Aerospace series - Test methods for transparent materials for aircraft glazing - Part 5: Determination of visible light transmission

This standard specifies the determination of visible light transmission for transparent materials by using a photometer employing a defined light source and a photocell matched to the response of the human eye.
Because the materials under test are basically colourless, certain deviations from ideal conditions, indicated in the test, are allowable.

Luft- und Raumfahrt - Prüfverfahren für transparente Werkstoffe zur Verglasung von Luftfahrzeugen - Teil 5: Messung des Lichttransmissionsgrades im sichtbaren Bereich

Série aérospatiale - Méthodes d'essais pour matériaux transparents pour vitrages aéronautiques - Partie 5: Mesure de la transmission originale dans le visible

Aerospace series - Test methods for transparent materials for aircraft glazing - Part 5: Determination of visible light transmission

General Information

Status
Published
Publication Date
19-Mar-1989
Withdrawal Date
19-Sep-1989
ICS
49.045 - Structure and structure elements
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 4 - Metallic
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
21-Jan-2025
Completion Date
14-May-2025
Directive
305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
89/106/EEC - Construction products
Mandate
M/111 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on circulation fixtures
Ref Project
SIST EN 2155-5:2001 - Aerospace series - Test methods for transparent materials for aircraft glazing - Part 5: Determination of visible light transmission

Overview

EN 2155-5:1989 (CEN) is part of the aerospace series of test methods for transparent materials used in aircraft glazing. This part defines the procedure for the determination of visible light transmission (VLT) using a photometer equipped with a defined light source and a photocell whose spectral response is matched to the human eye. The standard recognizes that aircraft glazing materials are essentially colourless and therefore allows certain deviations from ideal measurement conditions where appropriate.

Key topics and requirements

  • Scope and purpose: Measurement of visible light transmission for transparent aircraft glazing materials to support quality control, conformity assessment and specification compliance.
  • Test equipment: Use of a photometer with a specified light source and a photocell matched to the human eye response (photopic response, V(λ)) to ensure results correlate with human visual perception.
  • Measurement procedure: Instructions for preparing specimens, positioning relative to the instrument, and recording transmitted light; includes requirements for calibration and reference measurements.
  • Permissible deviations: Guidance on allowable departures from ideal conditions when testing essentially colourless materials, acknowledging practical tolerances in production and measurement.
  • Calibration and traceability: Need for instrument calibration against reference standards and maintenance of measurement traceability to ensure repeatability and comparability of VLT results.
  • Reporting: Requirements for documenting test conditions, instrument settings, specimen identification and measured VLT values so results can be interpreted correctly.

Applications

  • Quality control of aircraft windscreens, canopies, windows and transparent cockpit panels where visible light transmission affects safety, comfort and instrument readability.
  • Material selection and incoming inspection for manufacturers of glazing laminates, polycarbonate and acrylic panels used in aviation.
  • Test laboratories performing compliance testing for aircraft component suppliers and certification bodies verifying glazing optical properties.
  • Research and development teams optimizing coatings, tints or treatments to meet specified VLT requirements without introducing unwanted coloration.

Who uses this standard

  • Aerospace manufacturers, glazing suppliers and component fabricators
  • Accredited test laboratories and inspection bodies
  • Certification authorities and aerospace engineers involved in materials qualification
  • Procurement and quality assurance professionals specifying VLT performance

Related standards

  • Other parts of the EN 2155 aerospace series (for additional test methods on transparent materials)
  • National implementations such as SIST EN 2155-5:2001 (Slovenian adoption of EN 2155-5)

Keywords: EN 2155-5:1989, visible light transmission, VLT, aerospace glazing, photometer, aircraft transparent materials, CEN standard.

Frequently Asked Questions

EN 2155-5:1989 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Test methods for transparent materials for aircraft glazing - Part 5: Determination of visible light transmission". This standard covers: This standard specifies the determination of visible light transmission for transparent materials by using a photometer employing a defined light source and a photocell matched to the response of the human eye. Because the materials under test are basically colourless, certain deviations from ideal conditions, indicated in the test, are allowable.

This standard specifies the determination of visible light transmission for transparent materials by using a photometer employing a defined light source and a photocell matched to the response of the human eye. Because the materials under test are basically colourless, certain deviations from ideal conditions, indicated in the test, are allowable.

EN 2155-5:1989 is classified under the following ICS (International Classification for Standards) categories: 49.045 - Structure and structure elements. The ICS classification helps identify the subject area and facilitates finding related standards.

EN 2155-5:1989 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC; Standardization Mandates: M/111. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.

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Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Test methods for transparent materials for aircraft glazing - Part 5: Determination of visible light transmissionLuft- und Raumfahrt - Prüfverfahren für transparente Werkstoffe zur Verglasung von Luftfahrzeugen - Teil 5: Messung des Lichttransmissionsgrades im sichtbaren BereichSérie aérospatiale - Méthodes d'essais pour matériaux transparents pour vitrages aéronautiques - Partie 5: Mesure de la transmission originale dans
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