SIST EN 4691-1:2017

Aerospace series - Tie rod with integrated bolts - Part 1: Technical specification

This standard specifies the required characteristics, inspection and test methods, qualification and
acceptance conditions for rod assemblies with two adjustable ends with integrated bolts, designed to
withstand static and dynamic loads possible for interior and substructure in the temperature range
from − 55 °C to 85 °C. It is applicable whenever referenced.
For a complete overview see EN 4691-2.

Luft- und Raumfahrt - Zug-Druck-Stange mit integrierten Bolzen - Teil 1: Technische Lieferbedingung

Série aérospatiale - Bielle avec axes intégrés - Partie 1 : Spécification technique

Aeronavtika - Zglobna ročica z vgrajenim sornikom - 1. del: Tehnična specifikacija

Ta standard določa zahtevane lastnosti, preglede in preskusne metode, kvalifikacije ter pogoje sprejemljivosti za sestave ročic z dvema nastavljivima končnikoma z vgrajenimi sorniki, ki so odporne na statične in dinamične obremenitve ter se lahko uporabljajo v notranjosti ali podstrukturah v temperaturnem razponu od –55 °C do 85 °C. Uporablja se, kadar je naveden.
Za celoten pregled glej standard EN 4691-2.

General Information

• Status: Published
• Public Enquiry End Date: 19-May-2016
• Publication Date: 06-Nov-2017
• ICS: 49.035 - Components for aerospace construction
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Oct-2017
• Due Date: 24-Dec-2017
• Completion Date: 07-Nov-2017
• Ref Project: EN 4691-1:2017 - Aerospace series - Tie rod with integrated bolts - Part 1: Technical specification

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 4691-1:2017
01-december-2017
$HURQDYWLND=JOREQDURþLFD]YJUDMHQLPVRUQLNRPGHO7HKQLþQDVSHFLILNDFLMD
Aerospace series - Tie rod with integrated bolts - Part 1: Technical specification
Luft- und Raumfahrt - Zug-Druck-Stange mit integrierten Bolzen - Teil 1: Technische
Lieferbedingung
Série aérospatiale - Bielle avec axes intégrés - Partie 1 : Spécification technique
Ta slovenski standard je istoveten z: EN 4691-1:2017
ICS:
49.035 Sestavni deli za letalsko in Components for aerospace
vesoljsko gradnjo construction
SIST EN 4691-1:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 4691-1:2017

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SIST EN 4691-1:2017


EN 4691-1
EUROPEAN STANDARD

NORME EUROPÉENNE

October 2017
EUROPÄISCHE NORM
ICS 49.035
English Version

Aerospace series - Tie rod with integrated bolts - Part 1:
Technical specification
Série aérospatiale - Bielle avec axes intégrés - Partie 1 : Luft- und Raumfahrt - Zug-Druck-Stange mit
Spécification technique integrierten Bolzen - Teil 1: Technische
Lieferbedingungen
This European Standard was approved by CEN on 25 June 2016.

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 4691-1:2017 E
worldwide for CEN national Members.

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 7
4 Symbols and abbreviations . 8
5 Required characteristics, inspections and test methods . 9
6 Allowable static loads . 10
7 Allowable dynamic loads . 17
8 Assembly load locking clip EN 4692 . 22
9 Adjustment-torque . 23
10 Technical requirements. 24
11 Qualification . 30
12 Condition on delivery . 31
13 Material . 31
Annex A (normative) Sampling . 37
A.1 Acceptance test samples . 37
A.2 Qualification test samples . 38
Annex B (informative) Standard evolution form . 54


2

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
European foreword
This document (EN 4691-1:2017) 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 April 2018, and conflicting national standards shall be
withdrawn at the latest by April 2018.
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.
3

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
Introduction
Aerospace and Defence Standardization (ASD-STAN) draws attention to the fact that it is claimed that
compliance with this document may involve the use of a patent.
USA: US 8371767
China: CN 10104431
Japan: JP 4885140
Russia: RU 2389914
South Africa: ZA 2007/03913
Canada: 2584387
South Korea: 7011559
ASD-STAN takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured ASD-STAN that he/she is willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this
respect, the statement of the holder of this patent right is registered with ASD-STAN. Information may
be obtained from:
GMT Gummi-Metall-Technik GmbH
Liechtersmatten 5
D-77815 Bühl
TRIGUM Engineering GmbH
Brunskamp 4
D-21220 Seevetal/Maschen
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights other than those identified above. ASD-STAN shall not be held responsible for identifying
any or all such patent rights.
4

