WT9 Dynamic LSA. AIRCRAFT MAINTENANCE MANUAL (AS-AMM-01-000, 22. 05. 2017)

Effectivity:

ALL

04. 07. 2019

LANDING GEAR

(2) Nose wheel bearings replacement:

(a) Remove the wheel (Chapter 32-20).

(b) Deflate the tire to zero pressure.

(d) Unscrew the bolts (4) and disassemble the discs (2; 3).

(e) Remove the O-ring (5).

(f)

Use Circlip pliers to remove the circlips (7) and pull out the bearings
(6).

(g) Slide in the new bearings (6) and secure with circlips (7).

(h) Install the tire (see 2.B.(1)).

– Tire

– Bearing

– Disc 1

– Circlip

– Disc 2

– Bearing

– Allen bolt M8 x 70

– Circlip

– O-ring

Fig. 32-16 Nose Wheel

WHEELS AND BRAKES

LANDING GEAR

Brake system

Type of maintenance:

Line

Personnel qualification:

Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Wrench 12

1 pc

Wrench 10

1 pc

Socket set 14

1 pc

Screwdriver 5

1 pc

Hex key 4

1 pc

Hex key 5

1 pc

Hex key 6

1 pc

Pliers

1 pc

Serrated locking washer

ø6.4 mm

2 pcs

Copper gasket ring

ø10 x 15 x 1.5 mm

8 pcs

Vaseline

Sealing adhesive tape

Persons

Beringer documentation - Assembly instructions for hose and
banjo fittings

Tab. 32-12 Recommended tools, materials, persons and documentation

(1) Brake fluid reservoir removal:

(a) Drain the brake fluid from the brake system (see 2.C.(12)).

(b) Remove the left laminated seat (Chapter 25-10).

(39), remove the washer (37) and nut (33).

(d) Remove the hose clamp (35) and remove the brake fluid reservoir (1).

Effectivity:

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12. 06. 2020

LANDING GEAR

(2) Brake fluid reservoir installation:

(a) Connect the fluid reservoir (1, Fig. 32-17) with the hose (14) and

secure with the hose clamp (35).

(b) Install the fluid reservoir (1) using the bolt (39) with the washer (37)

and nut (33) on the reservoir holder (38).

(d) Install the left laminated seat (Chapter 25-10).

(e) Carry out a test and check:

•

If all bolt connections are tight.

•

Tightness of the brake system.

•

That no foreign objects remain in the aircraft.

WHEELS AND BRAKES

LANDING GEAR

– Brake fluid reservoir 15 – Brake hose R

– Washer ø6.4x18x1.6

– Master cylinder

assembly

– Brake hose L

– Washer ø5.3 x 15 x 1.2

– Master cylinder

– Connecting brake hose

– Washer ø6.4x12x1.6

– Swivel bearing

– Holder ø75

– Washer ø6.4x10x1.6

– Thread rod M6 x 40

– Holder ø70

– Self-locking nut M6

– Fork with safety pin 20 – Rubber

– Self-locking nut M5

– Nut M6

– Double banjo bolt M10 35 – Hose clamp

– Serrated locking

washer ø6.4

– Banjo bolt M10

– Spiral hose ø8

– Brake lever

– Banjo fitting

– Washer ø6.4x12x0.5

– Pressure limiter

– Copper gasket ring

ø10 x 15 x 1.5

– Reservoir holder

– Caliper

– Bolt M6x22

– Bolt M6 x 12

– Bracket

– Bolt M6x25

– Washer ø5.3 x 10 x 1

– Bracket

– Pin ø6 x 14

– Split pin ø1.6 x 25

– Hose

– Allen bolt M6 x 16

– Bleeding screw

Fig. 32-17 Brake System Components Removal / Installation

Effectivity:

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12. 06. 2020

LANDING GEAR

(3) Master cylinder assembly with brake lever removal:

(a) Drain the brake fluid from the brake system (see 2.C.(12)).

(b) Remove the pedestal panel (Chapter 27-50).

(d) Remove the elevator push rod in the central tunnel (Chapter 27-30).

(e) Remove the hose clamp (35, Fig. 32-17) and the hose (14).

(f)

Disconnect the brake hoses (15; 17) by removing the banjo bolt (21)
and the gasket rings (24).

(g) Disconnect the brake lever (9) from the fork (6), by removing

the safety pin.

(h) Remove the master cylinder assembly (2) with the bracket (13),

by removing the nuts (33), washers (29) and bolts (25).

(i)

Remove the bracket (13), by removing the nut (33), washers (31; 32)
and bolt (26).

(j)

Disassemble the master cylinder assembly (2):

•

Unscrew the thread rod (5) with the fork (6).

•

Unscrew the swivel bearing (4).

(k) Remove the bracket (12) with the brake lever (9) by removing

the nuts (33), washers (29) and bolts (25).

