ISO/TR 21891:2017

Aerospace electrical requirements — Sleeves and moulded shapes — Specifications for aircraft use

ISO/TR 21891:2017 brings together, in a single list, those standards for insulation and/or mechanical/environmental protection sleeves and heat shrink moulded shapes that have been determined as being suitable for use on aircraft. The range of sleeves includes heat shrink, extruded (non-heat shrink) and textile.

Exigences électriques pour équipements aérospatiaux — Gaines et pièces moulées d’isolation — Spécification pour utilisation sur aeronef

General Information

• Status: Published
• Publication Date: 13-Jul-2017
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ISO/TC 20/SC 1 - Aerospace electrical requirements
• Drafting Committee: ISO/TC 20/SC 1 - Aerospace electrical requirements
• Current Stage: 6060 - International Standard published
• Due Date: 25-Jul-2019
• Completion Date: 14-Jul-2017

Standards Content (Sample)

TECHNICAL ISO/TR
REPORT 21891
First edition
2017-07
Aerospace electrical requirements —
Sleeves and moulded shapes —
Specifications for aircraft use
Exigences électriques pour équipements aérospatiaux — Gaines et
pièces moulées d’isolation — Spécification pour utilisation sur aeronef
Reference number
ISO/TR 21891:2017(E)
©
ISO 2017

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ISO/TR 21891:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

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ISO/TR 21891:2017(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 List of standards . 1
Bibliography . 7
© ISO 2017 – All rights reserved iii

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ISO/TR 21891:2017(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles,
Subcommittee SC 1, Aerospace electrical requirements.
iv © ISO 2017 – All rights reserved

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ISO/TR 21891:2017(E)

Introduction
This document has been drawn up by ISO/TC 20/SC 1 and IEC/SC 15C in order to create a list of IEC and
other standards for insulation and/or mechanical/environmental protection sleeves and heat shrink
moulded shapes suitable for use on aircraft. The range of sleeves includes heat shrink, extruded (non-
heat shrink) and textile. The list draws primarily upon IEC 60684 series for flexible insulating sleeving.
IEC 60684 series is an ongoing programme and new standards are being added periodically.
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TECHNICAL REPORT ISO/TR 21891:2017(E)
Aerospace electrical requirements — Sleeves and moulded
shapes — Specifications for aircraft use
1 Scope
This document brings together, in a single list, those standards for insulation
and/or mechanical/environmental protection sleeves and heat shrink moulded shapes that have been
determined as being suitable for use on aircraft. The range of sleeves includes heat shrink, extruded
(non-heat shrink) and textile.
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.
IEC 60684-1, Flexible insulating sleeving — Part 1: Definitions and general requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60684-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 List of standards
Table 1 gives the list of standards together with information on usage or any limitations for aircraft
applications.
Table 1 — List of applicable standards
Standard Description Usage, notes and related national
specifications (informative)
IEC 60684–1 Flexible insulating sleeving — Definitions and Top level technical specification
general requirements
IEC 60684–2 Flexible insulating sleeving — Methods of test Test methods
IEC 60684–3-116/118 Flexible insulating sleeving — Extruded Used for areas of occasional
polychloroprene contamination by mineral oils,
petroleum fuels, and mineral or cas-
tor oil based hydraulic fluids.
See also BS 4G 198-1 Type 1
IEC 60684–3-121/124 Flexible insulating sleeving — Extruded silicone Oil and hydraulic fluid resistant. Not
for contact with fuels.
See also BS 4G 198-1 Type 4
IEC 60684–3-136 Flexible insulating sleeving — Extruded Oil, hydraulic fluid and fuel resistant.
fluorosilicone
See also BS 4G 198-1 Type 3
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ISO/TR 21891:2017(E)