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
1 Scope
This standard specifies the required characteristics, inspection and test methods, qualification and
acceptance conditions for rod assemblies with two adjustable ends with integrated bolts, designed to
withstand static and dynamic loads possible for interior and substructure in the temperature range
from − 55 °C to 85 °C. It is applicable whenever referenced.
For a complete overview see EN 4691-2.
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.
DIN 53504, 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
EN 571-1, Non-destructive testing — Penetrant testing — Part 1: General principles
EN 2004-1, Aerospace series — Test methods for aluminium and aluminium alloy products —
Part 1: Determination of electrical conductivity of wrought aluminium alloys
EN 2424, 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 4691-2, Aerospace series — Tie rod with integrated bolts — Part 2: Overview construction kit
EN 4692, Aerospace series — Tie rod with integrated bolts — Locking clip
EN 4693, Aerospace series — Tie rod with integrated bolts — Assembly Code A, B and C
EN 4694, Aerospace series — Tie rod with integrated bolts — Assembly Code D, E and F
EN 4695, Aerospace series — Tie rod with integrated bolts — Assembly Code G, H and K
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 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)
5

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
EN ISO 178, Plastics — Determination of flexural properties (ISO 178
EN ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact
test (ISO 179-1)
EN ISO 291, Plastics — Standard atmospheres for conditioning and testing (ISO 291)
EN ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and
extrusion plastics (ISO 527-2)
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 pyknometer method and titration method (ISO 1183-1)
EN ISO 9001, Quality management systems — Requirements (ISO 9001)
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227)
ISO 34-1, Rubber, vulcanized or thermoplastic — Determination of tear strength — Part 1: Trouser, angle
and crescent test pieces
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 2781, Rubber, vulcanized or thermoplastic — Determination of density
ISO 5855-1, Aerospace — MJ threads — Part 1: General requirements
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
ISO 10123, Adhesives — Determination of shear strength of anaerobic adhesives using pin-and-collar
specimens
ISO 10964, Adhesives — Determination of torque strength of anaerobic adhesives on threaded fasteners
1)
ASTM E112, Standard Test Methods for Determining Average Grain Size
ASTM C177, Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission
2)
Properties by Means of the Guarded-Hot-Plate Apparatus
ASTM D696, Standard Test Method for Coefficient of Linear Thermal Expansion of Plastics Between –30 °C
2)
and 30 °C with a Vitreous Silica Dilatometer
2)
FAR/JAR/CS 25.853, Compartment Interiors

1)
Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken,
PA 19428-2959, USA. http://www.astm.org/
2)
Published by: European Aviation Safety Agency, Postfach 101253, D-50452 Koeln, Germany.
6

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
3)
RTCA-DO 160E, Environmental Conditions and Test Procedures for Airborne Equipment
UL 746B version 1.3 date 29.11.2000, Plastics — Polymeric Materials — Long Term Property
4)
Evaluations
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
standard part
completed rod assembly, which consists of a rod body, two end fittings (adjustable) and their associated
locking or blocking system
3.2
assembly
— See EN 4693;
— See EN 4694;
— See EN 4695.
3.3
traceability
ability to trace the history, application or location of an entity by means of recorded identifications
Note 1 to entry: Traceability of raw materials and manufacturing processes of each individual component of
every tie rod refers to EN 9100. Every tie rod is marked for traceability with a serial number.
3.4
Batch definition
3.4.1
manufacturing batch
composed of rod bodies made of same material (same material batch), with same diameter and same
thickness and belonging to the same manufacturing campaign and equipped with rod body ends and
rods ends of same design
3.4.2
artificial batch
consists of different manufacturing batches and are limited to a maximum of 100 rods
3.5
qualification test
is a test or series of tests to demonstrate that the products comply with the requirements stipulated in
this specification and/or in a product standard and are accomplished according to documented
parameters and under reproducible conditions
3.6
acceptance test
demonstrates that the characteristics of manufactured products comply with the requirements

3)
Published by: Radio Technical Commission for Aeronautics (RTCA), 1140 Connecticut Ave., N.W. Suite 1020,
Washington, D.C. 20036, USA.
4)
Published as UL Standard, http://ulstandardsinfonet.ul.com.
7