(l)

Remove the brake lever (9), by removing the split pin (41), washer (40)
and bolt (27).

(4) Master cylinder assembly with brake lever installation:

(a) Connect the bracket (12, Fig. 32-17) with the brake lever (9), using bolt

(27), washer (40) and split pin (41).

CAUTION

DO NOT FORGET TO LUBRICATE THE ROTATING POINTS
OF THE BRAKE LEVER.

(b) If necessary, assemble the master cylinder assembly (2):

•

Screw the swivel bearing (4) with the washer (8) almost fully in and

tighten the lock nut (7).

•

Screw the thread rod (5) with the fork (6), washer (8) and lock nut

(7) in; do not tighten yet.

washers (31; 32) and nut (33).

(d) Install the whole unit (13; 2) into the central tunnel using bolts (25),

washers (29) and nuts (33).

(e) Enclose the central console and adjust the length of the thread rod (5)

so that the brake lever is fully unloaded (front position) and the master
cylinder (2) is not pushed.

(f)

Remove the central console, secure the fork (6) with the safety pin and
tighten the lock nut (7).

WHEELS AND BRAKES

LANDING GEAR

(g) Assemble the brake hoses (15; 17) with banjo fittings (23)

(see 2.C.(10)).

(h) Connect the brake hoses (15; 17) with the master cylinder (3), using

banjo bolt (21) and gasket rings (24).

CAUTION

A NEW GASKET RINGS MUST BE INSTALLED AT EACH
MASTER CYLINDER ASSEMBLY.

(i)

Connect the hose (14) with the master cylinder (3) and secure
with hose clamp (35).

(j)

Fill the brake system with the brake fluid (see 2.C.(12)).

(k) Install the elevator push rod in the central tunnel (Chapter 27-30).

(l)

Install the left laminated seat (Chapter 25-10).

(m) Install the pedestal panel (Chapter 27-50).

(n) Carry out a test and check:

•

If all bolt connections are tight.

•

Tightness of the brake system.

•

That no foreign objects remain in the aircraft.

(5) Pressure limiter removal:

(a) Drain the brake fluid from the brake system (see 2.C.(12)).

(b) Remove the pedestal panel (Chapter 27-50).

(d) Disconnect the hoses (16; 17, Fig. 32-17) by removing the banjo bolt

(21) and gasket rings (24).

(e) Remove the pressure limiter (10) by removing the nuts (34) and

washers (30).

(f)

Remove the holders (18; 19) and rubbers (20).

(6) Pressure limiter installation:

(a) Install the rubbers (20, Fig. 32-17) and the holders (18; 19)

on the pressure limiter (10).

(b) Install the pressure limiter (10) on the central tunnel under the left seat

using washers (30) and nuts (34).

tunnel.

(d) Assemble the hoses (16; 17) with banjo fittings (23) (see 2.C.(10)).

(e) Connect the hoses (16; 17) with the pressure limiter (10) using banjo

bolt (21) and gasket rings (24).

(f)

Fill the brake system with the brake fluid (see 2.C.(12)).

(g) Install the left laminated seat (Chapter 25-10).

Effectivity:

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29. 01. 2020

LANDING GEAR

(h) Install the pedestal panel (Chapter 27-50).

(i)

Carry out a test and check:

•

If all bolt connections are tight.

•

Tightness of the brake system.

•

That no foreign objects remain in the aircraft.

(7) Brake caliper removal:

(a) Jack the aircraft and secure the tail (Chapter 07-10).

(b) Remove the main wheel (Chapter 32-10).

the spiral hose (36, Fig. 32-17).

(d) Disconnect the brake hose (16, 15) by removing the hose fitting (23),

banjo bolt (22) and gasket rings (24).

(e) Remove the wheel axle with the brake caliper (11) (Chapter 32-10).

(f)

Unscrew the bolt (28) and remove the brake caliper (11)
from the wheel axle.

(8) Brake caliper installation:

(a) Install the brake caliper (11, Fig. 32-17) with the wheel axle

on the main landing gear leg (Chapter 32-10).

CAUTION

BLEEDING SCREW MUST DIRECT DOWN.

(b) Apply Loctite 243 on the bolt (28) thread and fix the brake caliper (11)

to the wheel axle.

(d) Connect the brake hoses (16/15) with the brake calipers (11) using

banjo bolts (22) and gasket rings (24).

(e) The brake hoses (16/15) pass through the hole in the fuselage near

the landing gear leg.

(f)

Connect the brake hoses to the wire using the spiral hose (36) and
secure it with sealing adhesive tape to the middle of the landing leg.

(g) Install the main wheel (Chapter 32-10).

(h) Carry out a test and check:

•

If all bolt connections are tight.

•

Tightness of the brake system.

