ISO 21894:2020
(Main)Air cargo — Cargo stopper devices — Design and testing
Air cargo — Cargo stopper devices — Design and testing
This document specifies the design, performance and testing requirements for "Cargo Stopper" air cargo restraint accessories with a 22 250 N (5 000 lbf) rated load capacity, to be used in conjunction with air cargo restraint straps meeting ISO 16049-1 (TSO/ETSO ̶ C172), or air cargo restraint slings meeting ISO 20291-1, with the same rated load. Cargo stopper devices designed to this document are intended to be used in either of the following typical instances: a) to ensure restraint/tie-down of a piece of cargo that does not lend itself to either direct hooking of tie-down straps or passing a strap around without risk of slippage; a common example is long shaped cargo items with a narrow cross-section, whether or not overhanging from the pallet, individual or in bundles, e.g. pipes or beams; see ISO 16049-2:2020, 7.4; b) to restrain cargo smaller than the pallet net's mesh, or identified as "piercing" cargo, presenting a hazard to the aircraft in the event of it being released during flight; c) when a crate containing cargo, even though its cross-section is large enough to be directly tied-down with the pallet net or restraint straps, contains or can contain a heavy item, e.g. a piece of machinery, shaft, or similar, with a cross-section lower than the pallet net's mesh size; NOTE Such "hidden" items have been known to break free from insufficiently strong crates when subjected to in-flight accelerations, then pass due to their small size through the net mesh restraining the crate and be released into the cargo compartment. d) to assist in tying-down odd-shaped cargo pieces where it is difficult or not allowed to directly attach tie-down straps or pass them around the load in an effective manner.
Fret aérien — Dispositifs stop charge — Conception et essais
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 21894
First edition
2020-02
Air cargo — Cargo stopper devices —
Design and testing
Fret aérien — Dispositifs stop charge — Conception et essais
Reference number
ISO 21894:2020(E)
©
ISO 2020
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ISO 21894:2020(E)
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ISO 21894:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
5 Testing . 4
5.1 Load test . 4
5.2 Puncture test . 5
5.3 Flammability test . 5
5.4 Other tests . 5
5.5 Test report . 5
6 Markings . 5
7 Quality control . 6
7.1 Design and production . 6
7.2 Operation . 6
Bibliography . 8
© ISO 2020 – All rights reserved iii
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ISO 21894:2020(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles,
Subcommittee SC 9, Air cargo and ground equipment.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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ISO 21894:2020(E)
Introduction
This document specifies the design, performance and testing requirements for “cargo stopper” devices
intended to be used in conjunction with restraint straps for cargo restraint on board civil transport
aircraft.
The civil aviation requirements referred to in this document are those relating to operation of transport
aircraft. They constitute the set of operation requirements internationally agreed in application of
International Civil Aviation Organization (ICAO) Annex 6, Operation of aircraft, to the Convention on
International Civil Aviation.
Throughout this document, the minimum essential criteria are identified by use of the key word "shall".
Recommended criteria are identified by use of the key word “should” and, while not mandatory, are
considered to be of primary importance in providing safe restraint arrangements on board aircraft.
Deviation from recommended criteria should only occur after careful consideration and thorough
service evaluation have shown alternate methods to provide an equivalent level of safety.
Dimensions are expressed in millimetres, and forces in newtons. Equivalent inch-pound system units
are given between brackets for information.
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INTERNATIONAL STANDARD ISO 21894:2020(E)
Air cargo — Cargo stopper devices — Design and testing
1 Scope
This document specifies the design, performance and testing requirements for “Cargo Stopper” air
cargo restraint accessories with a 22 250 N (5 000 lbf) rated load capacity, to be used in conjunction
with air cargo restraint straps meeting ISO 16049-1 (TSO/ETSO ̶ C172), or air cargo restraint slings
meeting ISO 20291-1, with the same rated load.
Cargo stopper devices designed to this document are intended to be used in either of the following
typical instances:
a) to ensure restraint/tie-down of a piece of cargo that does not lend itself to either direct hooking
of tie-down straps or passing a strap around without risk of slippage; a common example is long
shaped cargo items with a narrow cross-section, whether or not overhanging from the pallet,
individual or in bundles, e.g. pipes or beams; see ISO 16049-2:2020, 7.4;
b) to restrain cargo smaller than the pallet net’s mesh, or identified as “piercing” cargo, presenting a
hazard to the aircraft in the event of it being released during flight;
c) when a crate containing cargo, even though its cross-section is large enough to be directly tied-
down with the pallet net or restraint straps, contains or can contain a heavy item, e.g. a piece of
machinery, shaft, or similar, with a cross-section lower than the pallet net’s mesh size;
NOTE Such “hidden” items have been known to break free from insufficiently strong crates when
subjected to in-flight accelerations, then pass due to their small size through the net mesh restraining the
crate and be released into the cargo compartment.
d) to assist in tying-down odd-shaped cargo pieces where it is difficult or not allowed to directly
attach tie-down straps or pass them around the load in an effective manner.
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.
ISO 7166, Aircraft — Rail and stud configuration for passenger equipment and cargo restraint
ISO 9788, Air cargo — Double stud tie-down fittings — Design and testing requirements
ISO 10254, Air cargo and ground equipment — Vocabulary
ISO 12236, Geosynthetics — Static puncture test (CBR test)
ISO 16049-1, Air cargo equipment — Restraint straps — Part 1: Design criteria and testing methods
ISO 16049-2, Air cargo equipment — Restraint straps — Part 2: Utilization guidelines and lashing
calculations
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 10254 and the following apply.
© ISO 2020 – All rights reserved 1
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ISO 21894:2020(E)
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3.1
breaking force
BF
lowest load at which a unit under tensile test exhibits part or complete failure
Note 1 to entry: Deformations are not accounted as a failure.
3.2
interlinking straps
cargo stopper straps sewn at an angle with the tension straps (3.4), forming a web to adapt the shape of
the piece of cargo but which do not transmit the in-flight loads, to which they are perpendicular
3.3
"piercing" cargo
piece of cargo of a piercing or penetrating nature, such as rods, pipes, extrusions, beams, etc., that could
become a projectile under flight operational loads
3.4
tension straps
cargo stopper straps which attach to the pallet through other straps or slings, and transmit in-flight
loads, with which they form a low angle
4 Requirements
4.1 Cargo stopper devices (see typical examples in Figure 1) shall be built from sewn lengths of cargo
restraint straps grade webbing, performing two different roles:
a) tension straps connecting to the main restraint arrangement straps and able to withstand the
same forces;
b) interlinking straps forming a web like structure in order to prevent passage of small cross-section
items, stitched together with supplemental continuous flexible material to fill the gaps between
tension straps.
4.2 The tension straps shall consist
...
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