Table 1 (continued)
Standard Description Usage, notes and related national
specifications (informative)
IEC 60684–3-145/147 Flexible insulating sleeving — Extruded PTFE Slip-on sleeves suitable for
identification of electric cables and
insulated equipment wires.
Resistant to fuels, lubricants and
hydraulic fluids, including
ester-based lubricants and
ester-based hydraulic fluids.
See also BS 3G 198-2 Type 7
IEC 60684–3-165 Flexible insulating sleeving — Extruded This sleeving is flexible, flame
polyolefin, flame retarded, limited fire retarded and suitable for use in
hazard areas where smoke, gases or
corrosive by-products would
constitute a particular hazard.
IEC 60684–3-211 Flexible insulating sleeving — Heat shrink, ratio This sleeving is semi-rigid and flame
2:1, semi-rigid, polyolefin retarded. It is suitable where strain
relief and mechanical support are
required. It is available in colours
and transparent. The transparent
sleeving is not flame retarded.
See also:
BS 4G 198-3 Type 11C
AMS DTL 23053/6
IEC 60684–3-212 Flexible insulating sleeving — Heat shrink Type A and C sleevings are
polyolefin sleevings flexible and flame retarded. They
are suitable for general purposes. It
is available in colours and transpar-
ent. The transparent sleevings, type
B and D are not flame retarded. All
four types are available in 2:1 and
3:1 shrink ratios.
See also:
BS 4G 198-3 Type 11B
AMS DTL 23053/5
VG 95343-5 Type A and B
IEC 60684–3-216 Flexible insulating sleeving — Heat shrink, ratio This sleeving is flexible, flame
2:1/3:1, limited fire hazard retarded and emits minimum smoke,
gases and corrosive by-products
when exposed to fire. It is available
with various wall thicknesses and
also in a higher shrink ratio
according to the application and
degree of mechanical protection
required. It is suitable for use (e.g. as
cable protection) in areas where
smoke, gases or corrosive
by-products would constitute a
particular hazard.
See also:
BS 4G 198-3 Type 15
VG 95343-5 Type L
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ISO/TR 21891:2017(E)

Table 1 (continued)
Standard Description Usage, notes and related national
specifications (informative)
IEC 60684–3-240/243 Flexible insulating sleeving — Heat shrink PTFE This sleeving is milk-white
translucent. It is suitable for use
where resistance to chemicals and
high temperature performance are
required. It is flame resistant and
has a low or high shrink ratio
depending on type.
See also:
BS 3G 198-4 Type 21A/21B
AMS DTL 23053/12
IEC 60684–3-246 Flexible insulating sleeving — Heat shrink, ratio As these are non-flame retarded,
2:1, polyolefin, dual wall, not flame retarded they are non-preferred items.
Careful consideration is given to
the design application before use,
e.g. proximity to hot or flammable
components.
See also:
AMS DTL 23053/4 Class 1
IEC 60684–3-248 Flexible insulating sleeving — General purpose, These dual wall sleevings have flame
heat-shrinkable, dual wall polyolefin sleeving, retarded jackets and meltable liners
flame retarded, shrink ratios 2:1, 3:1, 4:1 for environmental sealing.
See also:
AMS DTL 23053/4 Class 3 shrink
ratio 3:1
IEC 60684–3-271 Flexible insulating sleeving — Heat shrink, ratio This sleeving has very good
2:1, elastomer, fluid resistant, flame retarded flexibility, is flame retarded and
has a thick wall for mechanical
protection. It is for use as cable
protection in areas where wiring is
subject to contamination by aircraft
fuels and hydraulic fluids. The
standard available colours are
black or red.
See also:
BS 4G 198-3 Type 10A
AMS DTL 23053/16
VG 95343-5 Type D
IEC 60684–3-340/342 Flexible insulating sleeving — Expandable This sleeving is constructed so that
braided polyethylene terephthalate textile it expands when compressed
sleeving, uncoated longitudinally. It has an open
weaved construction manufactured
from polyethylene terephthalate
monofilament yarns. It is used to
provide mechanical protection up
to temperatures of 130 °C.
IEC 60684–3-343/345 Flexible insulating sleeving — Expandable This s
...