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(5) Install the elastomer pack in the airplane. Refer to Paragraph 3.
5. Adjust the Nose Wheel Steering Friction
Steering friction prevents nose wheel shimmy.
A. Equipment
Item Quantity Reference
Padded trestle. 1 Commercial.
Weight and strap. 1 Commercial.
Spring balance 1 Commercial.
AIRCRAFT
DA 40 Series
AMM
Landing Gear
Doc # 6.02.01
Rev. 5 32-20-00 Page 207
20 Sep 2007
B. Procedure
Detail Steps/Work Items Key Items/References
(1) Use weights to hold the rear fuselage down with
the nose wheel clear of the ground.
Use a strap around the fuselage.
(2) Put a padded trestle under the front fuselage just
aft of the nose wheel mounting.
(3) Remove the nose wheel fairing.
(4) Adjust the nose wheel fork pivot nut. The nose-wheel must just castor when
you apply a force of 30-50 N (6.75 -
11.25 lb) acting in the direction of the
nose wheel axle. If the cotter pin hole
does not align, tighten the nut to the
next slot.
Refer to Figure 3.
(5) Apply corrosion protection to the nut, stud and
washers only.
Use CRC corrosion shell.
Do not get CRC corrosion shell on the
tire or the fiberglass.
(6) Install the nose-wheel fairing.
(7) Remove the trestle from the front fuselage.
(8) Lower the nose-wheel to the floor. Remove the weights from the rear
fuselage.
6. Nose Wheel Balancing
Always have the nose-wheel balanced before installation.
AIRCRAFT
Landing Gear
DA 40 Series
AMM
Page 208
20 Sep 2007 32-20-00 Doc # 6.02.01
Rev. 5
Pivot Nut
Apply a Force of
30 - 50 N (6.75 - 11.25 lb.)
in both Directions along
the Line of the Axle
Figure 3: Adjust the Nose Wheel Steering Friction
AIRCRAFT
DA 40 Series
AMM
Landing Gear
Doc # 6.02.01
Rev. 5 32-40-00 Page 1
20 Sep 2007
Section 32-40
Wheels and Brakes
1. General
This section gives you the data for the main and nose wheels. It also gives you the data for the brake
system. And it gives you the trouble-shooting and maintenance practices.
2. Description and Operation
A. Main Wheel
Figure 1 shows the wheels. The main wheel hub has 2 aluminum alloy halves. Three bolts hold the
2 halves together. The bolts also hold a brake disk to the inner half of the hub.
The wheel has a tire with an inner tube. Snap rings hold taper roller bearings and grease seals in
each half of the hub. You can remove the bearings for maintenance. The outer half of the hub has
a hole for the valve stem.
B. Nose Wheel
The nose wheel has a similar construction to the main wheel but it has tapered bearings.
AIRCRAFT
Landing Gear
DA 40 Series
AMM
Page 2
20 Sep 2007 32-40-00 Doc # 6.02.01
Rev. 5
Snap Ring
Seals
Bearing
Tire
Inner Tube
Hub
(2 Halves)
Brake Disk
Bolt
Bolt
Hub Half
Hub Half
Tire Inner Tube
Tapered Bearing
NOSE WHEEL
MAIN WHEEL
Figure 1: Main and Nose Wheels
AIRCRAFT
DA 40 Series
AMM
Landing Gear
Doc # 6.02.01
Rev. 5 32-40-00 Page 3
20 Sep 2007
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Figure 2: Brake System Schematic
AIRCRAFT
Landing Gear
DA 40 Series
AMM
Page 4
20 Sep 2007 32-40-00 Doc # 6.02.01
Rev. 5
C. Brake System
Figure 2 shows the brake system schematic diagram. The DA 40 has 2 separate brake systems.
The pilot’s and co-pilot’s left toe brake pedals operate the left system. They supply pressure to the
left brake caliper. The right toe brake pedals operate the right brake system and supply pressure
to the right caliper.
Figure 3 shows the brake master cylinder and reservoir installation. Each system has a brake fluid
reservoir. The reservoir attaches to the master cylinder on the co-pilot’s rudder pedal. The outlet
from the master cylinder on the co-pilot’s rudder pedal connects to the inlet of the master cylinder
on the pilot’s pedals. The outlet from the master cylinder on the pilot’s rudder pedal connects to the
parking brake valve. The parking brake valve connects to the brake caliper.
Figure 4 shows the wheel brake assembly.
Figure 5 shows the parking brake valve installation. The parking brake valve is located on the
bottom flange of the control bulkhead. It contains 2 valves which can seal the brake pressure into
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