Diamond DA20-C1 Maintenance Manual page 116

Wings
C. Root Rib
The root rib has a forward part and an aft part. Both parts are rigid GFRP moldings with many
layers of glass cloth. Many layers of glass cloth bond both parts of the root rib to the spar.
The forward root rib has a bearing housing for the A-bolt. The A-bolt is a small distance in front of
the spar. The A-bolt transmits lift loads into the fuselage structure.
The aft part of the root rib has a bearing housing for the B-bolt. The B-bolt transmits some lift loads
and lateral loads into the fuselage structure.
D. Aft Inner Web
The Aft Inner Web closes the rear of the wing in front of the flap. It is a rigid GFRP molding. Three
rigid GFRP inserts in the web make mountings for the flap hinge brackets. The web goes from the
root rib to the outer end of the flap.
E. Aft Outer Web
The Aft Outer Web closes the rear of the wing in front of the aileron. It is a rigid GFRP molding.
Three rigid GFRP inserts in the web make mountings for the aileron hinge brackets. The web goes
from the outer end of the flap to the outer end of the aileron.
F. Flap Control Support Rib
This small rib is close to the root rib. It is a rigid GFRP molding. It has a guide bearing for the flap
control rod.
G. Flap Control Rib
The flap control rib is located half way along the aft inner web. It is a rigid GFRP molding with an
insert. It has the mounting for the flap control bellcrank. It bonds to the aft face of the spar, the top
and bottom shells and the aft inner web. It has a guide bearing for the aileron control rod.
H. Center Rib
The center rib is located half way along the wing. It is a rigid GFRP molding. It has a guide bearing
for the aileron control rod. It bonds to the aft face of the spar, the top and bottom shells and the aft
inner web.
I. Aileron Control Rib
The aileron control rib is located half way along the aft outer web. It is a rigid GFRP molding with an
insert. It has the mounting for the aileron control bellcrank. It bonds to the aft face of the spar, the
top and bottom shells and the aft outer web.
J. Aileron Mass Balance Rib
The aileron mass balance rib makes a cut-out for the aileron mass balance at the outboard end of
the aft rear web. It is a rigid GFRP molding.
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30 Oct 09
57-10-00
DA20-C1 AMM
DA201-C1
Rev 16