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

DISTRIBUTION

FUEL

28-20 DISTRIBUTION

1. DESCRIPTION

Fuel is supplied to the engine in dependence from

FUEL

selector valve position

(

LEFT

RIGHT

OFF

). From both fuel tanks, the fuel flows through the fuel strainers

and fuel filters to the

FUEL

selector valve inlets.

From the

FUEL

selector valve the fuel flows through the electric fuel pump (by-passed

with check valve) to engine driven fuel pump and then to distributor inlet.

One of distributor's outlets is connected to carburettors through the fuel flow meter
sensor and 3-way distributor. Fuel flow transducer is installed the way to measure only
the fuel consumed by engine. Second one is fitted with restrictor jet to which return line
is connected. Return line leads back to the left fuel tank.

Fuel pressure sensor and standby fuel pressure indicator are installed in the fuel
system and connected through the 3-way distributor with restrictor jets in its outlets
to the 4-way distributor. Both check the actual pressure in the fuel supply line.

Wing fuel tanks are ventilated from the highest point through the pipe inside of fuselage
wing tanks and discharge through the hoses which exit through the lower fuselage skin
in the central tunnel in front of main spar.

Scheme of fuel system is shown at Fig. 28-1.

Fuel lines in the engine compartment are protected with a fire pyro jacket covering.
Fuel lines are fixed to avoid wear from vibrations.

Effectivity:

ALL

12. 06. 2020

FUEL

2. MAINTENANCE PRACTICES

Electric fuel pump

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 7

1 pc

Wrench 10

1 pc

Screwdriver

1 pc

Pliers

1 pc

Oetiker pliers

1 pc

Persons

Tab. 28-2 Recommended tools, materials, persons and documentation

WARNING

GROUND THE EXHAUST PIPE OUTLET AND FUEL SERVICE
EQUIPMENT PRIOR TO AIRCRAFT REFUELING/DEFUELING!

ENGINE IGNITION MUST BE SWITCHED OFF. DISCONNECT
NEGATIVE TERMINAL OF AIRCRAFT BATTERY.

DRAINING ALL FUEL FROM THE FUEL SYSTEM IS NOT
POSSIBLE, BE CAREFUL DURING DISASSEMBLING THE FUEL
SYSTEM!

(1) Electric fuel pump removal:

Make sure that the

IGNITION

switches are set to

OFF

Remove engine cowlings (Chapter 71-10).

Disconnect negative terminal of battery (Chapter 24-30).

Electrically ground the aircraft (use the exhaust pipe outlet)

to the grounding point.

Drain fuel tanks (Chapter 12-10).

Unscrew the nuts (19; 20, Fig. 28-3) and remove the washers
(21; 22) and disconnect the wires (18).

Unscrew the nut (7), remove the washer (8) and the bolt (9).

Remove the hose clamps (12) on both sides of el. fuel pump (1).

Disconnect the el. fuel pump (1) from hoses (14; 15) and remove it.

Remove the clamp (3).

DISTRIBUTION

FUEL

– El. fuel pump

– Bolt M6 x 18

– Fuel hose

– One-way valve

– Self-locking nut M5

– El. wires

– Clamp

– Washer ø5.3 x 10 x 1

– Nut M5

– Clamp

– Hose clamp 15.5

– Nut M4

– Bracket

– Hose clamp 14.0

– Washer 5

– Washer ø5.3 x 15 x 1.2

– Fuel hose

– Washer 4

– Self-locking nut M6

– Fuel hose

– Washer ø6.4 x 12 x 1.6

– Fuel hose

Fig. 28-3 Electric Fuel Pump Removal / Installation

Effectivity:

ALL

12. 06. 2020

FUEL

(2) Electric fuel pump installation:

Make sure that the

IGNITION

switches are set to

OFF

WARNING

BEWARE TO ENSURE CORRECT DIRECTION OF FLOW!

Put clamp (3, Fig. 28-3) on the fuel pump body. Put the hose clamps

(12) on the fuel hoses (14, 15) and connect to the el. fuel pump (1).

Check correct orientation of el. fuel pump.

Secure the hose clamps (12).

Align clamp (3) with bracket (5) and attach the el. fuel pump (1) using

bolt (9), nut (7) and the washer (8).

By means of the nuts (19; 20) and the washers (21; 22) connect
the wires (18).

Check if fuel pump is firmly secured and sealed.

Connect negative terminal of the battery (Chapter 24-30).

Replenish the fuel system (Chapter 12-10).

Remove the ground cable from the aircraft.

Carry out engine ground test; check the fuel pump function and fuel

system for leaks.

One-way valve

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

1 pc

Pliers

1 pc

Oetiker pliers

1 pc

Persons

Tab. 28-3 Recommended tools, materials, persons and documentation

WARNING

GROUND THE EXHAUST PIPE OUTLET AND FUEL SERVICE
EQUIPMENT PRIOR TO AIRCRAFT REFUELING/DEFUELING!

ENGINE IGNITION MUST BE SWITCHED OFF. DISCONNECT
NEGATIVE TERMINAL OF AIRCRAFT BATTERY.

DRAINING ALL FUEL FROM THE FUEL SYSTEM IS NOT
POSSIBLE, BE CAREFUL DURING DISASSEMBLING THE FUEL
SYSTEM.

DISTRIBUTION

FUEL

(1) One-way valve removal:

Make sure that the

IGNITION

switches are set to

OFF

Remove engine cowlings (Chapter 71-10).

Disconnect negative terminal of battery (Chapter 24-30).

Electrically ground the aircraft (use the exhaust pipe outlet)

to the grounding point.

