09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
77
LIFT STRUT ASSEMBLY
1.
The Lift Struts are cut to length and the attach holes pre-drilled at the factory.
Smooth the ends of each Lift Strut with fine sand paper and debur.
2.
Mark a straight line between the attach holes at either end of the strut. Use a
straight edge or a piece of string. Only marking inside the holes by 8" or so is
needed.
3.
Place a strut doubler on the strut with a bolt in the attach hole. Align the rest of
the holes with the line on the strut. Transfer drill the #30 holes from the doubler to
the strut. Cleco the first hole to hold the doubler in place before continuing to drill.
4.
Repeat for the remaining 3 strut doubler plates.
5.
Slide the Strut Fitting Doublers inside the ends of the strut and cleco in place.
Drill the #30 holes out to #11. Rivet the doublers to the strut using the
appropriate rivets.
6.
Use a 7/16” drill to drill the bolt holes out to final size on the strut/doublers and
the strut attach tangs on the cage.
7.
The lower strut fitting can be bolted to the bottom of the strut. The side with the
generous radius is bolted to the tangs on the cage. Leave the bolt loose enough
that the lower attach fitting can swivel freely.
NOTE:
The welds between the strut tangs may prevent the fitting from
sliding all the way in. Use a file or sander to radius the corner on the lower
strut attach fitting just enough to allow it to be inserted until the bolt holes
line up.
8.
Set the struts aside until final assembly of the airframe.
