TECHNICAL DESCRIPTION, OPERATING, MAINTENANCE AND REPAIR MANUAL
3.9.2 Necessary maintenance tools
No special tools are needed for WT-9 Dynamic maintenance. The manufacturer
recommends using of the suitable piercer for dismantling of the nose wheel axle.
3.9.3 Inspection holes
There are not use the special inspection holes for an access into the airframe on the
ground of preservation of the smooth aeroplane surface. There is an inspection window
blinded by transparent acryl glass on the wing lower surface for the inspection of the
aileron two-arm lever. After opening of this small window and the finishing of the works
glue it by means of a pure silicon glue again.
The control elements are accessed after the pedestal cover demounting and the rear frame
cover demounting behind the baggage compartment.
3.10 Brake system
3.10.1 Brake plate replacement
The brake plate replacement is performed when a plate is worn-out. Apply the following
procedure to brake plate replacement:
1. Jack the aeroplane
2. Remove the cotter pin, unscrew the M22 main wheel axle nut, remove washer from
the wheel axle.
3. Bend small tabs on 3 washers and unscrew screws connecting brake disc to the rim..
4. Remove the wheel and a distance ring from the axle.
5. Take the brake disc down ( leave the brake on a main leg ).
6. Remove the cotter pins, shift the pins out and remove the brake plates.
7. Mount a new brake plates, secure the pins with cotter pins ( diameter 2 mm, length
14 mm ).
8. Put the brake disc on the wheel.
9. Put the distance ring on the axle and then the wheel ( adjust the distance ring between
bearings ).
10. Set tab washers on the screws, apply a Loctite and screw the brake disc to the inner
part of a rim, bend the tabs of washers to secure screw heads.
11. Put the washer on the axle, screw main wheel axle nut back and secure with a cotter
pin.
List of parts necessary for Brake plate replacement procedure:
1. Brake plates 4 pcs
2. Cotter pins φ2 x 14 4 pcs
3. Cotter pins φ4 x 40 2 pcs
4. Secure Tab washers 6x2 6 pcs
5. LOCTITE ( blue ) to secure the screw heads
Date: 01.03.2002 WT-9 Dynamic Section 3 Page 3 - 18
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