EN 4841-1:2022

Aerospace series - Shock mount with bushes - Part 1: Technical specification

This document specifies the required characteristics, inspection and test methods, qualification and acceptance conditions for shock mounts with bushes, designed to withstand static and dynamic loads possible for aerospace interior applications in the temperature range from -55 °C to 85 °C.

Luft- und Raumfahrt - Schwingungsdämpfer mit Buchse - Teil 1: Technische Lieferbedingung

Série aérospatiale - Amortisseur de vibrations à bagues - Partie 1 : Spécification technique

Le présent document spécifie les caractéristiques requises, les méthodes de contrôle et d'essai, les conditions de qualification et de réception des amortisseurs de vibrations à bagues, conçus pour résister aux charges statiques et dynamiques éventuelles des applications intérieures aérospatiales dans une plage de températures de −55 °C à 85 °C.

Aeronavtika - Dušilniki vibracij z oblogami - 1. del: Tehnična specifikacija

Ta evropski standard določa zahtevane lastnosti, metode nadzora in preskušanja ter pogoje kvalifikacije in sprejemljivosti za dušilnike vibracij z oblogami, ki so odporni na statične in dinamične obremenitve ter se lahko uporabljajo v notranji opremi za aeronavtiko v temperaturnem območju od –55 °C do 85 °C.

General Information

• Status: Published
• Publication Date: 30-Aug-2022
• Withdrawal Date: 29-Nov-2022
• ICS: 49.035 - Components for aerospace construction
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 1 - Parts of Mechanical Systems
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 25-May-2022
• Completion Date: 25-May-2022
• Ref Project: SIST EN 4841-1:2022 - Aerospace series - Shock mount with bushes - Part 1: Technical specification

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 4841-1:2022
01-julij-2022
Aeronavtika - Dušilniki vibracij z oblogami - 1. del: Tehnična specifikacija
Aerospace series - Shock mount with bushes - Part 1: Technical specification
Luft- und Raumfahrt - Schwingungsdämpfer mit Buchse - Teil 1: Technische
Lieferbedingung

Série aérospatiale - Amortisseur de vibrations avec douille - Partie 1 : Spécification

technique
Ta slovenski standard je istoveten z: EN 4841-1:2022
ICS:
49.035 Sestavni deli za letalsko in Components for aerospace
vesoljsko gradnjo construction
SIST EN 4841-1:2022 en,fr,de

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

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SIST EN 4841-1:2022
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SIST EN 4841-1:2022
EN 4841-1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 49.035
English Version
Aerospace series - Shock mount with bushes - Part 1:
Technical specification

Série aérospatiale - Amortisseur de vibrations à bagues Luft- und Raumfahrt - Schwingungsdämpfer mit

- Partie 1 : Spécification technique Buchse - Teil 1: Technische Lieferbedingung
This European Standard was approved by CEN on 12 July 2020.

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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4841-1:2022 E

worldwide for CEN national Members.
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SIST EN 4841-1:2022
EN 4841-1:2022 (E)
Contents Page

European foreword ............................................................................................................................................ 4

Introduction .......................................................................................................................................................... 5

1 Scope .......................................................................................................................................................... 6

2 Normative references .......................................................................................................................... 6

3 Terms and definitions ......................................................................................................................... 7

4 Symbols and abbreviations ............................................................................................................... 8

5 Required characteristics, inspections and test methods ....................................................... 8

6 Static loads .............................................................................................................................................. 9

6.1 Description of test procedure .......................................................................................................... 9

6.2 Load calculation .................................................................................................................................... 9

7 Fatigue loads ........................................................................................................................................... 9

8 Technical requirements ..................................................................................................................... 9

8.1 General...................................................................................................................................................... 9

8.2 Check of external surfaces ............................................................................................................... 10

8.2.1 Visual inspection ................................................................................................................................. 10

8.2.2 Roughness check ................................................................................................................................. 10

8.3 Dimensional check ............................................................................................................................. 10

8.3.1 Check of general shock mount design ......................................................................................... 10

8.3.2 Check of shock mount geometrical characteristics ................................................................ 10

8.4 Check of mass ....................................................................................................................................... 10

8.5 Stiffness .................................................................................................................................................. 10

8.6 Load test ................................................................................................................................................. 10

8.6.1 Check of limit load .............................................................................................................................. 10

8.6.2 Check of ultimate load ....................................................................................................................... 10

8.6.3 Load direction ...................................................................................................................................... 10

8.7 Corrosion test ....................................................................................................................................... 10

8.8 Fire worthiness requirements ....................................................................................................... 11

8.9 Environmental conditions ............................................................................................................... 11

8.9.1 Requirements ....................................................................................................................................... 11

8.9.2 Purpose of the test .............................................................................................................................. 11

8.9.3 Test procedure ..................................................................................................................................... 11

8.9.4 Conclusion ............................................................................................................................................. 11

8.10 Marking .................................................................................................................................................. 11

9 Qualification ......................................................................................................................................... 11

9.1 Approval of manufacturers ............................................................................................................. 11

9.2 Classification of inspection .............................................................................................................. 11

9.3 Qualification test ................................................................................................................................. 11

9.4 First article inspection ...................................................................................................................... 12

