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1. General
The DA 40 has a fixed tricycle landing gear and a castering nose wheel. This Section gives you the
general description and operation of the landing gear. See Section 32-10 for trouble shooting and
maintenance practices for the main gear. See Section 32-20 for trouble shooting and maintenance
practices for the nose gear. See Section 32-40 for trouble shooting and maintenance practices for the
for the wheels and brakes.
Note: Equipment which is certified for installation in the DA 40 is listed in Section 6.5 of
the Airplane Flight Manual. Such equipment may be installed in accordance with
the Airplane Maintenance Manual.
Any equipment which is not listed in Section 6.5 of the Airplane Flight Manual is
called "Additional Equipment". The installation of Additional Equipment is a
modification which must be handled in accordance with national regulations or a
Service Bulletin.
2. Description and Operation
Flat section steel leaf-springs make the main gear struts. Two mountings attach each main gear strut
to the center section of the fuselage. The bottom of each strut has an axle, a brake torque plate and
a mounting plate for the GFRP wheel fairing.
The nose gear is a tubular strut. A strong pivot attaches it to the forward fuselage. An elastomer spring
pack (elastomer pack) attaches the strut to the engine mount. A pivot at the bottom of the strut has a
trailing fork for the wheel. It also holds the GFRP wheel fairing.
Both nose and main gear have single wheels with low pressure tires. Each main gear strut has a disk
brake. Toe-brake pedals on the rudder pedals operate the disk brakes. A parking brake valve allows
the brakes to be set ON for parking.
The landing gear absorbs vertical loads (for example, landing loads). Each main gear strut is a leafspring
which deflects upwards as the load increases. The elastomer pack in the nose gear
compresses as the load increases. In each case, the spring returns to the original position when the
load is removed.
Push on both toe-brake pedals at the same time to apply both disk brakes. The airplane will stop in
a straight line.
Push on one toe-brake pedal to apply the disk brake on that side only. The airplane will steer to that
side.
Move the parking brake lever fully up. Then push on both toe-brake pedals a few times to apply the
parking brake. Move the parking brake lever fully down to release the parking brake.
AIRCRAFT
Landing Gear
DA 40 Series
AMM
Page 2
20 Sep 2007 32-00-00 Doc # 6.02.01
Rev. 5
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AIRCRAFT
DA 40 Series
AMM
Landing Gear
Doc # 6.02.01
Rev. 5 32-10-00 Page 1
20 Sep 2007
Section 32-10
Main Landing Gear
1. General
This section gives you the data for the main landing gear. It gives you the trouble-shooting and
maintenance practices. Refer to Section 32-40 for data for the main wheels and the brakes.
2. Description and Operation
Figure 1 shows the main gear strut mounting. Each main gear strut is a steel alloy leaf spring. Two
strong mounts attach each spring to the center section of the fuselage. Small panels with flexible
centers seal the gaps where each strut goes through the fuselage shell.
The inner mount is a large vertical bolt. The bolt goes through a metal block which attaches to the
center closing rib of the fuselage center section. Spring washers separate the top face of the spring
from the block. A convex and a concave washer separate the bottom face of the spring from a castle
nut. The castle-nut pre-loads the spring washers.
The outer mount has 2 parts. The upper part locates on top of the main strut and the lower retaining
bar locates below the main strut. Two bolts attach the assembly to the main landing gear rib. The main
landing gear rib is bonded into the fuselage center section. Reinforced synthetic rubber inserts go
between the leaf spring and the retaining bar to prevent chafing damage and allow angular movement
of the leaf spring in the mount.
Figure 2 shows the main landing gear axle installation. Six bolts at the outer end of each strut attach
these components:
) An axle, made from steel or aluminum (refer to MÄM 40-083)
) A brake torque-plate.
) A mounting plate for the GFRP wheel fairing.
When the airplane is on the ground, the inner end of the leaf spring pulls down on the inner mounting.
The outer end pushes up against the outer mounting. When the airplane is flying, the inner end of the
leaf spring pushes up on the inner mounting. And the outer end pulls down against the retaining bar
of the outer mounting.
AIRCRAFT
Landing Gear
DA 40 Series
AMM
Page 2
　
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