EN 2311:2017

SLOVENSKI STANDARD
01-junij-2017
1DGRPHãþD
SIST EN 2311:2012
$HURQDYWLND3XãHVVDPRPD]DOQRREORJR7HKQLþQDVSHFLILNDFLMD
Aerospace series - Bushes with self-lubricating liner - Technical specification
Luft- und Raumfahrt - Buchsen mit selbstschmierender Beschichtung - Technische
Lieferbedingungen
Série aérospatiale - Bagues avec garniture autolubrifiante - Spécification technique
Ta slovenski standard je istoveten z: EN 2311:2017
ICS:
49.030.99 Drugi vezni elementi Other fasteners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 2311
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2017
EUROPÄISCHE NORM
ICS 49.035 Supersedes EN 2311:2012
English Version
Aerospace series - Bushes with self-lubricating liner -
Technical specification
Série aérospatiale - Bagues avec garniture Luft- und Raumfahrt - Buchsen mit selbstschmierender
autolubrifiante - Spécification technique Beschichtung - Technische Lieferbedingungen
This European Standard was approved by CEN on 2 January 2017.

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, 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: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2311:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions. 5
4 Required characteristics, inspection and test methods . 7
5 Quality assurance . 11
6 Acceptance conditions . 12
7 Packaging . 12
8 Certificate of compliance . 13
(normative) Testing of permissible and ultimate static loads . 15
A.1 Permissible radial static loads (C ) . 15
s
A.2 Ultimate radial static loads . 15
A.3 Permissible axial static loads (C ) . 16
a
A.4 Ultimate axial static loads . 17
(normative) Testing of permissible radial dynamic loads (C ) . 19
B.1 Principle. 19
B.2 Method . 19
(normative) Fluids — Essential characteristics . 22
C.1 Fuel for turbine aero engine . 22
C.2 Fluids for de-icing circuit . 22
C.3 Hydraulic fluids . 22
C.4 De-icing and anti-icing fluids . 23
(normative) Resistance of the liner to peeling . 24
D.1 Principle. 24
D.2 Method . 24
(normative) Measurement of friction coefficient for EN 4534-2, EN 4535-2, EN 4536-2
and EN 4537-2 (for inch size only) . 25
E.1 Principle. 25
E.2 Starting torque under load C at room temperature . 25
(informative) Permissible unit pressure. 27
(informative) Standard evolution form . 28

European foreword
This document (EN 2311:2017) 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 Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
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 September 2017, and conflicting national standards shall be
withdrawn at the latest by September 2017.
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.
This document supersedes EN 2311:2012.
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.
1 Scope
This document specifies the required characteristics, inspections and tests, quality assurance and
qualification, acceptance and delivery conditions for bushes, designed to be subjected under load, to slow
sliding movements, rotations and small oscillations only for aerospace applications.
This standard applies to all bushes when referred to in the respective product standards or in a design
documentation.
The liner is designed to be used in the temperature range of −50 °C to 163 °C. Aluminium bushes are limited
to −55 °C to 121 °C.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 2285, Aerospace series — Bushes, plain, aluminium alloy, with self-lubricating liner — Dimensions and
loads
EN 2286, Aerospace series — Bushes, flanged aluminium alloy, with self-lubricating liner — Dimensions and
loads
EN 2287, Aerospace series — Bushes, plain corrosion resisting steel, with self-lubricating liner — Dimensions
and loads
EN 2288, Aerospace series — Bushes, flanged, corrosion resisting steel, with self-lubricating liner — Dimensions
and loads
EN 2755, Aerospace series — Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner —
Elevated loads at ambient temperature — Technical specification
EN 4534-2, Aerospace series — Bushes, plain in aluminium alloy with self-lubricating liner, elevated load —
Part 2: Dimensions and loads — Inch series
EN 4535-2, Aerospace series — Bushes, flanged in aluminium alloy with self-lubricating liner, elevated load —
Part 2: Dimensions and loads — Inch series
EN 4536-2, Aerospace series — Bushes, plain in corrosion resisting steel with self-lubricating liner, elevated
load — Part 2: Dimensions and loads — Inch series
EN 4537-2, Aerospace series — Bushes, flanged in corrosion-resisting steel with self-lubricating liner, elevated
load — Part 2: Dimensions and loads — Inch series
EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defense Organizations
EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard
parts
EN 10204, Metallic products — Types of inspection documents
EN ISO 8785, Geometrical Product Specification (GPS) — Surface imperfections — Terms, definitions and
parameters
ISO 11078, Aircraft — De-icing/anti-icing fluids — ISO type II, III and IV
TR 4475, Aerospace series — Bearings and mechanical transmissions for airframe applications —
1)
Vocabulary
3 Terms and definitions
For the purpose of this standard the terms and definitions given in TR 4475 and the following definitions
apply.
3.1
bush with self-lubricating liner
ring in corrosion resisting steel or aluminium alloy with a self-lubricating liner bonded to the bore
Note 1 to entry: With regards to flanged bushes the self-lubricating material is bonded to the outer face of the flange
as well as the bore.
3.2
loads
3.2.1
permissible static load C or permissible static axial load C (flanged bushes only)
S a
maximum permissible load (without safety factor), which can be applied statically
Note 1 to entry: It is defined as a unit pressure multiplied by the effective projected area (radial or axial) for
deformations that are compatible with correct operational behaviour.
3.2.2
ultimate static load (radial or axial)
1,5 times the value of the permissible static load
Note 1 to entry: It is defined as being the highest load the bush will support without failure occurring.
3.2.3
permissible dynamic radial load C
load that a bush can withstand, when subjected to an oscillating motion for 25 000 cycles at the rate of
(12 ± 2) cycles/min
3.2.4
cycle
angular displacement of the shaft in relation to the lined bush of 0° to −25°, then of −25° to +25° and finally
+25° to 0°, see Figure 1
Figure 1 — Cycle
1)
Published as ASD-STAN Technical Report at the date of publication of this standard. http://www.asd-stan.org/
3.3
friction torque under load at ambient temperature
coefficient of friction calculated as follows:
𝑇𝑇
𝜇𝜇  =
𝐶𝐶  ⋅ 𝑅𝑅
where
μ is the coefficient of friction;
T is the dynamic rotational torque under load, expressed in Newton meters (Nm);
R is the radius of shaft, expressed in metres (m);
C is the dynamic radial load, expressed in Newton (N).
3.4
surface discontinuities
3.4.1
crack
linear recession with a sharp bottom resulting from a disturbance of the integrity of the surface and of the
parent material of the workpiece
[SOURCE: EN ISO 8785, modified: figure not included]
3.4.2
scratch
score
surface imperfection which is a recession of irregular shape and unspecified direction
[SOURCE: EN ISO 8785, modified: synonym “score” added, figure not included]
3.4.3
lap
tongue-like raising of small thickness, often in the form of a seam, caused by folding over of material and
forcing it into the surface when rolling, forging etc.
[SOURCE: EN ISO 8785, figure not included]
3.4.4
seam
non-welded fold which appears as an open defect in the material
3.5
void
area where the adhesive bond is br
...