9.5 Conformance/Acceptance test ....................................................................................................... 12

10 Condition on delivery ........................................................................................................................ 12

10.1 Packaging ............................................................................................................................................... 12

10.2 Marking of packages .......................................................................................................................... 12

10.3 Unit and transport packages ........................................................................................................... 12

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11 Material .................................................................................................................................................. 12

11.1 Requirement ......................................................................................................................................... 12

11.2 Inspections and test method .......................................................................................................... 13

Annex A (normative) Sampling ................................................................................................................... 18

A.1 Acceptance test samples .................................................................................................................. 18

A.2 Qualification test samples ............................................................................................................... 18

Bibliography ....................................................................................................................................................... 20

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SIST EN 4841-1:2022
EN 4841-1:2022 (E)
European foreword

This document (EN 4841-1:2022) 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 European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by November 2022, and conflicting national standards shall

be withdrawn at the latest by November 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

the United Kingdom.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.
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SIST EN 4841-1:2022
EN 4841-1:2022 (E)
Introduction

This document is part of the series of EN mechanical standards for aerospace applications.

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SIST EN 4841-1:2022
EN 4841-1:2022 (E)
1 Scope

This document specifies the required characteristics, inspection and test methods, qualification and

acceptance conditions for shock mounts with bushes, designed to withstand static and dynamic loads

possible for aerospace interior applications in the temperature range from −55 °C to 85 °C.

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.

EN 2424:2008, Aerospace series — Marking of aerospace products

EN 2825, Aerospace series — Burning behaviour of non metallic materials under the influence of radiating

heat and flames — Determination of smoke density

EN 2826, Aerospace series — Burning behaviour of non metallic materials under the influence of radiating

heat and flames — Determination of gas components in the smoke
EN 3844 (all parts), Aerospace series — Flammability of non-metallic materials
EN 4662, Aerospace series — Test specification for vibration control components

EN 4841-2, Aerospace series — Shock mounts with bushes — Part 2: Technical overview

EN 10204, Metallic products — Types of inspection documents

EN ISO 75-2, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and

ebonite (ISO 75-2)

EN ISO 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals

(ISO 175)
EN ISO 178, Plastics — Determination of flexural properties (ISO 178)

EN ISO 179-1:2010, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented

impact test (ISO 179-1:2010)

EN ISO 291, Plastics — Standard atmospheres for conditioning and testing (ISO 291)

EN ISO 527-2:2012, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding

and extrusion plastics (ISO 527-2:2012)

EN ISO 1172, Textile-glass-reinforced plastics — Prepregs, moulding compounds and laminates —

Determination of the textile-glass and mineral-filler content; calcination methods (ISO 1172)

EN ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1:

Immersion method, liquid pycnometer method and titration method (ISO 1183-1)

EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227)

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EN 4841-1:2022 (E)

DIN 53504:2017, Testing of rubber — Determination of tensile strength at break, tensile stress at yield,

elongation at break and stress values in a tensile test

DIN 65271, Aerospace series — Elastomeric semi-finished products and parts — Technical specification

ISO 34-1:2015, Rubber, vulcanized or thermoplastic — Determination of tear strength — Part 1: Trouser,

angle and crescent test pieces

ISO 37:2017, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties

ISO 48-4, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 4: Indentation

hardness by durometer method (Shore hardness)

ISO 1817:2015, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids

ISO 2781:2018, Rubber, vulcanized or thermoplastic — Determination of density
FAR/JAR/CS 25.853:1999, Compartment interiors

RTCA DO-160G:2010, Environmental Conditions and Test Procedures for Airborne Equipment

UL 746B, Standard for Safety for Polymeric Materials — Long Term Property Evaluations

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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 https://www.electropedia.org/
3.1
standard part

complete shock mount assembly, which consists of inner and outer metal rings with vulcanized rubber

and spherical bearing
3.2
Batch definition
3.2.1
manufacturing batch

batch composed of inner and outer rings made of same material (same material batch), with same

dimensions and belonging to the same manufacturing campaign and vulcanized with the same rubber

compound
Published by: Beuth Verlag GmbH. www.beuth.de

Published by: European Aviation Safety Agency, Postfach 10 12 53, D-50452 Koeln, Germany.

Published by: Radio Technical Commission for Aeronautics (RTCA), 1140 Connecticut Ave., N.W. Suite 1020,

Washington, D.C. 20036, USA.
Published as UL Standard, https://ulstandards.ul.com/.
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EN 4841-1:2022 (E)
3.2.2
artificial batch

batch which consists of different manufacturing batches and is limited to a maximum of 100 shock

mounts
3.3
qualification test

test or series of tests to demonstrate that the products comply with the requirements stipulated in this

document and/or in a product standard and are accomplished according to documented parameters and

under reproducible conditions
3.4
acceptance test

test that demonstrates the characteristics of manufactured products comply with the requirements

4 Symbols and abbreviations
R roughness value
s ultimate/limit load factor
s fitting factor
QTP Qualification Test Plan
QTR Qualification Test Report
5 Required characteristics, inspections and test methods
Inspection and test methods shall be done according to Table 1.
Table 1 — Inspect
...