oSIST prEN 4876:2021

Aerospace series - Environmental testing - Durability of the displays by general usage

This document provides a series of testing methods to determine the resistance of the digital display during general usage in an aircraft cabin. The document applies to any passive and interactive displays. It includes also dirt affinity and cleanability.
The testing methods include the determination of the durability of touchscreen surfaces, signing pads and general displays against human fingertip and hand abrasion, fingerprint and dirt affinity under the usage by humans as can occur during everyday operation inside an aircraft cabin. Additionally, the resistance against general abrasion, scratch and mar on the displays as well as the resistance study against the routine cleaning procedure conducted inside the aircraft is defined.
The test methods are also suitable to test the durability of a display surface against all low and high dynamic strains.

Luft- und Raumfahrt - Umweltprüfung - Beständigkeit der Displays bei allgemeiner Nutzung

Série aérospatiale - Essais d'environnement - Durabilité des affichages d'utilisation générale

Le présent document fournit une série de méthodes d’essais permettant de déterminer la résistance des affichages numériques d’utilisation générale dans une cabine d’aéronef. Ce document s’applique à tous les affichages passifs et interactifs. Il traite également de l’affinité avec la saleté et de la nettoyabilité.
Les méthodes d’essais visent, entre autres, à déterminer la durabilité des surfaces d’écrans tactiles, des pavés de signature et des affichages généraux soumis à l’abrasion par le doigt et la main de l’homme, et l’affinité avec les traces de doigts et la saleté que peut impliquer une utilisation de ces éléments au quotidien par les personnes à l’intérieur d’une cabine d’aéronef. Par ailleurs, la résistance à l’abrasion générale, à la rayure et l’éraflure des affichages, ainsi que la résistance à la procédure courante de nettoyage à l’intérieur de l’aéronef sont également analysées.
Les méthodes d’essais sont également adaptées à l’évaluation de la durabilité de la surface d’un affichage face à toutes les contraintes dynamiques faibles et élevées.

Aeronavtika - Okoljski preskusi - Trajnost zaslonov za splošno uporabo

General Information

• Status: Not Published
• Public Enquiry End Date: 23-Jun-2021
• ICS: 31.120 - Electronic display devices
• ICS: 49.095 - Passenger and cabin equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 08-Apr-2021
• Due Date: 26-Aug-2021
• Completion Date: 22-Jun-2021
• Ref Project: prEN 4876 - Aerospace series - Environmental testing - Durability of the displays by general usage

Overview

prEN 4876 - "Aerospace series - Environmental testing - Durability of the displays by general usage" (CEN draft) defines a suite of test methods to assess the durability of cabin displays under everyday human use. It applies to both passive and interactive displays (touchscreens, signing pads, general displays) installed in aircraft cabins and covers resistance to fingertip and hand abrasion, fingerprint and dirt affinity, scratch/mar, general abrasion, and cleanability. The methods are suitable for low and high dynamic strains typical of aircraft interiors.

Key topics and technical requirements

• Fingertip and hand abrasion tests: Simulate touch, swipe and zoom motions using an elastic test piston and defined fabric media to reproduce pressure, friction and wear (references and fabric/media options are given; test speeds may include 60 mm/s and higher speeds such as 200 mm/s).
• Fingerprint affinity: Reproducible deposition of fingerprint-like media using a silicone stamp and controlled film thickness to quantify visible imprint and surface susceptibility.
• Scratch and mar tests: Protocols for impact-plus-slide and mar-only movements using representative counterparts (metal, pens, plastics, leather, textiles). Two damage zones are identified and evaluated.
• General abrasion tests: Repeated rubbing under defined conditions to evaluate long-term surface wear and resistance.
• Dirt affinity and cleanability: Methods to assess how readily soils adhere to display surfaces and how effective routine aircraft cleaning procedures are at restoring appearance and function.
• Test apparatus, preconditioning and measurements: Detailed description of apparatus, fabrics, test media, severity levels, preconditioning, initial/intermediate/final measurements, recovery and documentation (visual evaluation, water drop angle, topographical analysis, Micro‑Calotest).
• Reporting: Test reports must include relevant information as specified (see document section on test report content).

Applications and users

• Aircraft OEMs and interior designers validating cabin display durability and passenger experience.
• Display and touchscreen manufacturers developing coatings, glass/plastic substrates and anti-fingerprint treatments.
• Certification and qualification engineers performing environmental and usability testing for cabin equipment.
• Independent test laboratories and MRO organizations assessing long-term wear, cleaning procedures and serviceability of in‑flight displays.

Related standards

• prEN 4860 - Abrasion of markings, letterings, surfaces and materials caused by rubbing of fingertips and hands (referenced normative document).
• ISO/IEC terminologies and other ASD‑STAN aerospace environmental test standards for complementary test methods.

