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to the inboard trailing edge. An aileron attaches to the outboard trailing edge.
The wings have a monocoque structure. Each wing has top and bottom shells. The shells have CFRP
outer skins, a rigid foam core and GFRP inner skins. Each wing has two I-section spars. Unidirectional
carbon fiber cloth makes the spar caps. Each wing also has GFRP ribs and webs.
The flaps and ailerons have a mixture of CFRP and GFRP cloth in the shells. The shells have rigid
foam cores.
This Chapter gives the repair data about the layers of cloth used in the structure of the wings flaps and
ailerons. Refer to Chapter 51 for general composite repair data. Refer to Chapter 27 for data about
the control systems which operate the flaps and ailerons.
AIRCRAFT
Wings DA 40 Series
AMM
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20 Sep 2007 57-00-00 Doc # 6.02.01
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AIRCRAFT
DA 40 Series
AMM
Wings
Doc # 6.02.01
Rev. 5 57-10-00 Page 1
20 Sep 2007
Section 57-10
Wing Structure
1. General
This Section gives you the data about the structure of the wings. Refer to Section 57-50 for data about
the structure of the flaps. Refer to Section 57-60 for data about the structure of the ailerons.
AIRCRAFT
Wings DA 40 Series
AMM
Page 2
20 Sep 2007 57-10-00 Doc # 6.02.01
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% Figure 1: Wing Structure
AIRCRAFT
DA 40 Series
AMM
Wings
Doc # 6.02.01
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20 Sep 2007
2. Description
Figure 1 shows the wing structure. The wing has top and bottom shells. It has front and rear spars and
a root rib made in three parts. Four ribs hold the fuel tanks between the spars. Flap and aileron control
ribs hold the bellcranks for the control systems.
A rear web closes the trailing edge of the wing. An end rib closes the outboard end of the wing. A
removable GFRP tip attaches to the wing shells and outer rib with screws.
Bonding paste (thickened resin) bonds the wing components to each other. The following section gives
more data about the main parts:
A. Wing Shells
Each wing has top and bottom shells. Each shell has a CFRP outer skin, a rigid foam core and a
GFRP inner skin. The fibers in the layers of cloth which cover the whole wing run at ±45° to the
lateral axis of the wing. The outer layer is carbon fiber. The inner layer is glass fiber.
Some areas have more layers of cloth to give more strength. For example, the area around each
access hole has extra layers of carbon fiber cloth.
The bottom shell of each wing has seven access holes. These give access to the flap and aileron
bellcranks and fuel tanks. The top shell has a hole for the fuel cap of the outer fuel tank.
B. Spars
Each wing has two I-section spars. The front spar on one side is the same as the rear spar on the
opposite side.
Many layers of uni-directional carbon fiber make the spar caps. The number of layers in the spar
caps decreases from root to tip.
Each spar has a shear web. The shear web has GFRP skins and a rigid foam core. Glass cloth
fillets attach the spar caps to the shear web.
The inboard end of each spar (the ‘stub’) goes past the root rib. The spar stub is a box-section with
many layers of glass cloth wrapped round the spar caps. Two large bushes bond into the spar stub.
The wing main bolts engage these bushes and attach the wing to the fuselage center section. The
bushes and bolts transmit the wing bending loads into the center section. Figure 3 shows the main
bolt installation.
AIRCRAFT
Wings DA 40 Series
AMM
Page 4
20 Sep 2007 57-10-00 Doc # 6.02.01
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C. Root Rib
Each wing has a three-piece root rib. Each piece is a GFRP molding with many layers of glass fiber
cloth. The front root rib bonds to the top and bottom shells and the front face of the front spar. It has
a housing for the A-bolt. The A-bolt transmits lift loads into the center section.
The middle part of the root rib bonds to the top and bottom shells, the aft face of the front spar and
the front face of the rear spar. It has a large oval access panel for removing the fuel tanks.
The rear root rib bonds to the top and bottom shells, the aft face of the rear spar and the rear web.
It has a housing for the B-bolt. The B-bolt transmits lift loads into the center section. It also has
guide rollers for the flap and aileron push rods.
D. Fuel Tank Ribs
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