•

That no foreign objects remain in the aircraft.

(9) Brake hoses removal:

(a) Cut the hose fittings at the end of hoses and pull them out.

WHEELS AND BRAKES

LANDING GEAR

(10) Assembly of the banjo fittings on hoses:

NOTE

Install a new banjo fittings when specified during the installation
of the brake system.

(a) Before each installation use always a new main fitting body, olive, and

socket (Fig. 32-18).

Fig. 32-18 Nose Banjo Fittings

(b) Cut the hose to a required length (hole must be circular profile). Push

the socket onto the hose. Rub down the stainless steel from the PTFE
tube (5 mm min. length) (Fig. 32-19).

Fig. 32-19 Rub-down of Stainless Steel from the PTFE Tube

steel.

CAUTION

CAUTION: MAKE SURE THAT ALL THE STAINLESS STEEL
FIBRES ARE OUTSIDE THE OLIVE.

(d) Push the olive against a flat solid surface, make sure that the PTFE

tube is fully settled on the olive (Fig. 32-20).

Fig. 32-20 Settled PTFE Tube on the Olive

Effectivity:

ALL

12. 06. 2020

LANDING GEAR

(e) Insert the main fitting body, lubricate the thread, screw the socket

in and tighten using a Vice (Fig. 32-21).

Fig. 32-21 Assembled Main Fitting Body on the Hose

(11) Brake pads replacement:

The brake pads must be replaced when the thickness of the braking layer
is under 2 mm. The brake pads must be replaced on both brake calipers.

Type of maintenance: Line

Personnel qualification: Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Rag

1 pc

Hex key 6

1 pc

New brake pads

2 pcs

Loctite 243

Persons

Beringer documentation- Change of brake pads

Tab. 32-13 Recommended tools, materials, persons and documentation

(a) Jack the aircraft and secure the tail (Chapter 07-10).

(b) Remove the main wheel (Chapter 32-10).

and the brake pads (4).

(d) Clean the area around the pistons with a dry rag.

(e) Push the pistons backward with one finger (no force is needed).

If you cannot push the pistons backward with one finger, the caliper
must be checked and rebuilt.

(f)

Install the new brake pads (4) and brake pad support (3).

(g) Apply Loctite 243 on the bolts (1; 2) threads and tighten the bolts

(1; 2) at torque moment 25 Nm.

WHEELS AND BRAKES

LANDING GEAR

(h) Install the main wheel (Chapter 32-10).

(i)

Carry out a test and check:

•

Torque moments.

•

Brake system efficiency.

– Allen bolt M8 x 41

– Brake pad

– Allen bolt M8 x 30

– Brake caliper body

– Brake pad support

Fig. 32-22 Brake Pads

Effectivity:

ALL

12. 06. 2020

LANDING GEAR

(12) Brake system draining, filling and bleeding:

Type of maintenance: Line

Personnel qualification: Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Beringer jig

1 pc

Rags

2 pcs

Drain hose

ø 6x300 mm

3 pcs

Container

2 pcs

Brake fluid

Loctite 243

Persons

Beringer documentation - Brake system bleeding
procedure

Tab. 32-14 Recommended tools, materials, persons and documentation

WARNING

DO NOT GET BRAKE FLUID ON YOUR SKIN OR IN YOUR
MOUTH. BRAKE FLUID CAN CAUSE DISEASE.

CAUTION

REMOVE SPILLED BRAKE FLUID IMMEDIATELY. BRAKE
FLUID CAN CAUSE DAMAGE TO PAINT AND OTHER
MATERIALS.

(a) Put the aircraft on levelled surface.

(b) Remove the main landing gear fairings (Chapter 32-10).

(d) Release the brake lever.

(e) Remove the left seat (Chapter 25-10).

(f)

On both calipers, connect the drain hose to the bleeding screw
(1, Fig. 32-23) and put the free end into the containers. Release both
bleeding screws.

(g) Unscrew the cap (2) on the brake fluid reservoir and remove

the membrane. Screw the Beringer jig on the brake fluid reservoir
(Fig. 32-24).

(h) Pump on the Beringer jig until all brake fluid has been drained into

the containers.

(i)

Remove the Beringer jig from brake fluid reservoir.

(j)

Install the bleeding container on the brake fluid reservoir (Fig. 32-25).

(k)

Remove drain hoses from caliper’s bleeding screws and install
the Beringer jigs on both caliper’s bleeding screws (1, Fig. 32-23).

WHEELS AND BRAKES

LANDING GEAR

(l)

Pour the new brake fluid into the tank of Beringer jigs.

(m) Pump on both Beringer jigs and fill the brake system with the new

brake fluid until a clear brake fluid begins to flow out from brake fluid
reservoir.

