09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
123
WING INSTALLATION
Please read the entire section before you continue with Wing Installation.
We recommend having all assemblies and installations related to the Wing
completed before the Wings are final installed to the airplane. It is NOT necessary
to trial-fit the Wings to the Fuselage at an earlier assembly stage.
The following items should be completed at this stage:
❑
Final check of all rivets, hardware, safety wire. Make sure all rivets in the skins
have been pulled. If any mandrels are sticking out they must be filed off.
❑
Wing tips finished, but removed for wing install.
❑
Wings are painted.
❑
Fuel Sight Gauges installed to Wing root.
❑
Lift struts assembled.
❑
Strut attach tangs on the fuselage are drilled to 7/16".
❑
Wing truss to Strut truss fitting bolts are loose.
❑
FWD Spar to Fuselage mounting holes drilled
to 3/8” thru spar.
❑
5/16” bolt (head side inboard), at top of Station 3, installed with washer on both
sides.
It is recommended to hang both Wings at the same time (one at a time). You will need
at least one helper. However, it is more comfortable to have two helpers.
1.
Set the wing on saw horses next to the fuselage so that it can be lifted straight up
and into place.
2.
Follow the following procedures to trim the T-bone on the Fuselage to fit the
wing:
a)
On the wing, Measure from the AFT side of the Forward Spar to the center
of the 5/16" bolt hole on the aft attach fitting.
b)
Add 3/8" to measurement to account for Forward Spar and doubler.
c)
On the fuselage, measure from the centerline of the hole for the 5/16" bolt
on the AFT attach fitting to the AFT side of the T-bone. Mark the distance
previously measured plus the 3/8" allowance.
d)
Cut the bushing to the mark. Keep as square as possible.
e)
Measure the inside distance of the Forward Spar.
f)
Mark this measurement from the AFT side of the T-bone to the forward
side.
