ISO 21100:2025

FINAL DRAFT
International
Standard
ISO/FDIS 21100
ISO/TC 20/SC 9
Air cargo unit load devices —
Secretariat: AFNOR
Performance requirements and test
Voting begins on:
parameters
2025-04-23
Unités de charge de fret aérien — Exigences de performances et
Voting terminates on:
paramètres d'essai
2025-06-18
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 21100:2025(en) © ISO 2025

FINAL DRAFT
ISO/FDIS 21100:2025(en)
International
Standard
ISO/FDIS 21100
ISO/TC 20/SC 9
Air cargo unit load devices —
Secretariat: AFNOR
Performance requirements and test
Voting begins on:
parameters
Unités de charge de fret aérien — Exigences de performances et
Voting terminates on:
paramètres d'essai
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 SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 21100:2025(en) © ISO 2025

ii
ISO/FDIS 21100:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 3
4.1 Types .3
4.2 Sizes .3
4.3 Configurations .3
4.4 Forms .4
4.5 Classification identifier .4
5 Performance requirements . . 4
5.1 Materials .4
5.2 Fabrication methods and workmanship .4
5.3 Protection .4
5.4 Construction .4
5.5 Marking .5
5.6 Inspection provisions .5
5.7 Fire protection .5
5.8 Rapid decompression.5
5.9 Dimensions and tolerances . .5
5.10 Strength .5
5.10.1 Ultimate load criteria .5
5.10.2 Restraint criteria.6
5.10.3 Pallets and nets.6
5.10.4 Base performance .6
5.11 Environmental degradation .7
6 Tests . 7
6.1 Test requirements.7
6.2 Test parameters .7
6.3 Test methods .7
6.4 Test results .7
7 Additional information . 7
7.1 Intended use .7
7.2 Unit load device capacities .7
7.3 Container contours .8
7.4 Pallet configurations .8
8 Unit load device configurations . 8
8.1 General .8
8.2 ULD configuration A7 .9
8.3 ULD configuration A8 .10
8.4 ULD configuration B7 .11
8.5 ULD configuration B8 . 12
8.6 ULD configuration G1 .14
8.7 ULD configuration K4 .16
8.8 ULD configuration L5 .17
8.9 ULD configuration L6 .18
8.10 ULD configuration M4 .19
8.11 ULD configuration M5 . 20
8.12 ULD configuration N1 . . 22
8.13 ULD configuration P1 . 23
8.14 ULD configuration Q1 . 23

iii
ISO/FDIS 21100:2025(en)
8.15 ULD configuration R1 .24
8.16 ULD configuration S1 . . 26
8.17 ULD configuration T1 .27
8.18 ULD configuration U1 . 28
9 Testing restraint conditions .29
9.1 General .
...

ISO/FDIS 21100:2025 (E)
ISO/TC 20/SC 9
Secretariat: AFNOR
Date: 2025-01-2004-08
Air cargo unit load devices — Performance requirements and test
parameters
Unités de charge de fret aérien — Exigences de performances et paramètres d'essai
FDIS stage
ISO #####-#:####(X/FDIS 21100:2025(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
© ISO #### 2025 – All rights reserved
ii
ISO/FDIS 21100:2025 (E(en)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification. 3
4.1 Types . 3
4.2 Sizes . 3
4.3 Configurations . 4
4.4 Forms . 4
4.5 Classification identifier . 4
5 Performance requirements . 4
5.1 Materials . 4
5.2 Fabrication methods and workmanship . 5
5.3 Protection . 5
5.4 Construction . 5
5.5 Marking . 5
5.6 Inspection provisions . 5
5.7 Fire protection . 5
5.8 Rapid decompression . 6
5.9 Dimensions and tolerances . 6
5.10 Strength . 6
5.11 Environmental degradation . 7
6 Tests . 7
6.1 Test requirements . 7
6.2 Test parameters . 7
6.3 Test methods . 7
6.4 Test results . 8
7 Additional information . 8
7.1 Intended use . 8
7.2 Unit load device capacities . 8
7.3 Container contours . 8
7.4 Pallet configurations . 8
8 Unit load device configurations . 8
8.1 General . 8
8.2 ULD configuration A7 . 9
8.3 ULD configuration A8 . 12
8.4 ULD configuration B7 . 14
8.5 ULD configuration B8 . 17
8.6 ULD configuration G1 . 19
8.7 ULD configuration K4 . 22
8.8 ULD configuration L5 . 24
8.9 ULD configuration L6 . 26
8.10 ULD configuration M4 . 29
8.11 ULD configuration M5 . 32
8.12 ULD configuration N1 . 34
8.13 ULD configuration P1 . 36
8.14 ULD configuration Q1 . 37
iii
ISO #####-#:####(X/FDIS 21100:2025(en)
8.15 ULD configuration R1 . 39
8.16 ULD configuration S1 . 42
8.17 ULD configuration T1 . 44
8.18 ULD configuration U1 . 45
9 Testing restraint conditions . 47
9.1 General . 47
9.2 Restraint condition (RC) A1 . 48
9.3 Restraint condition (RC) A2 . 50
9.4 Restraint condition (RC) G . 52
9.5 Restraint condition (RC) K . 54
9.6 Restraint condition (RC) L . 57
9.7 Restraint condition (RC) N . 61
9.8 Restraint condition (RC) P . 62
9.9 Restraint condition (RC) Q . 65
9.10 Restraint condition (RC) R . 68
9.11 Restraint condition (RC) T . 70
9.12 Restraint condition (RC) U . 72
Bibliography . 77

© ISO #### 2025 – All rights reserved
iv
ISO/FDIS 21100:2025 (E(en)
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 committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. 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 documentsdocument should be noted. This document was drafted in accordance with the editorial rules
of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 9, Air cargo and ground equipment.
This third edition cancels and replaces the second edition (ISO 21100:2020), which has been
technically revised.
The main changes are as follows:
— — addition of T and U size and their respective restraint conditions.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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