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

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SERVICING

C. Engine cooling system

Aircraft has combined water and air cooling system. Coolant capacity is
approximately 2.5 l (cooling system + overflow bottle).

WARNING

ALWAYS ALLOW ENGINE TO COOL DOWN TO AMBIENT
TEMPERATURE BEFORE START OF ANY WORK.
ENGINE IGNITION MUST BE SWITCHED OFF.
NEVER OPEN THE EXPANSION TANK CAP WHEN THE COOLING

SYSTEM IS HOT. FOR SAFETY´S SAKE, COVER CAP

WITH A RAG AND OPEN SLOWLY. SUDDEN OPENING
OF THE CAP COULD PROVOKE THE ESCAPE OF BOILING
COOLANT AND RESULT IN SCALDING.

(1) Coolant level and condition check:

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

Densimeter

1 pc

Glycol tester

1 pc

New coolant

Persons

Tab. 12-9 Recommended tools, materials, persons and documentation

NOTE

It is only possible to check correct level of cooling fluid when
the engine is cold.

(a) Put the aircraft on leveled surface.
(b) Set the brake lever to

PARK

position or install wheel chocks.

(c)  Remove engine cowlings (Chapter 71-10).
(d)  Open the cap on the expansion tank (5, Fig. 12-1).
(e)  Check the coolant level in the expansion tank. The coolant level must

be filled up to the top.

(f)

Check the coolant level in the overflow bottle. The coolant level must
be between min. and max. level marks.

(g) Inspect coolant with densimeter or glycol tester. Strongly discolored

or thickened coolant has to be changed.

(h) Replenish or change if required.
(i)

Release

PARK

lever or remove wheel chocks.

REPLENISHING

SERVICING

(2) Coolant replenishing:

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

New coolant

Persons

Tab. 12-10 Recommended tools, materials, persons and documentation

NOTE

If necessary, replenish with coolant of same specification. Make
sure that the corresponding kind of coolant is used (Tab. 12-1)
or according to the specification stated at the label in the engine
compartment.

(a) Put the aircraft on leveled surface.
(b) Set the brake lever to

PARK

position or install wheel chocks.

(c)  Remove engine cowlings (Chapter 71-10).
(d)  Open the cap on the expansion tank (5, Fig. 12-1).
(e)  Check the coolant level and replenish if necessary. The coolant level

must be filled up to the top.

(f)

Tighten the cap; cap has to be tightened until the stop lug is touched.

(g) Open the cap on the overflow bottle (6, Fig. 12-1).
(h) Check the coolant level and replenish. The coolant level has to be

between min. and max marks.

(i)

Tighten the cap.

(j)

Install engine cowlings (Chapter 71-10).

(k) Release

PARK

lever or remove wheel chocks.

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SERVICING

(3) Coolant change:

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

Screwdriver 10

1 pc

Rag

1 pc

Syringe

1 pc

Suitable container

1 pc

New coolant

Persons

Maintenance Manual (Line Maintenance) for Rotax
Engine Type 912 Series (Ref. No. MML-912)

Tab. 12-11 Recommended tools, materials, persons and documentation

(a) Put the aircraft on leveled surface.
(b) Set the brake lever to

PARK

position or install wheel chocks.

the cap on expansion tank (5, Fig. 12-1).

(d) Disconnect hose (11/12, Fig. 75-2) on water radiator and drain

the radiator.

(e) Remove the caps from expansion tank and overflow bottle and suck

the coolant.

(f)

Connect the hose (11/12, Fig. 75-2) and tighten hose clamp
(9, Fig. 75-2).

(g) Refill newly mixed coolant into the expansion tank and overflow bottle.
(h) Tighten the caps; cap of expansion tank must be tightened until

the stop lug is touched.

(i)

Run the engine for a short period and then check the level of coolant.

(j)

If necessary, add concentrated coolant.

(k) Check if hoses are tight and secured.
(l)

Check the coolant level.

(m) Install engine cowlings (Chapter 71-10).
(n) Release

PARK

lever or remove wheel chocks.

REPLENISHING

SERVICING

D. Tires

The aircraft uses following tires:

•

Nose landing gear wheel 13x5 with tire 13x5.00-6.

•

Main landing gear wheels 15x6 with tires 15x6.00-6.

