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The tearing resistance of the cloth - A non-destructive test following the TS-108 standard
which specifies minimum tear strength for sky diving canopies should be made using a
Bettsometer. (B.M.A.A. Approved Patent No. GB 2270768 Clive Betts Sails)
Strength of the lines - An upper, middle and lower A line, along with a lower B and a lower
C (and lower D if applicable) line should be tested for strength. Each line is tested to breaking
point and the value recorded. The minimum value is 14G for all main riser lines calculated
from the maximum certified flying weight of the glider. The added minimum strength for the
middle lines and upper lines should be the same value. If the breaking strength is too close to
the minimum value calculated, the professional should give a period after which you will have
to test the strength of the lines again.
Lengths of the lines - The overall length (riser lines + mid lines + upper lines) has to be
checked under 5Kgs of tension. The difference between the measured length and the original
length should not /- 10mm. The changes that could appear are a slight shrink on the
C or Ds and/or a slight stretch on the A, B. The consequences of these changes can include a
slower trim speed, difficult inflation etc.
Risers - Visual inspection for signs of wear or abrasion. Differences to manual lengths should
not exceed +/-5mm.
Canopy check - A full visual check should be carried out: All the components of the wing
(stitching, ribs, diagonals, lines, tabs, ...) should be checked for signs of deterioration.
Finally, a test flight to confirm that the wing behaves normally should be carried out by a
professional.
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