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
4 Symbols and abbreviations
L = tie rod length Pin to Pin [mm]
1
a = amplitude
D = outer diameter rod body
d = transformed diameter rod body
D = total damage
a
D = partial damage
ai
R = border stress rate
n = lifetime
R = roughness
a
s = factor ultimate, limit load
1
s = fitting factor
2
QTP = Qualification Test Plan
QTR = Qualification Test Report
F = compression Load [N]
c
F = load amplitude [N]
a
L = load cycle
c
8

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
5 Required characteristics, inspections and test methods
See Table 1.
Table 1 — Inspections and test methods
b
Inspection
A
a
Clause Characteristic Requirement Q
and test method
In accordance with Clause 7
See 7.2.
in this specification or design
7 Allowable dynamic loads Wöhler curve and X –
documentation at 85 °C
Miner’s rule
temperature
In accordance with Table 3 See Clause 8.
Assembly load locking
8 in this specification or design Assembly load locking X X
clip
documentation clip EN 4692
In accordance with Table 4
See Clause 9.
9 Adjustment-torque in this specification or design X X
Adjustment-torque
documentation
Check of heat treatment
According to
/ condition for See EN 2004-1. X X
EN 2004-1
Aluminium alloy
In accordance with 10.2
Check of external See 10.2.1, 10.2.2
10.2 in this specification or design X X
surfaces and 10.2.3.
documentation
In accordance with 10.3
10.3 Cross sectional check in this specification or design See 10.3.2 and 10.3.3. X X
documentation
In accordance with the product
See 10.4.1, 10.4.2
X
10.4 Dimensional check standard or design X
and 10.4.3.
documentation
In accordance with 10.5
Static load test of rod
10.5 in this specification or design See 10.5.1 and 10.5.2. X X
assembly
documentation
In accordance with the product
10.6 Check of mass standard or design Suitable methods X X
documentation
In accordance with the product
10.7 Check of paint thickness standard or design Suitable methods X X
documentation
In accordance 10.8
in this specification or design See 10.8.1, 10.8.2
10.8 Tensile test X –
documentation at 85 °C and 10.8.3.
temperature
In accordance with 10.9
in this specification or design See 10.9.1
10.9 Compression tests X –
documentation at 85 °C and 10.9.2.
temperature
In accordance with 10.9.3
Check of buckling
10.9.3 in this specification or design See 10.9.3. X –
strength
documentation
In accordance with 10.10
Break away torque test
10.10 in this specification or design See 10.10. X X
plastic insert
documentation
10.11 Corrosion test See EN ISO 9227. X –
According EN ISO 9227 spray
9

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
b
Inspection
A
a
Clause Characteristic Requirement Q
and test method
time 192 h
Fire worthiness
10.12 According FAR/JAR/CS 25.853 See FAR/JAR/CS 25.853. X –
requirements
Environmental RTCA-DO160E Section 11
10.13 See 10.13.2 and 10.13.3. X –
conditions Category F
10.14 Marking According EN 2424 style A Visual examination X X
13 Material See 13.1. See 13.2. X X
a
Q: Qualification test.
b
A: Acceptance test (per delivery batch).
Sample plan for qualification and series production see Annex A.
6 Allowable static loads
All values are measured at a temperature of 85 °C.
Factor of safety between ultimate and limit load s = 1,5.
1
Factor for manufacturing and material tolerances s = 1,1.
2
6.1 Load calculation
For ultimate and limit load calculation, see Equation (1) and Equation (2).
Ultimate load = verified measured values / s (1)
2
Limit load = ultimate load / s (2)
1
6.2 Static tension loads
For tension loads, see Table 2.
10

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
Table 2 — Tension loads
EN Assembly Material Pin Size Limit Ultimate Limit and ultimate
Standard code code diameter code tension tension compression
   Load Load Load
0

−0,013
  mm kN kN
01
02
03
04
07
09
21
6,35
22
23
24
27
29
See Figure 1
EN 4693 A, B, C A, B 13,3 20
and Figure 2.
41
05
06
10
25
7,938
26
30
42
43
08
9,525 28
44
01
02
03
04
07
09
EN 4694 D, E, F A 6,35 21 13,3 20 See Figure 3.
22
23
24
27
29
41
05
EN 4694 D, E, F A 7,938 13,3 20 See Figure 3.
06
11

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
EN Assembly Material Pin Size Limit Ultimate Limit and ultimate
Standard code code diameter code tension tension compression
   Load Load Load
0

