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BS ISO 16049-1:2001

BS ISO 16049-1:2001

$142.49

Air cargo equipment. Restraint straps – Design criteria and testing methods

Published By Publication Date Number of Pages
BSI 2001 24
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PDF Pages PDF Title
3 Air cargo equipment�— Restraint straps�—
5 Contents Page
6 Foreword
7 Air cargo equipment�— Restraint straps�—
1��� Scope
1.1��� This part of ISO�16049
1.2��� The same restraint strap assemblies can also be used in other applications such as:
1.3��� This part of ISO�16049
1.4��� When restraint strap assemblies are attached to the edge rails of a certified air cargo pa…
1.5��� The use of reliable and guaranteed restraint strap assemblies does not alone ensure flight…
1.6��� Subject to proper operating instructions in accordance with
8 2��� Normative references
3��� Terms and definitions
12 4��� Design criteria
4.1��� Compatibility
4.2��� Ultimate load
4.3��� Elongation
4.3.1��� Care shall be taken in selecting the materials and design most appropriate to minimizing…
4.3.2��� The total elongation of the complete restraint strap assembly under load, as measured be…
4.3.3��� Webbing slippage through the tensioning device (see
4.3.4��� The total elongation when submitted to intermediate loads shall not exceed the linear re…
4.4��� Inflammability
4.4.1��� The webbing, as used in the restraint strap assembly, i.e. including sewing and any trea…
13 4.4.2��� The inflammability test shall be performed on a minimum of three specimens, and the aver…
4.5��� Environmental degradation
4.5.1��� The available data concerning degradation of woven textile fibre performance when expose…
4.5.2��� An expiry date after which the rated performance may not be expected to be maintained sh…
4.5.3��� For environmental degradation assessment, it should be assumed that the restraint strap …
4.5.4��� In addition, the strap assembly components and materials should be selected in order to …
4.6��� Dimensions
4.6.1��� Length
14 4.6.2��� Width
4.7��� Tensioning device
4.7.1��� The type of tensioning or tension retaining device shall be selected on agreement betwee…
4.7.2��� The thickness of the device when in its latched position shall be kept to a minimum cons…
4.7.3��� The loose end of the adjustable webbing shall be protected against fraying, and positive…
4.7.4��� Tensioning devices of the “flat” one stroke types should provide, when actuated, a minimum
4.7.5��� Tensioning device design shall aim at maximizing friction coefficients in order to obtai…
4.7.6��� The tensioning device shall be equipped with a positive, self-engaging, locking system i…
4.7.7��� The tensioning device shall be designed so that the locking system can be engaged and a …
4.7.8��� The tensioning device shall be designed so that, in the absence of any tension, it is po…
15 4.8��� End fittings
4.8.1��� The type(s) of end fittings, which may be different at each end of the restraint strap a…
4.8.2��� The thickness of end fittings shall be kept to a minimum consistent with their type, in …
4.8.3��� Flat hooks shall be equipped with a retainer preventing any risk of self or inadvertent …
4.8.4��� Wire hooks, D rings, or equivalent shall be duly welded in order to prevent any risk of …
4.8.5��� Two different end fittings may, at the purchaser’s option, be provided on one same end o…
4.9��� Webbing and sewing
4.9.1��� The materials and any treatment such as heat stabilization, flame resistance, dye, anti-…
4.9.2��� All seams shall be made from thread of which the Young modulus does not exceed that of t…
4.9.3��� Consideration should be given to anti abrasion treatment of the webbing, commensurate wi…
4.10��� General
4.10.1��� All parts or inner or outer edges of the tensioning device and the end fittings that ca…
4.10.2��� All metal parts shall be coated. Consideration should be given to anti-corrosion treatm…
16 4.10.3��� There shall be no sharp edges, corners or protrusions that may come into contact with t…
4.10.4��� The tensioning device, tension retaining device if any, and the end fittings shall be d…
5��� Testing methods
5.1��� General
