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1. General
This Section gives you the data for the nose landing gear. It gives you the trouble-shooting and
maintenance practices. Refer to Section 32-40 for the data for the nose wheel.
2. Description and Operation
Figure 1 shows the nose landing gear installation. The DA 40 has a fixed nose landing gear with a
castering wheel. The nose landing gear strut is a welded tubular-steel component. The aft upper end
has a transverse tube which holds the main attachment journal bearings. These journal bearings allow
the strut to move only up and down.
Forward and below the attachment bearing is a welded bracket which holds the bottom of an
elastomeric spring pack (elastomer pack). The upper end of the elastomer pack attaches to the engine
mount.
The forward bottom end of the nose landing gear strut has a near vertical pivot for the nose-wheel fork.
This lets the nose wheel castor. Stops limit the castor movement to ±30°.
When the airplane is on the ground, the elastomer pack pushes up against the engine mount. The
journal bearings pull down against the front fuselage. When the airplane is flying, the elastomer pack
pulls down against the engine mount. And the journal bearing pushes up against the front fuselage.
The journal bearings in the fuselage keep the nose landing gear strut aligned fore and aft. A side load
on the nose wheel causes it to castor. The stiffness (steering friction) of the nose-wheel fork pivot can
be adjusted with the nose wheel fork mounting screw. This prevents nose wheel shimmy.
AIRCRAFT
Landing Gear
DA 40 Series
AMM
Page 2
20 Sep 2007 32-20-00 Doc # 6.02.01
Rev. 5
Nose Wheel Fork
Nose Wheel Axle
Castor Stop
Nose Gear Leg
Tubular Strut
Elastomer Pack
Journal Bearings
Lock Bolt
Figure 1: Nose Landing Gear
AIRCRAFT
DA 40 Series
AMM
Landing Gear
Doc # 6.02.01
Rev. 5 32-20-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
Use the data below to trouble-shoot the nose landing gear.
WARNING: YOU MUST DO A HARD LANDING CHECK AFTER A HARD LANDING.
HARD LANDINGS CAN CAUSE DAMAGE TO THE STRUCTURE AS
WELL AS THE LANDING GEAR.
Trouble Possible Cause Repair
Strut bent. Hard landing. Do a hard landing check. Refer
to Section 05-50.
Replace the strut.
Nose wheel shimmy. Steering friction too low. Adjust the nose wheel fork
mounting screw.
AIRCRAFT
Landing Gear
DA 40 Series
AMM
Page 102
20 Sep 2007 32-20-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Landing Gear
Doc # 6.02.01
Rev. 5 32-20-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
These maintenance practices tell you how to remove, install and adjust the nose landing gear. Refer
to the manufacturer for further data.
2. Remove/Install the Nose Landing Gear Strut
A. Equipment
Item Quantity Part Number
Padded trestles 1 Commercial.
Weight and strap 1 Commercial.
B. Remove the Nose Landing Gear Strut
Detail Steps/Work Items Key Items
(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 gear mounting.
(3) Remove the engine cowling. Refer to Section 71-10 or 71-11.
(4) Remove the strut fairing (if installed):
S Remove the bolts, nuts and washers at the
trailing edge.
S Remove the bolts, nuts and washers from the
support bracket at the forward bottom side of
the cover.
S Move the strut fairing clear of the airplane.
Optional, see OÄM 40-105.
(5) Disconnect the elastomer pack from the engine
mount.
Refer to Figure 1.
(6) Remove the lock bolt from the journal bearing. Refer to Figure 1.
(7) Compress the journal bearing unit inwards.
(8) Release the journal bearing unit from the fuselage
bearings.
AIRCRAFT
Landing Gear
DA 40 Series
AMM
Detail Steps/Work Items Key Items
Page 202
20 Sep 2007 32-20-00 Doc # 6.02.01
Rev. 5
Bolt
Washer
Bearing
Plate
Elastomer
Pack
Elastomer
Element
Eye-end
Adjusting Nut
Top
End Cap
Trunnion
Center
Tube
Bearing
Bottom
End Cap
Small Elastomer Element
Large Washer
Washer
Nut Spacer
Plate
(9) Remove the nose gear strut from the airplane in a
downward direction.
Figure 2: Elastomer Pack and Journal Assembly
AIRCRAFT
DA 40 Series
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本文链接地址：
钻石40系列AMM 2(55)
