kSIST FprEN 4733-001:2024

SLOVENSKI STANDARD
oSIST prEN 4733-001:2024
01-maj-2024
Aeronavtika - Pravokotni optični konektor, modularni - Delovna temperatura 125
°C, za EN 4734 10X: MT kontakti - 001. del: Tehnična specifikacija
Aerospace series - Rectangular optical connector, modular - Operating temperature 125
°C, for EN 4734 10X: MT contacts - Part 001: Technical specification
Luft- und Raumfahrt - Optischer Rechtecksteckverbinder in modularer Bauweise,
Betriebstemperatur 125 °C, für EN XXXX-10x-MT-Kontakte - Teil 001: Technische
Lieferbedingungen
Série aérospatiale - Connecteur optique rectangulaire, modulaire - Température
d'utilisation 125 °C, pour EN 4734-10X : contacts MT - Partie 001 : Spécification
technique
Ta slovenski standard je istoveten z: prEN 4733-001
ICS:
49.090 Oprema in instrumenti v On-board equipment and
zračnih in vesoljskih plovilih instruments
oSIST prEN 4733-001:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 4733-001:2024
oSIST prEN 4733-001:2024
DRAFT
EUROPEAN STANDARD
prEN 4733-001
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2023
ICS 49.090
English Version
Aerospace series - Rectangular optical connector, modular
- Operating temperature 125 °C, for EN 4734 10X: MT
contacts - Part 001: Technical specification
Luft- und Raumfahrt - Optischer
Rechtecksteckverbinder in modularer Bauweise,
Betriebstemperatur 125 °C, für EN XXXX-10x-MT-
Kontakte - Teil 001: Technische Lieferbedingungen
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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4733-001:2023 E
worldwide for CEN national Members.

oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Contents Page
European foreword . 3
Introduction . 4
4.1 General. 6
4.2 Receptacle. 6
4.3 Plug . 6
4.4 Module . 6
4.5 Materials and surface treatment . 6
5.1 Housing . 7
5.2 Modules . 7
5.3 Optical MT contact . 7
5.4 Connector mating sequence . 7
5.5 Incorrect mating . 14
5.6 MT contact mating and unmating sequence in module . 15
6.1 General. 16
6.2 Receptacle. 16
6.3 Plug . 16
6.4 Modules . 16
6.5 Mating dimensions . 19
7.1 Tests according to EN 2591-100 . 22
7.2 Special tests . 26
8.1 General. 27
8.2 Qualification . 27
8.3 Maintenance of qualification . 33
9.1 Connectors (receptacle or plug) . 34
9.2 Modules . 34
9.3 Optical contact . 34

oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
European foreword
This document (prEN 4733-001:2023) 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.
oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Introduction
This family of fibre optic modules has the same mechanical interface than the one described in
EN 4165-001. The module defined in the prEN 4733-003 for two MT optical contacts defined in the
EN 4734-10X series can be fitted in either a plug or a receptacle EN 4165-001-compliant.
It is suitable for use on aerospace on board applications. It provides easy access for optical contact end
face cleaning.
oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
1 Scope
This document specifies the general characteristics, the condition for qualification, acceptance and
quality assurance, as well as the test programs and groups for EN 4165 rectangular connector with
removable module and two EN 4734 MT contacts.
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 2591 (all parts), Aerospace series — Elements of electrical and optical connection — Test methods
EN 3909, Aerospace series — Test fluids and test methods for electrical and optical components and sub-
assemblies
EN 4165 (all parts), Aerospace series — Connectors, electrical, rectangular, modular — Operating
temperature 175 °C continuous
prEN 4733-002, Aerospace series — Rectangular optical connector — Operating temperature 125 °C, for
EN 4734-10X: MT contacts — Part 002: Performance specification
prEN 4733-003, Aerospace series — Rectangular optical connector, modular — Operating temperature
125 °C, for EN 4734-10X: MT contacts — Part 003: Module double MT contacts, series 2 — product
standard
EN 4734-101, Aerospace series — Optical fibre contact multi connectors — Part 101: MT male contact
12 ways — Technical specification
EN 4734-102, Aerospace series — Optical fibre contact Multi connectors — Part 102: MT female contact
12 ways — Technical specification
EN 9133, Aerospace series — Quality Management Systems — Qualification Procedure for Aerospace
Standard Products
TR 4684, Aerospace series — Electrical and optical technology and component definitions
CEI-IEC 61754-5, International standard — Fibre optic connector interfaces — Part 5: Type MT connector
family
3 Terms and definitions
For the purposes of this document, the terms and definitions given in TR 4684 apply.
ISO and IEC maintain terminology 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/