5.1.1��� The following tests shall be conducted in order to ensure that the integrity and functio…
5.1.2��� The objective of the tests is to measure the performance of the complete restraint strap…
5.1.3��� Three test specimens randomly selected from the same production batch shall be used for …
5.2��� Testing apparatus
5.2.1��� Use a certified and calibrated tensile testing machine with a load measuring accuracy of
5.2.2��� Ensure that the machine is equipped with a load recording system (calibrated chart, dial…
5.2.3��� In order to provide comparable results, the pulling clamps should have a uniform speed of
5.2.4��� Prior to the test ensure that the machine is equipped with pulling attachments compatibl…
5.3��� Load test
5.3.1��� Step�1
17 5.3.2��� Step�2
5.3.3��� Step�3
5.3.4��� Step�4
5.3.5��� Step�5
5.3.6��� Testing is deemed successful if rupture occurs at a load higher than the rated ultimate …
5.3.7��� Repeat the test for the two other specimens. Record the results. Should one of the speci…
5.3.8��� If the tested restraint strap assembly includes double stud fitting type end fittings, t…
5.4��� Elongation test
5.4.1��� The elongation test shall be performed on the same specimens simultaneously with the loa…
5.4.2��� After step�1, two markers shall be taken on the specimen’s webbing, as far apart from ea…
5.4.3��� Apply step�3; Measure the new distance (
18 5.4.4��� Apply step�4. Measure the new distance (
5.4.5��� The measured elongation (
5.4.6��� Repeat the test for the two other specimens. Record the results. Average the values obta…
5.4.7��� If the tested restraint strap assembly includes double stud fitting type end fittings, t…
5.5��� Cyclic load test
5.5.1��� A cyclic load test should be performed to simulate the recurrent load cycles resulting f…
5.5.2��� The test apparatus is there to apply to the complete restraint strap assembly a tension …
5.5.3��� The restraint strap assembly shall be submitted to 100 such cycles (or more, if specifie…
5.5.4��� After the test, the restraint strap assembly shall be inspected for defects. There shall…
5.6��� Inflammability test
5.7��� Webbing elongation test
5.7.1��� In addition to the elongation test of the complete restraint strap assembly specified in
5.7.2��� The test tension loads to be used shall be those specified in steps�3 to 5 of
5.7.3��� One of the test methods listed in the Bibliography may be used.
5.8��� Webbing abrasion test
5.8.1��� A webbing abrasion test shall be performed, commensurate with the expected service life …
5.8.2��� After the specified abrasion test, steps 1, 2 and 5 of the load test specified in
5.8.3��� One of the test methods listed in the Bibliography may be used for the abrasion test.
19 5.9��� Test record
5.9.1��� The manufacturer shall maintain and hand over to the purchaser a restraint strap assembl…
5.9.2��� The test results to be mentioned shall include:
6��� Quality Control
6.1��� Industry’s experience demonstrates the essential character of continuous quality control i…
6.2��� In view of the possibility of such a minor change having been overlooked, detailed visual …
6.3��� Recommended minimum sampling rates (one test sample normally consisting of three complete …
6.4��� The parties (manufacturer and purchaser) shall contractually agree on a continuous (testin…
20 7��� Markings
7.1��� Each restraint strap assembly in accordance with
7.2��� The traceability code shall enable the unit’s manufacturing and (if recorded by the user) …
7.3��� The markings may be in whole or in part by any of the following means:
7.4��� If a label is provided, it is recommended that it also indicate the material of the webbin…
7.5��� Double stud tie-down fittings with an omnidirectional rated load capacity of
21 8��� Options
9��� Manufacturer’s instructions
22 10��� Operating instructions
10.1��� The effectiveness and dependability of restraint strap assemblies in aircraft, even if pr…
10.2��� Though it is not the intent of
10.3��� Accordingly, air cargo operators are encouraged to:
10.4��� The general utilization guidelines and the principles of tie-down calculation methods to …
23 Bibliography

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BS ISO 16049-1:2001
$142.49