ISO 21894 pdf free download

ISO 21894-2020 pdf free download.Air cargo一Cargo stopper devices一 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.
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 and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
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 St raps (iA)0 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 A.ISO 21894 pdf download.