In preparation at the date of publication of this document.
Published as ASD-STAN Technical Report at the date of publication of this document by AeroSpace and Defence
industries Association of Europe — Standardization (ASD-STAN), https://www.asd-stan.org/.
oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
4 Description
4.1 General
This document describes an optical connector module to be installed in either a plug or receptacle
shells conform to EN 4165-001.
The module uses rear removable optical contacts fitted with a MT ferrule compliant with CEI-
IEC 61754-5 as defined in EN 4734.
The precise alignment of the MT contained inside the optical contacts is accomplished by two alignment
pins and is secured by the use of a latching spring.
The male MT contact contains alignments pins recessed in the contact body. The female MT contact
does not contain alignment pins and its body does not cover the MT.
The module is mechanically held inside the connector shell cavity as defined in EN 4165-001.
Connector type designation as specified in EN 4165-001.
Standard EN 4165 back shell and cable clamp for rectangular connector are not compatible when
module equipped with two optical MT contact is mounted in connector.
The module is not waterproof. When only one MT optical contact is equipped in the module, a shutter
can be used in the empty cavity to protect the cavity against dust (in EN 4733-004 TBC).
4.2 Receptacle
Receptacle description as specified in EN 4165-001, series 2.
4.3 Plug
Plug description as specified in EN 4165-001 series,2.
4.4 Module
Mechanical interface and polarization between connector housings and module conform to
EN 4165-001 series 2 and EN 4165-003.
Module shall be single-bloc type design completed with an integrated MT contact retention system.
The design shall permit individual installation of the contacts without removal of the module from the
connector.
The module shall be permanently fitted with a peripheral gasket.
Male module is exclusively fitted with male MT contact, and conversely, female module is exclusively
fitted with female MT contact as specified in EN 4734-10X.
Male or female module shall contain two MT contacts cavities each.
4.5 Materials and surface treatment
4.5.1 General
The requirements of EN 4165-001 shall be applied.
4.5.2 Housings
The connector shell description is specified in EN 4165-001 series 2.
oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
4.5.3 Optical MT contacts
Optical MT contacts shall be made of suitable materials as specified in the product standard
EN 4734-10X.
4.5.4 Metallic or non-metallic materials
Materials used for modules, contacts and seals shall have a hardness and mechanical characteristics
consistent with the required use.
5 Design
5.1 Housing
The connector housing design is specified in EN 4165-001 series 2.
5.2 Modules
Modules carrying optical contacts shall be in hard material and have a cross section and radii such that
no cracks, flaking or breaks can occur in normal operation.
The module shall be single-bloc type design complete with contact retention systems and appropriate
seals.
The module is mechanically held in the connector housing by retention clips, and removable with the
use of an extraction tool.
The MT contacts retention system shall be integrated in the hard module.
Modules shall permanently contain a peripheral seal.
The design shall permit individual installation of the MT contacts without remove of the module from
the connector shell. The installation and the removal of the MT contact shall be by the rear of the
module.
The module is fitted by two mechanically polarized cavities for optical MT contact.
5.3 Optical MT contact
Optical MT contacts are spring loaded. The spring force is specified in the product standard
EN 4734-10X.
The spring is necessary to ensure a good compression between the two MT ferrules during connector
mating. By compressing, the spring allows the MT ferrule to move backwards in the MT contact body.
5.4 Connector mating sequence
5.4.1 General
This connector mating sequence is based on the one described in EN 4165-001
5.4.2 Centre coupling mechanism
The connector mating sequence shall be:
— connector face to face positioning, see Figure 1;
— connector keyways polarization guide, see Figure 2;
— plug – receptacle shell alignment, see Figure 3;
oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
— central thread coupling, see Figure 3;
— optical MT contact alignment, see Figure 4;
— alignment pins engagement into alignment hole – MT alignment, see Figure 5;
— MT physical contact, see Figure 6;
— optical contact latching spring compression, see Figure 7;
— interfacial seal compression, see Figure 7;
— metal or composite shell to shell bottoming, see Figure 7.

