so falsche Ergebnisse auszuschließen.

Série aérospatiale - Matériaux non-métalliques - Transparents en verre - Méthodes d’essais - Détermination de la planéité

La présente Norme européenne définit les exigences pour la détermination de la planéité des transparents en verre monolithique pour les applications aérospatiales.  La méthode est conçue pour éliminer les effets de déformation du verre sous son propre poids, en éliminant donc les faux résultats.

Aeronavtika - Nekovinski materiali - Prozornost stekla - Preskusne metode - Ugotavljanje ploskosti

General Information

• Status: Published
• Publication Date: 12-Jan-2014
• ICS: 49.025.99 - Other materials
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Jan-2014
• Due Date: 13-Mar-2014
• Completion Date: 13-Jan-2014
• Ref Project: EN 3863:2013 - Aerospace series - Non-metallic materials - Glass transparencies - Test methods - Determination of flatness

Overview

EN 3863:2013 - "Aerospace series - Non-metallic materials - Glass transparencies - Test methods - Determination of flatness" is a CEN standard that specifies a test method for measuring the flatness of monolithic glass transparencies used in aircraft. The procedure is designed to remove the effect of the glass deflecting under its own weight (self-weight deflection), preventing false flatness results and helping ensure reliable, repeatable measurements.

Key topics and technical requirements

• Scope: Flatness determination for monolithic aircraft glass transparencies.
• Test principle: Hold the transparency vertically so its mean plane is parallel to a defined reference plane; measure the gap to the reference plane with wedge gauges at predetermined positions.
• Apparatus:
  • Support stand with two nearly vertical side-members (side-members fixed to within 0.1 radian of vertical) and drilled peg positions.
  • Steel straight edge larger than the stand, supported on pegs.
  • Pegs, three adjustable support pads and wedge feeler gauges.
• Setup parameters: Transparency set with an average gap of 1–2 mm from the reference plane.
• Measurement grid: Measure gaps at 100 mm horizontal intervals across the width; move the straight edge 100 mm vertically and repeat. Continue at 100 mm vertical intervals until the full area is covered.
• Accuracy and recording: Measurements to ±0.1 mm, recorded in millimetres to one decimal place. Compute the arithmetic mean of all gaps, subtract the mean from each measurement, and present the differences in chart form.
• Notes: Thermally tempered glass that was tong-supported in the furnace may require higher measurement frequency. A computerized measurement system with equal or better accuracy is acceptable.
• Uncertainty: Precision unknown due to lack of inter-laboratory data.
• Test report must include: test method reference, apparatus designation, relevant test information, product identification and traceability, results, traceability to apparatus and personnel, incidents, deviations, and test date.

Applications and users

• Who uses EN 3863:2013: aerospace glazing manufacturers, aircraft component suppliers, materials test laboratories, quality/inspection engineers, procurement/specification teams, and certification authorities.
• Practical applications:
  • Incoming inspection and production quality control of windscreens and windows.
  • Verification of design/manufacturing process control to avoid optical distortion.
  • Supporting conformity evidence for aerostructure certifications where transparency flatness affects visibility and instrumentation.
  • Comparative testing and R&D when evaluating new glass processing methods.

Related standards

• EN 4385 - General organisation of standardisation for aerospace non-metallic materials (series overview).
• EN 4386 - Rules for drafting/presentation of test method standards (applies to preparation of EN 3863).

Keywords: EN 3863:2013, flatness test, glass transparencies, aerospace, wedge gauges, reference plane, monolithic glass, aircraft glazing, test method.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aeronavtika - Nekovinski materiali - Prozornost stekla - Preskusne metode - Ugotavljanje ploskostiLuft- und Raumfahrt - Nichtmetallische Werkstoffe - Transparente Glaswerkstoffe - Prüfverfahren - Bestimmung der EbenheitSérie aérospatiale - Matériaux non-métalliques - Transparents en verre - Méthodes d’essais - Détermination de la planéitéAerospace series - Non-metallic materials - Glass transparencies - Test methods - Determination of flatness49.025.99Drugi materialiOther materialsICS:Ta slovenski standard je istoveten z:EN 3863:2013SIST EN 3863:2014en01-februar-2014SIST EN 3863:2014SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3863
January 2013 ICS 49.025.99 English Version
Aerospace series - Non-metallic materials - Glass transparencies - Test methods - Determination of flatness
Série aérospatiale - Matériaux non-métalliques - Transparents en verre - Méthodes d'essais - Détermination de la planéité
Luft- und Raumfahrt - Nichtmetallische Werkstoffe - Transparente Glaswerkstoffe - Prüfverfahren - Bestimmung der Ebenheit 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 worldwide for CEN national Members. Ref. No. EN 3863:2013: ESIST EN 3863:2014
...