BS EN 3660-001:2016

BSI Standards Publication

Aerospace series — Cable
outlet accessories for circular
and rectangular electrical and
optical connectors
Part 001: Technical specification


BS EN 3660-001:2016

BRITISH STANDARD

National foreword
This British Standard is the UK implementation of EN 3660-001:2016.
It supersedes BS EN 3660-001:2006 which is withdrawn.
The UK participation in its preparation was entrusted to Technical
Committee ACE/6, Aerospace avionic electrical and fibre optic
technology.
A list of organizations represented on this committee can be
obtained on request to its secretary.
This publication does not purport to include all the necessary
provisions of a contract. Users are responsible for its correct
application.
© The British Standards Institution 2016.
Published by BSI Standards Limited 2016
ISBN 978 0 580 89611 8
ICS 49.060
Compliance with a British Standard cannot confer immunity from

legal obligations.
This British Standard was published under the authority of the
Standards Policy and Strategy Committee on 31 January 2016.
Amendments/corrigenda issued since publication
Date

Text affected


BS EN 3660-001:2016

EN 3660-001

EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM

January 2016

ICS 49.060

Supersedes EN 3660-001:2006

English Version

Aerospace series - Cable outlet accessories for circular and
rectangular electrical and optical connectors - Part 001:
Technical specification
Série aérospatiale - Accessoires arrière pour
connecteurs circulaires et rectangulaires électriques et

optiques - Partie 001 : Spécification technique

Luft- und Raumfahrt - Endgehäuse für elektrische und
optische Rund- und Rechtecksteckverbinder - Teil 001:
Technische Lieferbedingungen

This European Standard was approved by CEN on 8 June 2015.
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, 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
© 2016 CEN

All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.

Ref. No. EN 3660-001:2016 E



BS EN 3660-001:2016
EN 3660-001:2016 (E)

Contents

Page

European foreword ...................................................................................................................................................... 3
1

Scope .................................................................................................................................................................... 4

2

Normative references .................................................................................................................................... 4

3

Terms and definitions ................................................................................................................................... 5

4

Conditions of use ............................................................................................................................................. 5

5

Design and description ................................................................................................................................. 6


6

Dimensions and mass .................................................................................................................................... 6

7

Operation ........................................................................................................................................................... 7

8

Tests ..................................................................................................................................................................... 7

9

Quality assurance............................................................................................................................................ 9

10

Designation and marking ........................................................................................................................... 13

11

Delivery condition ........................................................................................................................................ 13

12

Packaging ......................................................................................................................................................... 13

13


Storage .............................................................................................................................................................. 14

2


BS EN 3660-001:2016
EN 3660-001:2016 (E)

European foreword
This document (EN 3660-001:2016) 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 European
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 July 2016, and conflicting national standards shall be
withdrawn at the latest by July 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 3660-001:2006.

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, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


3


BS EN 3660-001:2016
EN 3660-001:2016 (E)

1 Scope
This European Standard defines cable outlet accessories for use with circular and rectangular, electrical
and optical connectors on aerospace equipment. These may be sealed or unsealed and include
accessories suitable for the suppression of radio frequency and electromagnetic interference.

This European Standard is used in conjunction with circular and rectangular electrical and optical
connectors for varying temperature ranges, environmental conditions, fire resistant and non-fire
resistant applications as designated in the product standards.

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 2591- 1), Aerospace series — Elements of electrical and optical connection — Test methods

EN 3660-002, Aerospace series — Cable outlet accessories for circular and rectangular electrical and
optical connectors — Part 002: Index of product standards
EN 9100, Aerospace series — Quality Management Systems — Requirements for Aviation, Space and
Defense Organizations

EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace
standard parts

ISO 261, ISO general purpose metric screw threads — General plan

ISO 263, ISO inch screw threads — General plan and selection for screws, bolts and nuts — Diameter
range 0.06 to 6 in
ISO 965-1, ISO general-purpose metric screw threads — Tolerances — Part 1: Principles and basic data

IEC 60050-581, International electrotechnical vocabulary — Electromechanical components for
electronic equipment
MIL-HDBK-454B, General Guidelines for Electronic Equipment 2)

1) All parts quoted in Table 3.
2) Published by: DoD National (US) Mil. Department of Defense />
4


BS EN 3660-001:2016
EN 3660-001:2016 (E)

3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-581 apply together
with the following.
3.1
backshell
non-preferred term, use cable outlet accessory

3.2
cable screen termination
a device for terminating the cable screen to the cable outlet and giving electrical continuity
3.3
cable tie

a flexible strap or cord for securing a cable bundle to a cable outlet

3.4
coupling nut
an accessory or part of a component which secures the cable outlet to the body of the connector

4 Conditions of use
4.1 General

In accordance with the individual the product standard, refer to EN 3660-002.