During aircraft operation, keep the landing wheels tires inflated to recommended
pressure (see Table 12-12) to ensure maximum service life and reduced damage
resulting from the landing on gravel with sharp edges. When filling or checking
tire pressure, inspect tires for signs of abnormal wear, cuts, or abraded surfaces.

ITEM

RECOMMENDED PRESSURE

kPa

Nose landing gear wheel

200

Main landing gear wheel

250

Tab. 12-12 Tires Pressure

(1) Checking and inflation of tires:

Type of maintenance:

Line

Personnel qualification:

Pilot/Owner

qualified

accordance

with M.A.803 or higher

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Pressure gauge

1 pc

Inflation pump

1 pc

Cotton cloth

Soap water

Persons

Tab. 12-13 Recommended tools, materials, persons and documentation

(a) Set the brake lever to

PARK

position or install wheel chocks.

(b) Remove the adhesive sticker from the wheel fairing to get access

to the tire inflation valve.

(c)  Clean tire inflation valve surroundings (2; 3, Fig. 12-1).
(d)  Screw out the valve cap of the tire inflation valve.
(e)  Using a dial type gauge check the pressure in the tire:

•

at low pressure, inflate the tire to prescribed pressure

•

at higher pressure, deflate the tire to prescribed pressure

by pressing the valve core.

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SERVICING

(f)

Check the tire inflation valve for leakage. Spread soap water
on the valve hole and check if bubbles appear or not. Tighten the tire
inflation valve core or replace it as necessary.

(g) Screw in the valve cap.
(h) Remove wheel chocks.
(i)

Install the adhesive sticker on the wheel fairing.

Brake system

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.

(1) Brake fluid level check and replenish:

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

Cotton cloth

Persons

Tab. 12-14 Recommended tools, materials, persons and documentation

(a)  Put the aircraft on leveled surface.
(b)  Install wheel chocks.
(c)  Release the brake lever.
(d)  Remove the pilot seat (Chapter 25-10).
(e)  Open the cap (8, Fig. 12-1) on the brake fluid reservoir.
(f)

Check if brake fluid level is between min. and max. level marks.

(g) If necessary, replenish with suitable brake fluid of same specification.

Make sure that the corresponding kind of brake fluid is used
(Tab. 12-1) or according to the specification stated at label
in the engine compartment as follows.

(h) Install the cap (8, Fig. 12-1) on the brake fluid reservoir.
(i)

Install pilot seat (Chapter 25-10).

(j)

Remove wheel chocks.

SCHEDULED SERVICING

SERVICING

12-20

SCHEDULED SERVICING

1. INTRODUCTION

This chapter contains the information necessary to perform scheduled service
of the aircraft. In this chapter is presented lubrication chart and instructions for cleaning
the exterior and interior of the aircraft including the required materials.

2. SPECIAL TOOLS, MATERIALS

Recommended tools, materials, persons and documentation:

ITEM

QUANTITY

Vacuum cleaner

1 pc

Lithium grease NLGI 3 MOL Liton LTA 3EP

Oil WD40

Mild-cleaning agent

Automotive polish

Plexiglass cleaner

Technical benzine

Cotton cloth

Sponge

1 pc

Chamois

1 pc

Brush

1 pc

Protective foil

Adhesive tape

Persons

Tab. 12-16 Recommended tools, materials, persons and documentation

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3. LUBRICATION CHART

Lubricate movable or rotary places on the aircraft in scheduled intervals (Tab. 12-17).
Regular lubrication decreases frictional forces in movable joints and protects lubricated
places against corrosion. Use recommended lubricants for lubrication (see below).
The lubricants shall not be contaminated with water or foreign matters and their storage
period or usability shall not be expired. After lubrication is finished, clean the lubricated
places from lubricants excess.
The area in which lubrication is done must be dust-free. Thoroughly clean lubricated
points before lubrication.
After cleaning the aircraft with pressure water, lubricate again places which got into
contact with the water stream (hinges of control surfaces and flaps, the nose and main
landing gear etc.).

Use the manufacturer’s recommended greases

or equivalent greases that meet

the following properties:

Vaseline:

Lithium grease, suitable for bearing applications in mobile technology

and industry. Temperature range of use from -

30 °C to +120 °C. Consistency

NLGI 3 (NLGI classification). The manufacturer recommends MOL Liton LTA
3EP.

