APCO Aviation NRG Pro II, Manual

Page: 20 / 43

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20
3 ANNUAL / PERIODICAL AIRWORTHINESS INSPECTION
It is highly recommended that your glider (and other equipment), undergo a Periodical
Airworthiness Inspection which is to be done by Apco, or an Apco approved / appointed service
centre.
This is recommended to be done every 24 months or every 100 hours, whichever comes first.
This recommendation is in line with Israeli regulations, binding in Israel. as an alternative, we
suggest for you to follow the regulations set by your national authorities.
POROSITY:
Porosity is measured with a calibrated Porosimeter. It should be measured in at least 5 different
places on the upper surface. Below is an example of the sections we test at Apco. The upper
surface, at 20-35% chord (from L/E) is most prone to becoming porous, and is thus the most
important section to test. It is also important to test the different cloth types, and different colours
used.
LINE MAINTENANCE
Superaramide lines are known to be sensitive to the influence of the elements. They must be
carefully inspected periodically. In his/her own interest, the pilot must observe the following
points to ensure maximum performance and safety from the glider. Avoid sharp bending and
squeezing of lines. Take care that people do not step on the lines. Do not pull on the lines if they
are caught on rocks or vegetation. Avoid getting the lines wet. If they do get wet, dry them as
soon as possible at room temperature and never store them wet.
One line of each line group (a, b, c, upper and lower) must be tested for minimum 50% of the
rated strength. if the line fails under the load test or does not return to its specified length all the
corresponding lines must be replaced. never replace lines with different diameter or type of lines
as all gliders were flight and load tested for safety in their original configuration. Changing line
diameter/strengths can have dangerous / fatal consequences.
Professional use of gliders: towing, tandem, schooling and competition flying requires more
frequent line inspection and replacement of A, B, C, D and brake lines.
For replacement lines
please refer to our online direct line services.