With MADparapente’s paragliding and paramotoring workshop we follow the same quality methods and standards as the OZONE Company.

Give us at 605 332 080 to get an appointment or else contact us by e-mail to madparapente@hotmail.com


The sail and the lines don’t age at the same rate and it’s quite possible that the line set, or at least part of it, will have to be replaced during the normal lifespan of the wing. The condition of the line set will always have an influence on the overall state of the wing and its airworthiness. Due to the nature of the used materials, it’s quite usual for the lines to change length and/or resistance throughout time and use – with just a little deviation from the trim, the in-flight’s normality can be affected. Therefore it’s crucial that lines should be frequently revised, checking that the length and strength are correct.

Visual checking is done to detect any possible external damage, to revise the break handle knots and if these ones also show any signs of being worn. Any line with a visibly damaged sheathing should be replaced.

Taller de parapente


To test the strength of the line set the breaking point value should be measured and recorded for the middle and lower A line should be measured, together with a lower B and lower C (and lower D line if applicable). The minimum value is 8g for all lower A+B lines and of 6g for all remaining lower lines, calculated from the maximum certified flying weight for the size of the glider. The sum of the minimum strength of the mid lines and top lines should be equal.

If the breaking strength is too close to the calculated minimum value, a professional technician should check them out with more lines and a period of time will be given before the strength of the lines should be examined again (usually 6-12months).

  • – the lowest accepted value for lines A and B is the result of the following operations: [(PTVMax*8) / (number of lines A+B, without stabilo)]
  • – the highest accepted value for lines C and D is the result of the following operations: [(PTVMax*6) / (number of lines C+D, without stabilo)]
  • – For upper lines the minimum accepted weight is 30Kg

Where PTV Max is the all up maximum weight for the type of glider. For example, for a ‘Rush 2’ model the maximum all up weight is 135Kg (for size XL) and it has 6 A lines and 6 B lines, meaning that the lowest accepted value for an A line would be (135*8)/12 = 90Kg.

This is the standard EN/LFT calculation for line strength tests.


The total length (riser lines + mid lines + upper lines) has to be tested under the exact tension force of 5DaN. The difference between the measured lengths from the original lengths cannot exceed +/-10mm. The length of the of the line connection tabs is also included in the measurement. Contact your sail’s maker company for the correct line length charts for each specific wing.

Any significant difference with the overall line length will take the wing out of the certified trim and will possibly endanger your flight. The consequences of any changes can mean a slower trim speed, a difficulty inflation, parachutal tendencies, etc.

  • 10mm of tolerance (overall length of each line, under a tension force of 5Kg)


A complete visual inspection should be carried out, preferably using a light table to be able to highlight easily any damage. This will also help to point out any possible changes in the coating of the cloth. All the components of the wing should be checked: panels, stitching, ribs, diagonals, line attachment points, tabs, etc.

We should make sure that there aren’t any holes, tears, damaged or loose stitching, and if found, they should be repaired accordingly. Large areas of damage will need replacement panels. Complex or large scale damages, especially to the ribs or that seriously affect the structure, may require a factory repair. Please consult us if you’re not sure.

Test de Porosidad


The cloth’s strength is the most important factor when determining the airworthiness of the canopy. It’s possible that a cloth with a very low porosity rate (below 15 seconds) to be perfectly airworthy so long as the tear strength is over the minimum acceptable values. On the contrary, a fabric that doesn’t pass the tear strength test won’t be considered suitable for flying, irrespective of the porosity value. The tear resistance of the cloth is measured with a Bettsometer (B.M.A.A. patent number GB 2270768 Clive Betts Sails).

Puncture the cloth in the middle of a panel from the middle of the top surface and increase the load until 600 g is achieved. If the fabric tears more than 5 mm before reaching such weight, it should be considered too weak and the glider is un-airworthy. We shall repeat this procedure on a panel of the undersurface.

  • 600 g with a tear of >5 mm is the lowest accepted value


The canopy’s porosity values should be measured in several different points of the top and bottom surface. We recommend 18 measurements on the top surface and 6 on the undersurface. Measurements should be taken approximately 20-30 cm inboard from the leading edge in the approximate positions indicated in the diagram below using a porosity meter, a special instrument that times a certain air volume passing through the material.

Test porosidad

For minimum acceptable values it’s important to measure along with the tear strength. For example, low values such as 15 seconds but witj good, strong tear resistance may not pose a problem.

The lowest accepted average value for the top and/or bottom surface depends also on the tear strength test results:

  • – 600 g/5 mm = Consult with the maker. Requires professional test flight for confirmation


Check the lengths and that the risers are in visually good condition with no abrasion damage, and pay particular attention to the maillon hang loops and the main suspension loop. Ensure that all maillons are undamaged and are done up correctly. Replace any missing rubber O rings.


Finally a flight test confirms that the wing behaves normally.

IMPORTANT: Take care of your glider and make sure you have it checked according to the above schedule by a qualified and experienced technician: This will ensure you hours of safe flying.




These are the services that we offer:

Single seat glider Porosity Test   35 €
Two-seated glider Porosity Test   50 €
Visual Inspection with Detected Damage Diagram   30 €
PDA Parachute Folding   30 €
Rogallo Parachute Folding   45 €
Parachute installation   10 €
Line Confection (with or without cover)   10 €
Partial Line Stretching (C and D lines)   45 €
Trim and Symmetry Check   65 €
Seat Cleaning   20 €
Overall Line Set Replacement   80 €
Line Replacement (per unit)   2 €
Simple Tear and Hole Repairing (up to 20 cm)   8 €
Cloth Strength Test   10 €
Carburization Set-up   20 €
General Set-up and Inspection   90 €
Engine Decarbonizing and Gasket Changing   60 €
Worn or Damaged Screw Repairing – helicoil   20 €
Worn or Damaged Screw Thread Coils Repairing – helicoil   25 €
Armored Propeller Tips   20 €
Propeller Tracking   15 €
Oil Change   15 €
Cylinder or Cylinder Head Rectification   To be consulted
Repairing or Replacement of Engine Pieces   To be consulted

Contact us and make an appointment


Only 5€!!!!!!

If you’re from outside of Madrid and it’s complicated to bring your glider to us in person, we suggest you to send it to us with KIALA, a low-cost delivery service that will send your canopy for only 4.99€. Register on-line and send us your delivery to the KIALA’s collecting point at ‘Mejorada del Campo’ (Madrid) to Alberto Martín González, requiring a notice e-mail to madparapente@hotmail.com

We recommend you to fold your wing tightly without any box, simply put it inside its bag with seal and wrapping film, like in the airports. This way you won’t exceed the delivery service’s dimension requirements (8 Kg and 65 cm X 40 cm X 40 cm).

SALE OFFER: If you apply for a complete canopy inspection (porosity test + line set strength test + inspection and damage diagram + cloth tear test), we’ll cover the delivery costs or make an equivalent discount. Price of complete inspection is 120€ (or 110€ if you bring it).


Repair or overhaul

Fill in the form below if you need some kind of repair or overhaul your team flight



Telephone number*


Identification number / or passport number



Any question?*

I accept the Privacy Policy