Lubrication oil:

Semi-synthetic oil, resistant to high pressure. Suitable

for lubrication of points with high pressure loads, e.g. push rods, Bowden cables,
joint connections. Temperature range of use from -

35 °C to +180 °C.

The manufacturer recommends the use of WD40.

SCHEDULED SERVICING

SERVICING

Location

Lubrication point

100 hr. /

Annual /

Special

Lubricant

Engine installation
(Fig. 12-6)

Engine

Refer to Maintenance
Manual (Line
Maintenance) for Rotax
Engine Type 912 Series
(Ref. No. MML-912),
the latest issue

Throttle control cables at the entry to
bowdens.

Attachment of the throttle control cables at
carburetors.

Throttle control

Choke control cables at the entry to
bowdens

Attachment of the choke control cables at
carburetors.

Choke shaft components at carburetors.

Heating and venting
system
(Fig. 12-6)

Axles of heating and venting flap.

Pull-push control cables of heating and
venting flap at the entrance to bowdens.

Air induction system
(Fig. 12-6)

Axles of the air filter holder with pre-heating.

Brake system

Revolving points of brake lever.

Canopy

Canopy hinges.

Canopy closing mechanism latch.

Ball joints of gas struts.

Nose landing gear
(Fig. 12-6)

Bushings of nose landing gear upper and
lower supports.

Axle of guide wheels.

Pins of beams and stirrup

Elevator control
system
(Fig. 12-6)

Movable connecting points of elevator
control system.

Sliding bearings on the control stick’s

torsion tube.

Movable connecting points of trim system.

Tab. 12-17 Lubrication Chart (page 1 of 2)

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Location

Lubrication point

100 hr. /

Annual /

Special

Lubricant

Rudder control

system

(Fig. 12-6)

Movable connecting points of control push
rods of nose landing gear.

Sliding bearings of foot control.

Bayonet sockets.

Movable connecting points of rudder pedals.

Movable connecting points from foot control
up to the rudder.

Wing flaps control

system

(Fig. 12-6)

Movable connecting points of wing flaps
control system.

Ball joints of gas struts.

Sliding bearings of the torsion tube.

Wing

Wing bushings and pins.

Every 200h

or annually

Sliding casings of push rods in wing root ribs.

Every 200h

or annually

Elevator

Hinges.

Rudder

Hinges.

Ailerons

Hinges.

Wing flaps

Hinges.

Tow release control

system

(towing version only)

Movable points of tow release control
system.

Tow release control handle cable at the entry
to bowden.

Tab. 12-17 Lubrication Chart (page 2 of 2)

Fig. 12-6 Lubrication Chart (page 1 of 6)

Throttle control

SCHEDULED SERVICING

SERVICING

4. AIRCRAFT CLEANING

Type of maintenance:

Line

Personnel qualification:

Pilot/Owner  qualified  in  accordance  with  M.A.803  except
of  engine  cleaning  where  minimum  authorization
independent  certifying  staff  qualified  in  accordance
with Part-66 or higher is required.

Recommended tools, materials, persons and documentation:

List of special tools and materials for the cleaning
of the aircraft is shown in Tab. 12-16.

A. Aircraft painted surfaces cleaning

To  maintain  the  flight  characteristics  of  the  aircraft  shall  be  the  outer  surface
of the aircraft (especially the leading edge of the wings) and the propeller kept
clean.
The  outer  surface  of  the  aircraft  is  covered  with  a  durable  coat  which  keeps
good gloss under normal conditions and does not require to be polished often.
At normal operation, e.g. after a flight day, wash the dirty surface of the aircraft
with water and detergent or with non-active soap. After washing the aircraft with
clean water, dry the aircraft.
lt  is  recommended  to  renew  the  painted  surface  preservation  at  least  twice
a year, e.g. prior to winter operation and after it. A good preservative coating will
protect  the  aircraft  finish  from  the  UV  rays  and  protect  the  surface  against
oxidation. Any good automotive polish or wax may be used.

CAUTION

DO NOT USE CLEANING OR POLISHING AGENTS WHICH
CONTAIN SILICONE. IF THE AIRCRAFT NEEDS REPAIR, SILICONE
CAN

PREVENT

REPAIR

MATERIALS

FROM BONDING

CORRECTLY.

