
North&Wing&S,LSA&Maintenance&Manual&
Model:&Sport&X2&582&
Issue 3.2
Printed: July 16 2017
Page 34
1.
!
Check for proper wing assembly. i.e. no cable routing problems, nose cable is not
twisted at swan hook, nose cone is secure in place, sprogs are in place
2.
!
Assure the crossbar setup cable in not caught or riding on the pivot block
3.
!
Assure that all ribs are secured and have reasonable tension in the trailing edge rib
strings. If a rib string is loose for no apparent reason, check to see if the rib has
punctured and pushed through the rib pocket at the leading edge. This will cause a
loose rib and a turning problem.
4.
!
Match all ribs to the rib blueprint provided with your wing. Correct any deviations
unless they were changed as a result of prior successful tuning.
5.
!
Check the leading edges to assure they are not bent. If so, they must be replaced.
Once these checks are completed, and wing handling or performance problems persist, then
proceed with the following diagnostics.
A few basic rules of wing tuning are listed here:
1.
!
Make only small adjustments until the effect of those changes is determined by test
flying.
2.
!
Never change more than one adjustment at a time without testing the result of that
adjustment.
3.
!
Upon completion of making any adjustments, test fly the trike about a foot off the
ground for the length of the runway at least three times before climbing to altitude to
assure no adverse characteristics have been introduced.
4.
!
Record all changes in your wing maintenance log
There are six basic types of adjustments that an owner is authorized to make to tune his wing
handling:
1.
!
Sail tension from front to rear at selective locations (rib positions)
2.
!
Sail tension along the leading edge
3.
!
Selective rib re-shaping
4.
!
Twist (or washout) along the span of the wing
5.
!
Cross bar pull back adjustment
6.
!
Hang block location (CG adjustment)
Each of these adjustments has a different affect on the performance and handling of the wing.
Table 4.2-1: Wing Tuning Diagnostics, provides a diagnostic procedure if your wing
performance needs corrections. The “1
st
Adjustment” column is the recommended first
corrective action. If the problem persists, the “2
nd
Adjustment” can be made. The code
letters in the columns refer to the list of Corrective Adjustments in the following Table 4.2-2:
Wing Corrective Adjustments. If neither of these two adjustments correct the problem,
contact a North Wing dealer.