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
Technical Committee
Current Stage
4060 - Closure of enquiry - Enquiry
Due Date
24-Jun-2021
Completion Date
24-Jun-2021

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SLOVENSKI STANDARD
oSIST prEN 4876:2021
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
oSIST prEN 4876:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 4876:2021
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oSIST prEN 4876:2021
DRAFT
EUROPEAN STANDARD
prEN 4876
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.
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oSIST prEN 4876:2021
prEN 4876:2021 (E)
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

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oSIST prEN 4876:2021
prEN 4876:2021 (E)

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

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oSIST prEN 4876:2021
prEN 4876:2021 (E)
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.
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oSIST prEN 4876:2021
prEN 4876:2021 (E)
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/.

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oSIST prEN 4876:2021
prEN 4876:2021 (E)

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
...

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