(1) Procedure:

(a) Close all covers and cabin.
(b) Cover tires. Do not allow tires to stand in pools of cleaning solution any

longer than required for the washing operation.

entering.

(d) Protect all control surface bearings and other lubricated components

before cleaning the aircraft.

CAUTION

DO NOT DRY-CLEAN THE DUST

–

THE QUALITY

OF AIRCRAFT PAINTED SURFACE IS DECREASED
BY THIS.

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(e) Use large quantities of water to clean the aircraft. If necessary, add

a mild-cleaning agent to the water and remove dust and dirt
from painted surfaces with a sponge

CAUTION

WHEN  WASHING  THE  AIRCRAFT  WITH  WATER  AND
CLEANING  AGENT,  USE  SPECIAL  CARE  TO  AVOID
WASHING AWAY GREASE FROM ANY LUBRICATED AREA.
PREMATURE  WEAR  OF  LUBRICATED  SURFACES  MAY
RESULT IF THESE PRECAUTIONS ARE NOT OBSERVED.

(f)

Remove oil and grease using a cloth dampened with benzine.

(g) Remove insects with a sponge and water with mild-cleaning agent.
(h) Carefully rinse the surface to remove all cleaning agent.
(i)

Dry the cleaned surface thoroughly with a chamois to prevent
watermarks.

(j)

Apply suitable wax or polish on washed and dry surface of the aircraft,
spread it over and polish it with soft flannel cloth.

NOTE

When using preservation preparations follow instructions given
on the preparations packaging.

(k) Remove Pitot-static tube cover and protecting of control surface

bearings and other lubricated components.

WARNING

LOOK, IF THE HOLES OF PITOT STATIC TUBE ARE FREE;
IN CASE OF DETECTION OBSTACLES IMMEDIATELY
REMOVE THEM.

B. Cabin cleaning

The cabin may only be cleaned by washing it with a sufficient quantity of water
and an adequate quantity of detergents. Use either a soft, clean cloth sponge
or chamois. Then use suitable polishers to clean the cabin.
(1) Procedure:

(a) To avoid scratching the glass surface, take off watches and rings

before cleaning.

(b) Remove excess amounts of dirt and other foreign matter from the glass

surface  with  clean  water.  The  preferred  method  is  to  spray  or  flood
the  surface to  flush  away foreign  materials.  If spraying  or  flooding  is
impractical, thoroughly wet a clean sponge or soft cloth and carefully
wipe the surface.

SCHEDULED SERVICING

SERVICING

CAUTION

NEVER USE GASOLINE, BENZENE, ALCOHOL, ACETONE,
FIRE EXTINGUISHER, ANTI-ICE FLUID, LACQUER THINNER
OR GLASS CLEANER TO CLEAN THE PLEXIGLASS. THESE
MATERIALS WILL CORRODE THE PLEXIGLASS.
DO NOT RUB THE CANOPY WHILE IT IS DRY. DO NOT USE
DIRTY CLOTHS OR SPONGES. THE PLEXIGLASS CANOPY
SCRATCHES VERY EASILY WITH EVEN THE SMALLEST
PARTICLES OF DUST.

with a mild liquid soap.

(d) Carefully rinse the surface to remove all cleaning agent.
(e) Dry the cleaned surface thoroughly with a chamois to prevent

watermarks.

(f)

Polish glass using a special plexiglass cleaner.

NOTE

When using plexiglass cleaner follow instructions given
on the preparations packaging.

C. Interior cleaning

Aircraft interior should be vacuumed at regular intervals to remove surface dirt
and dust. While vacuuming, use a fine bristle nylon brush to help loosen particles.
(1) Procedure:

(a) Clean upholstery with a soft bristle brush, and vacuum where

necessary.

(b) Spots on the upholstery clean with detergent. Use suitable upholstery

cleaning agent for spots not cleanable with detergent.

panels, covers, handles and buttons.

D. Avionics care

Avionics displays have an anti-reflective coating that is very sensitive to skin oils,
waxes, ammonia, and abrasive cleaners. Clean the displays screens with LCD
Screen Cleaning Solution according instructions given on the preparations
packaging.

WT9 Dynamic LSA. AIRCRAFT MAINTENANCE MANUAL (AS-AMM-01-000, 22. 05. 2017) - page 10