(n) Connect the drain hose on pressure limiter bleeding screw (3) and put

the free end into the container. Release the bleeding screw of pressure
limiter. Pump on the Beringer jigs until brake fluid begins to flow out
without air bubbles. Tighten bleeding screw of pressure limiter.

(o) Remove drain hose from pressure limiter.

NOTE

Push the brake lever forward and backwards to speed up
the bubble release.

(p) Connect drain hose to the master cylinder bleeding screw (4) and put

the free end into the container. Release the bleeding screw of master
cylinder. Pump on the Beringer jigs until brake fluid begins to flow out
without air bubbles. Tighten bleeding screw of master cylinder.

(q) Remove drain hose.

(r)

Pump on the Beringer jigs until a clear brake fluid begins to flow out
from brake fluid reservoir.

(s)

Tighten the caliper’s bleeding screws.

(t)

Decompress and disconnect the Beringer jigs.

(u) Put a cloth under the brake fluid reservoir and disconnect

the bleeding container from the brake fluid reservoir.

CAUTION

CAUTION: CHECK THE LEVEL OF THE BRAKE FLUID
IN THE BRAKE FLUID RESERVOIR.

(v) Clean spilled brake fluid and replenish the brake fluid to the max. level

in the brake fluid reservoir. Install the membrane and cap
of brake fluid reservoir.

(w) Check and tighten all the bleeding screws.

(x) Install the left seat (Chapter 25-10).

(y) Remove wheel chocks.

(z) Install the main landing gear fairings (Chapter 32-10).

(aa) Carry out a test and check:

•

If all bleeding screws are tight.

•

Tightness of the brake system.

•

That no foreign objects remain in the aircraft.

Effectivity:

ALL

12. 06. 2020

LANDING GEAR

– Caliper’s bleeding screw

– Pressure limiter’s bleeding screw

– Brake fluid reservoir

– Master cylinder’s bleeding screw

Fig. 32-23 Bleeding Points

STEERING

LANDING GEAR

32-50 STEERING

1. DESCRIPTION

The aircraft is equipped with a steerable nose gear. The steering is controlled
by the rudder pedals.

The rudder pedals are connected to the nose landing gear leg by means of push-pull
rods fitted with bearing eyes. The hole in the firewall for push-pull rod is protected
with a flange with fireproof sleeve.

2. MAINTENANCE PRACTICES

Steering push rods

Type of maintenance:

Heavy

Personnel qualification:

Independent certifying staff qualified in accordance

with Part-66 or higher.

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Wrench 10

2 pcs

Hex key 5

1 pc

Screwdriver

1 pc

Serrated locking washer ø6.4

4 pcs

Persons

Tab. 32-15 Recommended tools, materials, persons and documentation

(1) Steering push rods removal:

(a) Jack the aircraft and secure the tail (Chapter 07-10).

(b) Remove the engine cowlings (Chapter 71-10).

strut lever by unscrewing the nut (12, Fig. 32-26), remove
the washers (8, 9) and the bolt (6).

(d) At the push rod, loosen the hose clamp (14) and the sleeve (3).

(e) If necessary, remove the sleeve by unscrewing the bolts (7).

(f)

In the cockpit, disconnect the push rod from the foot control
by removing the nut (12) washer (9) and bolt (5).

(g) Remove the second push rod.

Effectivity:

ALL

12. 06. 2020

LANDING GEAR

(2) Steering push rods installation:

(a) Jack the aircraft and secure the tail (Chapter 07-10).

(b) If necessary, install the sleeve (3, Fig. 32-26) using bolts (7)

and sleeve flange (4) on the firewall.

the hose clamp (14) on the sleeve (3).

NOTE

Pay attention to correct connecting of the push rods. The longer
push rod (1) is on the right side and the shorter push rod (2) is
on the left side.

(d) Connect the push rod with the torsion tube using bolt (5), washer (9)

and nut (12).

(e) Connect the push rod with the nose strut lever using bolt (6), washers

(8; 9) and nut (12).

If a new push rod(s) is used (1; 2):

•

At the engine side of the push rod end, install the washer (10).

•

Set the pedals to the middle position.

•

Align the axis of the pedals at a distance of 230 mm

from the firewall and fix them.

•

Fix the nose landing gear in the neutral position.

•

Adjust the length of the push rods (1; 2) so it is possible

to connect the nose strut with the foot control.

(f)

Tighten the hose clamps (14) so that a full steering is available.

(g) Install the engine cowlings (Chapter 07-10).

(h) Carry out a test and check:

•

If all bolt connections are tight.

•

Alignment of the rudder with the nose gear.

•

Plays.

•

Free movement of the rudder control system (nose wheel must

be off the ground).

(i)

That no foreign objects remain in the aircraft.

WT9 Dynamic LSA. AIRCRAFT MAINTENANCE MANUAL (AS-AMM-01-000, 22. 05. 2017) - page 25