4.2 Accessory styles
See Table 1.

Table 1
Style

Description

A

Cable outlet, unsealed

C

Cable outlet, shielded, unsealed

B

D

E
F

G

H
J

K
Z

Cable outlet, sealed

Cable outlet, shielded, sealed
Conduit adapter, unsealed
Conduit adapter, sealed

Adaptor (misc. incl. rectangular), unsealed
Adaptor (misc. incl. rectangular), sealed

Cable outlet, for heat shrinkable boot, sealed

Cable outlet, for heat shrinkable boot, shielded, sealed
Various components, tools

5


BS EN 3660-001:2016
EN 3660-001:2016 (E)


4.3 Material/finish classes
See Table 2.

Table 2

Class

Temperature range

A

− 65 °C to 175 °C

Aluminium/black anodised

K

− 65 °C to 260 °C

Stainless steel/passivated

J

KE
M

N(F)
P


T

W
Z

− 65 °C to 175 °C
− 65 °C to 200 °C
− 65 °C to 200 °C
− 65 °C to 200 °C
− 65 °C to 175 °C
− 65 °C to 175 °C
− 65 °C to 175 °C
− 65 °C to 175 °C

Material/finish
Non-metallic/olive drab cadmium plated
Stainless steel/passivated

Non-metallic/electroless nickel plated
Aluminium/electroless nickel plated
Non-metallic/unplated

Aluminium /nickel PTFE(Teflon) plated
Aluminium/olive drab cadmium plated
Aluminium/black zinc nickel plated

5 Design and description
5.1 Design
Cable outlet accessories shall be designed and constructed to withstand normal handling incident to
installation and maintenance in service. They shall be capable of being fitted to and removed from

connectors by use of hand only unless otherwise specified in the product standard. The cable outlet
accessory product standard shall contain outline drawings relating to general installation and
interchangeability.

5.2 Materials

Materials shall be suitable for the purpose intended and as specified in the product standard. When a
definite material is not specified, a material shall be used which will enable the accessory to meet the
performance requirements specified in the product standard.

When dissimilar materials are employed in intimate contact with each other, protection against
corrosion shall be used to ensure that the differential electromotive potential does not exceed 0,25 V.

5.3 Finish

The finish shall be in accordance with the product standard.

5.4 Threads

The threads shall conform to either ISO 261, ISO 263 or ISO 965-1 where applicable.

6 Dimensions and mass

The dimensions of cable outlets and their mass shall be as defined in the product standard.
6


BS EN 3660-001:2016
EN 3660-001:2016 (E)


7 Operation
Installation instructions and tooling, where necessary, shall be defined in the product standard.

8 Tests

Tests from the parts of EN 2591-100 applicable to cable outlet accessories are detailed in Table 3.

All tests shall be carried out with the cable outlet accessory fitted to a receptacle connector or
simulation thereof unless otherwise specified in the product standard.
Table 3

EN 2591-

Designation of the test

101

Visual inspection

102

Examination of dimensions and mass

205

Housing (shell) electrical continuity

212

Shielding effectiveness

from 100 MHz to 1 GHz

212
214

Surface transfer impedance
(from 100 MHz to 1 GHz) a

Lightning strike, current and voltage
pulse

301

Endurance at temperature

306

Mould growth

305
307

Rapid change of temperature
Salt mist

Remarks
Initial examination.
Details to be examined:
identification of materials in accordance with
the product standard.

– identification;
– appearance;
– marking;
– surface finish.
Final examination.
No loosening of parts, cracks, excessive wear,
detached part, etc. shall be observed.
In accordance with the product standard.

NOTE
In the case of an approved inspection
system, piece parts (without relation to
manufacturing batches of finished products) can be
used for dimensional inspection.

In accordance with the product standard

In accordance with the product standard
In accordance with the product standard

In accordance with the product standard.
Test set up and mounting should be as per
EN 2591-214, except the accessory under test
shall be fitted directly to an empty receptacle
connector or suitable simulation thereof (no
plug connector is required).
In accordance with the product standard
In accordance with the product standard

Unless otherwise required by the product

standard Method A. Duration 28 days. Nil
Growth. No prior washing. No surface etching.
In accordance with the product standard

7


BS EN 3660-001:2016
EN 3660-001:2016 (E)

EN 2591-

Designation of the test

308

Sand and dust

In accordance with the product standard

315

Fluid resistance

In accordance with the product standard

314
316
317
318

402

Immersion at low air pressure
Ozone resistance
Flammability

Fire-resistance
Shock

403

Sinusoidal and random vibration

406

Mechanical endurance

420

Mechanical strength of rear
accessories

423

Connector rear accessories thread
strength

408

422

513
515

Mating and unmating forces

Locking wire hole strength
Magnetic permeability
Hydrolytic stability

a 1 GHz to 10 GHz under consideration.