prEN 4876 is essential when specifying and verifying touchscreen durability, fingerprint resistance, scratch/mar protection and cleanability for aircraft cabin displays to ensure reliability, safety and a quality passenger experience.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2021
Aeronavtika - Okoljski preskusi - Trajnost zaslonov za splošno uporabo
Aerospace series - Environmental testing - Durability of the displays by general usage
Luft- und Raumfahrt - Umweltprüfung - Beständigkeit der Displays bei allgemeiner
Nutzung
Série aérospatiale - Essais d'environnement - Durabilité des affichages d'utilisation
générale
Ta slovenski standard je istoveten z: prEN 4876
ICS:
31.120 Elektronske prikazovalne Electronic display devices
naprave
49.095 Oprema za potnike in Passenger and cabin
oprema kabin equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2021
ICS 31.120; 49.095
English Version
Aerospace series - Environmental testing - Durability of
the displays by general usage
Série aérospatiale - Essais d'environnement - Luft- und Raumfahrt - Umweltprüfung - Beständigkeit
Durabilité des affichages d'utilisation générale der Displays bei allgemeiner Nutzung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4876:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General test description . 5
4.1 General. 5
4.2 Fingertips and hand abrasion test . 5
4.3 Fingerprint affinity . 6
4.4 Scratch and mar tests . 6
4.5 General abrasion tests . 7
4.6 Dirt affinity test . 7
4.7 Cleanability test . 8
5 Description of the test apparatus . 8
5.1 Fingertip and hand abrasion test . 8
5.1.1 General. 8
5.1.2 Test fabric . 8
5.1.3 Test media . 8
5.2 Fingerprint test for cabin touch screens . 8
5.2.1 General. 8
5.2.2 Test fabric . 9
5.2.3 Test media . 9
5.3 Scratch and mar tests . 9
5.4 General abrasion tests . 9
5.5 Dirt affinity test . 9
5.5.1 General. 9
5.5.2 Test fabric . 9
5.5.3 Test media . 9
5.6 Cleanability test . 10
5.6.1 General. 10
5.6.2 Test fabric . 10
5.6.3 Test media . 10
6 Severity . 10
6.1 Fingertip and hand abrasion test for cabin touch screens . 10
6.2 Fingerprint affinity test . 10
6.3 Scratch/mar tests. 10
6.4 General abrasion test . 10
6.5 Dirt affinity test . 10
6.6 Cleanability test . 11
7 Preconditioning . 11
8 Initial measurements . 11
9 Testing . 11
9.1 General. 11
9.2 Fingertip and hand abrasion test for cabin touch screens . 11
9.3 Fingerprint affinity test . 11
9.4 Scratch/mar tests . 11
9.5 General abrasion tests . 11
9.6 Dirt affinity test . 11
9.7 Cleanability test . 12
10 Intermediate measurements . 12
11 Recovery . 12
12 Damage documentation and analysis . 12
12.1 Visual evaluation . 12
12.2 Water drop angle test . 12
12.3 Documentation and topographical analysis on damaged area . 13
12.4 Fast abrasion evaluation with Micro-Calotest . 13
13 Relevant information to be given in the test report . 15
Annex A (informative) Schematic drawing of a test apparatus for generating the fingerprint . 17
Annex B (informative) Schematic drawing of a test apparatus for pencil abrasion test . 18
Annex C (informative) Additional textiles for testing . 19
Bibliography . 20

European foreword
This document (prEN 4876:2021) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
1 Scope
This document provides a series of testing methods to determine the resistance of the digital display
during general usage in an aircraft cabin. The document applies to any passive and interactive displays.
It includes also dirt affinity and cleanability.
The testing methods include the determination of the durability of touchscreen surfaces, signing pads
and general displays against human fingertip and hand abrasion, fingerprint and dirt affinity under the
usage by humans as can occur during everyday operation inside an aircraft cabin. Additionally, the
resistance against general abrasion, scratch and mar on the displays as well as the resistance study
against the routine cleaning procedure conducted inside the aircraft is defined.
The test methods are also suitable to test the durability of a display surface against all low and high
dynamic strains.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
prEN 4860, Aerospace series — Environmental testing — Test Xb: Abrasion of markings, letterings,
surfaces and materials caused by rubbing of fingertips and hands
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
4 General test description
4.1 General
The six tests scenarios for testing the durability of the displays in cabin interior are defined in 4.2 to 4.7.
4.2 Fingertips and hand abrasion test
The surface under test shall be repeatedly stressed by the impact and rubbing movement of a test
piston. The tip of the test piston due to its elasticity shall be deformed in such a way as to fit the surface
under test. The material, hardness, roughness and shape of the piston, the movement and the angle of
action shall be chosen in such a way that the pressure and friction executed by a human fingertip or by
the ball of a thumb are simulated.
To obtain reproducible conditions of friction and wear, a piece of fabric shall be placed between the
piston and the surface under test either as a cover of the piston or as a curtain, hanging between piston
and surface. The testing fabric, depending on its specified property, can contain additional ingredients
as a lubricant. Therefore, depending on the relevant specification, this fabric can either be used in a dry
condition (dry test and semi dry test) or additionally wetted with a specified test liquid by means of an

Published as ASD-STAN Standard at the date of publication of this document by AeroSpace and Defence
industries Association of Europe — Standardization (ASD-STAN), http://www.asd-stan.org/.
automatic feedthrough if the test is intended to cover the influence of fluid contamination as may occur
in normal use (wet test).
Depending on the three different motions of human fingertips on the display, namely touch, swipe and
zoom motions, the abrasion patterns are described in Figure 1, see [1].

Key
1 Impact on the sample surface = Putting on the fingertip when using display = short tap or touch motion
2 Friction path with defined force and speed/transition between static and sliding friction = Swipe movement
3 Reaching the end point of the friction movement; then the test cylinder moves back to the starting
position = Finger stops the swipe movement
4 Short area where the test piston moves bidirectionally on the surface = Retraction of the piston
Figure 1 — Fingertip abrasion zone and movement pattern
The complete test procedure for testing the resistance against fingertip and hand abrasion for cabin
touch screens shall be done according to prEN 4860. The complete test fabric options and test media
options are described in Annex C and in prEN 4860.
Additional speed options, differing from the 60 mm/s ± 5 mm/s specified in prEN 4860, such as
200 mm/s shall be used to simulate realistic stress conditions.
4.3 Fingerprint affinity
This test method serves as securing of a consistent implementation for the attachment of a fingerprint
on surfaces of displays.
The test medium shall be attached on the surface of a display surface fitting by the help of a silicon
stamp, using a reproducible amount and
...