−0,013
  mm kN kN
10
25
26
30
42
43
08
9,525 28
44
01
02
03
04
07
09
6,35 21 24 36
22
23
24
27
29
EN 4694 D, E, F B See Figure 4.
41
05
06
10
25
7,938
26
30
26,7 40
42
43
08
9,525 28
44
50
51
6,35
60
EN 4695 G, H, K C 61 13,3 20 See Figure 5.
70
52
7,938
62

12

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
6.3 Static compression loads
For compression loads assembly code A, B, C, see Figure 1 and Figure 2.
For compression loads (F ) calculation, see Equation (3), Equation (4), Equation (5) and Equation (6).
c

Key
1 Curve ultimate load
2 Curve limit load
Figure 1 — Compression load assembly code A, B, C with material code A
For rod lengths smaller than 510 mm the load limitation is given by the thread of fork end, eye end in
aluminium at ultimate load 12 kN and limit load 8 kN.
13

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)

Key
1 Curve ultimate load
2 Curve limit load
Figure 2 — Compression load assembly code A, B, C with material code B
For rod lengths smaller than 315 mm the load limitation is given by mechanical strength of the rod body
at ultimate load 18 kN and limit load 12 kN.
14

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
For compression loads assembly code D, E, F, see Figure 3 and Figure 4.
For compression loads (F ) calculation, see Equation (7), Equation (8), Equation (9) and Equation (10).
c

Key
1 Curve ultimate load
2 Curve limit load
Figure 3 — Compression load assembly code D, E, F with material code A
For rod lengths smaller than 840 mm the load limitation is given by the thread of fork end, eye end in
aluminium at ultimate load 12 kN and limit load 8 kN.
15

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)

Key
1 Curve ultimate load
2 Curve limit load
Figure 4 — Compression load assembly code D, E, F with material code B
For rod lengths smaller than 660 mm the load limitation is given by the thread of fork end, eye end in
stainless steel at ultimate load 20 kN and limit load 13,3 kN.
16

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
For compression loads assembly code G, H, K, see Figure 5.

Key
1 Curve ultimate load
2 Curve limit load
Figure 5 — Compression load assembly code G, H, K with material code C
For all rod lengths the load limitation is given by mechanical strength of the rod body at ultimate load
18 kN and limit load 12 kN.
7 Allowable dynamic loads
7.1 Description of Test procedure
For the lifetime prediction of the tie rods so called part related Wöhler curves shall be generated. The
Wöhler curves shall be generated with a one-axis hydraulic test bench. All tests shall be executed with
alternating tension, compression load and load controlled sinus signal.
During the Wöhler-Test the loads where choose to minimize the effort to obtain the decisive results. To
define the 90 % and 95 %-Wöhler curve a constant linear gradient has been assumed. The curve was
displaced in a way that all single test results were above the curve.
For the damage calculation the elementary Miner-Rule shall be applied. The main predication is that the
partial damage caused by single load cycles can be added up over all given load cycles. Damage equal or
higher than one indicates failure of the component.
17

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EN 4691-1:2017 (E)
7.2 Wöhler curve and Miner’s rule
For example of Wöhler curve, see Figure 6.
Experience: A load cycle of amplitude a can be repeated n-times until failure.
Logarithmic space: Linear relation between amplitude of a load cycle and corresponding lifetime.

Figure 6 — Fatigue strength is given by a Wöhler curve (S-n curve)
Every load cycle causes a partial damage (Palmgren / Miner). Partial damage (D ) of single load cycle is
a
the reciprocal value of lifetime (n), see Figure 7.

1
𝐷𝐷     =
a
𝑛𝑛


Figure 7 — Equation "Partial damage"
Total damage (D ) of a load signal results from accumulation of partial damages (D ) (Miner's rule).
a ai
Damage equal to one indicates failure, see Figure 8.
    =   ∑𝐷𝐷 and 𝐷𝐷     =    1 → Failure
𝐷𝐷
a ai a
Figure 8 — Equation “Partial damage”
18

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
7.3 Part related Wöhler curve
All values are measured at a temperature of 85 °C.
For load amplitude Y (F ) and cycles X (L ) calculation, see Equation (11) and Equation (12) in Figure 9.
a c
Assembly code A, B, C Rod end Fork end
Rod body AL Ø 20,0 mm Material code A, B Material code A, B

Key
1 Reliability 90 %
2 Reliability 95 %
Wöhler curve for alternating loads tension and compression R = − 1 probability 95 %.
Figure 9 — Part related Wöhler curves
19