8

Remarks
In accordance with the product standard
In accordance with the product standard

In accordance with the product standard
In accordance with the product standard

In accordance with the product standard
Mounting:
A counterpart receptacle connector, mounted on
a suitable fixture, shall be attached to the shock
machine. The wired mating plug connector and
connector accessory shall be engaged with the
receptacle connector by normal locking means.
The cable shall be clamped to a fixed point at
least 200 mm from the rear of the assembly.


In accordance with the product standard
Mounting:
A counterpart receptacle connector shall be
mounted on a fixture, which in turn shall be
attached to the vibration table. The fully wired
counterpart connector or approved modification
to fixturing and connector accessory shall be
engaged with the receptacle by normal locking
means. No safety wire shall be used. The sensing
device shall monitor vibration at a point on or
near the receptacle connector. Any cable shall be
supported a minimum of 200 mm from the end
of the accessory.
In accordance with the product standard

In accordance with the product standard
Mounting;
Samples shall be coupled to a receptacle shell of
simulation thereof, which is in turn mounted to
a suitable torque measuring device.
In accordance with the product standard
In accordance with the product standard

In accordance with the product standard
In accordance with the product standard
In accordance with the product standard


BS EN 3660-001:2016
EN 3660-001:2016 (E)


9 Quality assurance
9.1 General
Quality assurance shall conform to the requirements of EN 9133 and the manufacturer’s quality
systems shall conform to EN 9100.

9.2 Conditions for qualification
9.2.1 Initial qualification

Initial qualification of a cable outlet accessory is obtained:

 either when specimens as defined in 9.2.2 have satisfied the applicable tests in Group 0, Group 1,
Group 2, Group 3 and Group 4 (see Tables 5, 6, 7 ,8 and 9).

9.2.2 Sampling and definition of specimens

Four sample cable outlet accessories shall be provided in each of two sizes, a total of eight. For circular
connectors these shall be small (shell size 08 to 13) and large (shell size 20 and larger). For samples for
rectangular connectors, refer to the product standard. The eight samples shall be divided into Group 0
and Group 1 (or Groups 3 and 4) as shown in Table 4 and prepared as instructed in 9.2.3. Thirteen
samples shall also be provided for Group 2 (fluid resistance test). An additional 2 samples (small and
large), for Group 5, shall also be provided if lightning strike applies in the product standard.
Table 4

Shell
size
range

Small


Large

Allocation of specimens
Groups 0 and 3

Groups 1 and 4

Group 5

Group 2
–

Min.
cable bundle
diameter

Max.
cable bundle
diameter

Min.
cable bundle
diameter

Max.
cable bundle
diameter

Max.
cable bundle

diameter

1

1

1

1

1

1

1

1

1

1

13 Total

9.2.3 Preparation of specimens
All samples shall be coupled to a qualified receptacle connector or simulation thereof unless otherwise
specified in the product standard. Where tests in the product standard requires specimens to be wired,
50 % of the specimens shall be wired with a minimum cable bundle diameter and 50 % of the
specimens with a maximum in accordance with the cable entry range specified in the product standard.
9.2.4 Programme of qualification tests


The qualification approval tests defined in Tables 5, 6, 7, 8, 9 and 10 shall be carried out in the sequence
indicated.

Test EN 2591-306 is to be performed on materials and is not included in the test groups. If the materials
used conform to MIL-HDBK-454B, guideline 4, Group 1, test EN 2591-306 is not required to be
performed.
9


BS EN 3660-001:2016
EN 3660-001:2016 (E)

Table 5
Designation of the test

2591-

Group 0

Remarks
All styles unless stated below or in the product
standard

Visual examination

101

Housing (shell) electrical continuity


205

See the product standard.

212

See the product standard.

