MAC PARA ARAVIS Series, Руководство пользователя, Страница: 26 / 36

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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).
Risers
Visual inspection for signs of wear or abrasion. Differences to manual lengths should not
/-5mm.
Lines
Measuring the length of the lines is part of the regular paraglider inspection. The overall
length (riser lines + mid lines + upper lines) has to be checked under 5kg of tension, in
order to ensure reproducible results for a comparison with the lengths in the check sheets.
The lines have a considerable influence on flight behaviour. Correct line length and
symmetry are also important for performance and handling. Therefore we recommend a
check of the trimming every 50 hours or once a year.
Strength of the lines - An upper, middle and lower A-line, along with a lower B-line should
be tested for strength. Each line is tested to breaking point and the value recorded. The
minimum value is 14 G for all A+B lines, calculated from the maximum certified flying
weight of the glider. The added minimum strength for the middle lines and for the top lines
should be the same. 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 difference between the measured length and the original length
should not /- 10mm. The changes that could appear are a slight shrink on the B’s
and/or a slight stretch on the A’s. The consequences of these changes can include a
slower trim speed, difficult inflation etc.
The overall length measurement may deviate from the manufacturer's specifications within
limit of +/- 40 mm. The basis for the trimming is only the official length information in this
manual as a reference. I.e., the differences in the lengths of the lines (A, B, C, D) on each
rib must correspond to the differences given in this manual.
Environmental conditions such as high temperatures or moisture can affect lines lengths.
Check the line lengths regularly, particularly if you notice any change in launch or flight
behaviour. The lines lengths should be checked if you have landed in water or if the lines
have got wet through. Lines age and lose strength even if the paraglider is used
infrequently or not at all. This can affect the safety and function of your paraglider.
Signs of wear are slight bumps or changes in flying characteristics. The lines must then be
replaced immediately. Use only inspected and approved lines, which can be obtained
through MAC PARA.
Do not under any circumstances use knots to shorten the lines. Any knot will weaken the
line considerably and may cause the line to break in case of high load. The overhand knot
and bowline knots described are permitted only for connecting the main brake lines/brake
handle.
Finally, a flight test to confirm that the wing behaves normally should be carried out by a
professional.