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
For load amplitude Y (F ) and cycles X (L ) calculation, see Equation (13) and Equation (14) in
a c
Figure 10.
Assembly code D, E, F Rod end Fork end
Rod body AL Ø 25,4 mm Material code A Material code A

Key
1 Reliability 90 %
2 Reliability 95 %
Wöhler curve for alternating loads tension and compression R = − 1 probability 95 %.
Figure 10 — Part related Wöhler curves
20

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
For load amplitude Y (F ) and cycles X (L ) calculation, see Equation (15) and Equation (16) in
a c
Figure 11.
Assembly code D, E, F Rod end Fork end
Rod body AL Ø 25,4 mm Material code B Material code B

Key
1 Reliability 90 %
2 Reliability 95 %
Wöhler curve for alternating loads tension and compression R = − 1 probability 95 %.
Figure 11 — Part related Wöhler curves
21

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
For load amplitude Y (F ) and cycles X (L ) calculation, see Equation (17) and Equation (18) in
a c
Figure 12.
Assembly code G, H, K Rod end Fork end
Rod body AL Ø 20,0 mm Material code C Material code C

Key
1 Reliability 90 %
2 Reliability 95 %
Wöhler curve for alternating loads tension and compression R = − 1 probability 95 %.
Figure 12 — Part related Wöhler curves
8 Assembly load locking clip EN 4692
8.1 Requirements
The locking clip has to be assembled and disassembled during installation of the tie rod in the aircraft.
Therefore the clip has to be pressed over the tooth system of the insert without exceeding the specified
forces.
22

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
8.2 Assembly load
The tolerances for assembly and disassembly has been specified, see Table 3. Force values have to be
documented after 1, 30, 60, 90 cycles:
Table 3 — Assembly load
Force Number of cycles
N
±50
Assembly load for clip
150 1 to 90
over tooth system
Disassembly load for clip
250 90
over tooth system
All tests should be performed at ambient temperature.
9 Adjustment-torque
9.1 Requirements
Due to the construction of the tie rods no counter nuts can be used. Consequently the threads of the fork
and rod ends have an axial play. With a special geometry of the threads (male thread M10 × 1,25 female
thread M10 × 1,255) the axial play of the threads has to be eliminated. For EN 4695, the elimination of
the axial play of the threads will be done by thread inserts with screw lock. The torque for turning the
threads including locking clip has to be in accordance with the following values, see Table 4.
9.2 Torque of thread
See Table 4.
Table 4 — Torque of thread
Torque Number of cycles
Torque of thread
Nm
a
Max. Any cycle
1,0
a
Min. After 15
0,2
a
For EN 4695 the threads shall be lubricated.

One cycle equates a length adjustment of the thread of ±6,4 mm for EN 4693 and EN 4694.
For EN 4695, the length adjustment of the thread is ±3,2 mm.
23

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SIST EN 4691-1:2017
EN 4691-1:2017 (E)
10 Technical requirements
10.1 General
Unless required otherwise on the product standard or specification drawing, the characteristics of the
rod shall be in compliance with the requirements of this specification.
10.2 Check of external surfaces
10.2.1 Visual inspection
Visually inspect the rod body before surface treatment with a magnification of ×10. No folds, cracks,
burrs, inclusions or tool marks or dents are allowed on the external surface of the rod body.
10.2.2 Roughness check
Unless specified otherwise on the drawing, the roughness value to be observed for the external surface
before surface treatment is R = 3,2 max.
a
10.2.3 Dye-penetrant inspection
The external surfaces shall be checked for absence of cracks and linear defects after heat treatment and
before surface treatment by dye penetrant inspection preceded by pickling in accordance with EN 571-
1. No cracks and no linear defects are tolerated.
10.3 Cross sectional check
10.3.1 General
The following shall be made: three sections perpendicular to the rod body axis on one end in the areas
shown on Figure 13.

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Zug-Druck-Stange mit integrierten Bolzen - Teil 1: Technische LieferbedingungSérie aérospatiale - Bielle avec axes intégrés - Partie 1 : Spécification techniqueAerospace series - Tie rod with integrated bolts - Part 1: Technical specification49.035Sestavni deli za letalsko in vesoljsko gradnjoComponents for aerospace constructionICS:Ta slovenski standard je istoveten z:FprEN 4691-1kSIST FprEN 4691-1:2016en,fr,de01-maj-2016kSIST FprEN 4691-1:2016SLOVENSKI
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