Figure 1 — Face-to-face positioning

Figure 2 — Keyways polarization guide
oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Figure 3 — Shell alignment (receptacle with plug) and central thread coupling

Figure 4 — Optical MT contact alignment (male with female)

oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Detail A
Figure 5 — Alignment pins engagement into alignment hole

Detail B
Figure 6 — MT physical contact

oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Detail C Detail D
NOTE L1 < L:
Key
L is the value when the two ferrules are in contact.
L1 is the value when the two ferrules are in compression.
Detail C: interfacial seal compression.
Detail D: connector locking mechanism alignment.
Figure 7 — Optical contact latching spring, interfacial seal compression and shell to shell
bottoming
5.4.3 Push-pull latching mechanism
The connector mating sequence shall be:
— connector face to face positioning, see Figure 8;
— plug - receptacle shell alignment, see Figure 9;
— connector keyways polarization guide, see Figure 10;
— optical MT contact alignment, see Figure 11;
— alignment pins engagement into alignment hole – MT alignment, see Figure 12;
— MT physical contact, see Figure 13;
— optical contact latching spring compression, see Figure 14;
— connector locking mechanism alignment, see Figure 14;
— interfacial seal compression, see Figure 14.
oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Figure 8 — Face-to-face positioning

Figure 9 — Shell alignment (receptacle with plug)

Figure 10 — Keyways polarization guide

Figure 11 — Optical MT contact alignment (male with female)
oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Detail A
Figure 12 — Alignment pins engagement into alignment hole

Detail B
Figure 13 — MT physical contact

oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Detail C Detail D
NOTE L1 < L:
Key
L is the value when the two ferrules are in contact.
L1 is the value when the two ferrules are in compression.
Detail C: interfacial seal compression.
Detail D: connector locking mechanism alignment.
Figure 14 — Optical contact latching spring, interfacial seal compression and shell to shell
bottoming
5.5 Incorrect mating
Connector shell design, module and optical contact shall prevent incorrect mating of the plug onto the
receptacle.
A polarization key with a dedicated colour is present on each type of MT contact to mate with the
associated cavity.
Two different MT contact polarization keys (type) cannot be matched.
Two identical contacts cannot be mated.
Unable to pair:
— male MT contact with female MT contact of type different;
— male MT contact with male MT contact;
— female MT contact with female MT contact.

oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
5.6 MT contact mating and unmating sequence in module
The mating sequence shall be:
— face to face positioning, see Figure 15;
— alignment of the MT contact and module, see Figure 16;
— locking system and locking body, see Figure 17.

Figure 15 — Face-to-face positioning

Figure 16 — Alignment of the MT contact and module

Figure 17 — Locking system and locking body

oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
6 Definition drawings and masses
6.1 General
General dimensions and masses of receptacles, plugs and protective covers are given in the product
standards.
6.2 Receptacle
All housing dimensions are defined in EN 4165-001.
6.3 Plug
All housing dimensions are defined in EN 4165-001.
6.4 Modules
6.4.1 General
All module dimensions are defined in prEN 4733-003.
6.4.2 Rectangular plug and receptacle series 2 interface
Module and contact position inside centre coupling mechanism connector series 2: see Figure 18.
NOTE Given dimensions are those of the modules and optical MT contacts in rear position, position when the
connector is not mated. Other dimensions are in accordance with EN 4165 standards.
Dimensions and tolerances in millimetres

oSIST prEN 4733-001:2024
prEN 4733-001:2023 (E)
Detail A Detail B
Detail C Detail D
Figure 18 — Module and contact position inside centre coupling mechanism connector plug and
receptacle, series 2
6.4.3 Single module plug and receptacle series 2 interface
Module and contact position inside series 2 push-pull latching mechanism connector: see Figure 19.
NOTE Given dimensions are those of the modules
...