Examination of dimensions and mass
Surface transfer impedance
(from 100 MHz to 1 GHz) a
Shielding effectiveness
from 100 MHz to 1 GHz a

Mating and unmating forces
Mechanical endurance

Mechanical strength of rear accessories
Locking wire hole strength

Sinusoidal and random vibration
Shock

Immersion at low air pressure
Visual examination
Salt mist

Housing (shell) electrical continuity
Surface transfer impedance
from 100 MHz to 1 GHz a

Shielding effectiveness
from 100 MHz to 1 GHz a

Mating and unmating forces

Connector rear accessories thread
strength
Visual examination
a

10

1 GHz to 10 GHz under consideration.

102
212
408
406
420
422
403
402
314
101
307

See the product standard.
Only styles with anti-decoupling device
See the product standard.


Only styles with wire locking holes
Only sealed styles

205

See the product standard.

212

See the product standard.

212
408
423
101

See the product standard.
Only styles with anti-decoupling device
See the product standard.


BS EN 3660-001:2016
EN 3660-001:2016 (E)

Table 6
Designation of the test

2591-

Group 1

Visual examination

101

Magnetic permeability

513

Examination of dimensions and mass
Endurance at temperature

Rapid change of temperature
Sand and dust

Ozone resistance

Visual examination
Flammability

Fire resistance

Remarks
All styles unless stated below or in the product
standard

102
301
305

Only styles containing non-metallic elements


316

Only styles containing non-metallic elements

308
101
317
318

Only styles with anti-decoupling devices
See the product standard.

See the product standard.

Table 7
Designation of the test

2591-

Group 2
Visual examination

101

Mating and unmating forces

408

Examination of dimensions and mass

Fluid resistance

Examination of dimensions and mass
Visual examination

102
315
102

Remarks
Only styles containing non-metallic elements
Only styles with anti-decoupling devices

Only styles containing non-metallic elements

101
Table 8

Designation of the test

2591-

Group 3
Visual examination

101

Hydrolytic stability

515


Examination of dimensions and mass
Visual examination

Remarks
Only styles containing non-metallic elements

102
101

11


BS EN 3660-001:2016
EN 3660-001:2016 (E)

Table 9
Designation of the test

2591-

Group 4

Remarks
All styles unless stated below or in the product
standard

Visual examination

101


Mating and unmating forces

408

Only styles with anti-decoupling devices

314

Only sealed styles

205

See the product standard.

Examination of dimensions and mass
Mechanical endurance

Immersion at low air pressure
Salt mist

Housing (shell) electrical continuity
Visual examination

102
406
307
101

Table 10

Designation of the test

2591-

Group 5

Remarks
All styles unless stated below or in the product
standard. This test group does not apply if
lightning strike is not required in the product
standard.

Visual examination

101

Housing (shell) electrical continuity

205

See the product standard.

205

See the product standard.

Examination of dimensions and mass
Lightning strike, current and voltage
pulse
Housing (shell) electrical continuity

Visual examination

102
214
101

See the product standard.

9.2.5 Extension of qualification
EN 9133 permits Qualification by Similarity.

For parts which differ only in minor details from those already submitted for qualification, the
manufacturer shall provide data from control drawings which describes the similarities to already
qualified parts. This data shall be tabulated in the Qualification Test Plan (QTP) and compared against
requirements in the product standard for which qualification is sought. The extent of qualification
testing by similarity shall be clearly specified by the manufacturer and approved by the Mandated Body.

9.3 Conditions for acceptance testing and inspection

The conditions for acceptance testing and inspection are defined in either the product standard or in
other definition documents.
12


BS EN 3660-001:2016
EN 3660-001:2016 (E)

9.4 Quality control
The conditions for quality control are defined in EN 9100.


9.5 Maintenance of qualification
See EN 9133.

10 Designation and marking
10.1 Designation of cable outlet accessory
EXAMPLE

Description block
CABLE OUTLET ACCESSORY

Identity block
EN3660-XXXXXXXX

Standard number

Material/finish (see the product standard)
Shell size (see the product standard)
Variant (see the product standard)
Variant (see the product standard)
NOTE 1
NOTE 2

No gaps are required between sections in the part number when printed.

If necessary, the code I9005 shall be placed between the description block and the identity block.

10.2 Marking

Marking shall be applied as follows and shall include:
 the designation as defined in 10.1;


 the date of manufacture (year/week);

 the manufacturers name or trademark.

11 Delivery condition

Delivery conditions shall be in accordance with the product standard.

12 Packaging

Cable outlet accessories shall be packed in transparent, inert plastic bags in accordance with EN 2591100.

13


BS EN 3660-001:2016
EN 3660-001:2016 (E)

13 Storage
Storage shall be in a place free from ultra-violet rays.

Every five years an inspection shall be made in accordance with test EN 2591-101. The date of
inspection shall be marked on and the component re-packed in accordance with Clause 12.

14


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