Drain fuel tanks (Chapter 12-10).

Remove hose clamps (12, Fig. 28-3) and disconnect one-way valve
(2) from hoses (16; 17).

(2) One-way valve installation:

Make sure that the

IGNITION

switches are set to

OFF

WARNING

BEWARE TO ENSURE CORRECT DIRECTION OF FLOW!

Put the hose clamps (12, Fig. 28-3) on the fuel hoses (16; 17) and

connect to the one-way valve (2).

Check correct orientation of one-way valve.

Secure the hose clamps (12).

Check if one-way valve is firmly secured and sealed.

Connect negative terminal of the battery (Chapter 24-30).

Replenish the fuel system (Chapter 12-10).

Remove the ground cable from the aircraft.

Carry out engine ground test; check fuel system for leaks.

Fuel filter

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 10

1 pc

Wrench 13

1 pc

Screwdriver

1 pc

Pliers

1 pc

Oetiker pliers

1 pc

Persons

Tab. 28-4 Recommended tools, materials, persons and documentation

Effectivity:

ALL

12. 06. 2020

FUEL

WARNING

GROUND THE EXHAUST PIPE OUTLET AND FUEL SERVICE
EQUIPMENT PRIOR TO AIRCRAFT REFUELLING/DEFUELING!

ENGINE IGNITION MUST BE SWITCHED OFF. DISCONNECT
NEGATIVE TERMINAL OF AIRCRAFT BATTERY.

DRAINING ALL FUEL FROM THE FUEL SYSTEM IS NOT
POSSIBLE, BE CAREFUL DURING DISASSEMBLING THE FUEL
SYSTEM.

NOTE

Described is removal and installation one side.

(1) Fuel filter removal:

Make sure that the

IGNITION

switches are set to

OFF

Remove engine cowlings (Chapter 71-10).

Disconnect negative terminal of battery (Chapter 24-30).

Electrically ground the aircraft (use the exhaust pipe outlet)

to the grounding point.

Drain fuel tanks (Chapter 12-10).

In front of seats remove the cover (1; 2, Fig. 06-4, Chapter 06-00).

Remove the hose clamps (7, Fig. 28-4).

Unscrew the nut (3), remove the washers (4; 5) and distance tube (6).

Disconnect the fuel filter (1) from hoses (8; 9).

Remove fuel filter (1) from fuel filter clamp (2).

(2) Fuel filter installation:

Make sure that the

IGNITION

switches are set to

OFF

WARNING

BEWARE TO ENSURE CORRECT DIRECTION OF FLOW!

Put the fuel filter clamp (2, Fig. 28-4) on the fuel filter (1) and hose

clamps (7) on the fuel hoses (8; 9).

Connect fuel hoses (8; 9) to the fuel filter (1)

Check correct orientation of fuel filter.

Secure the hose clamps (7).

Attach fuel filter clamp (2) on laminated bolt using distance tube (6),
washers (4; 5) and tighten the nut (3).

Check if fuel filter is firmly secured and sealed.

In front of seats install the cover (1; 2, Fig. 06-4, Chapter 06-00).

Connect negative terminal of the battery (Chapter 24-30).

Replenish the fuel system (Chapter 12-10).

Remove the ground cable from the aircraft.

Carry out engine ground test; check fuel system for leaks.

DISTRIBUTION

FUEL

– Fuel filter

– Distance tube

– Filter clamp

– Hose clamp 12

– Self-locking nut M6

– Fuel hose

– Washer ø6.4 x 12 x 0.5

– Fuel hose

– Washer ø6.4 x 12 x 1.6

Fig. 28-4 Fuel Filter Removal / Installation

Effectivity:

ALL

12. 06. 2020

FUEL

Fuel strainer

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 17

2 pcs

Pliers

1 pc

Oetiker pliers

1 pc

Hose clamps (as appropriate)

Loctite 577

Persons

Tab. 28-5 Recommended tools, materials, persons and documentation

WARNING

GROUND THE EXHAUST PIPE OUTLET AND FUEL SERVICE
EQUIPMENT PRIOR TO AIRCRAFT REFUELLING/DEFUELING!

ENGINE IGNITION MUST BE SWITCHED OFF. DISCONNECT
NEGATIVE TERMINAL OF AIRCRAFT BATTERY.

DRAINING ALL FUEL FROM THE FUEL SYSTEM IS NOT
POSSIBLE, BE CAREFUL DURING DISASSEMBLING THE FUEL
SYSTEM.

NOTE

Described is removal and installation of strainer on right side. The process
is the same for left side.

(1) Fuel strainer removal and cleaning:

Make sure that the

IGNITION

switches are set to

OFF

Remove engine cowlings (Chapter 71-10).

Disconnect negative terminal of battery (Chapter 24-30).

Electrically ground the aircraft (use the exhaust pipe outlet)

to the grounding point.

Drain fuel tanks (Chapter 12-10).

Remove hose clamp (3, Fig. 28-5); Disconnect hose (4) from socket
(2).

Remove fuel strainer (1) together with socket (2) from flange (5).

If necessary, disassemble socket (2) and fuel strainer (1).

Clean fuel strainer with compressed air.

DISTRIBUTION

FUEL

(2) Fuel strainer installation:

Make sure that the

IGNITION

switches are set to

OFF

If necessary, assemble fuel strainer (1, Fig. 28-5) and socket (2). Apply

Loctite 577 on threads to secure and seal the joint.

Screw assembled fuel strainer (1) into flange (5). Apply Loctite 577

on threads to secure and seal the joint.

WARNING

BEWARE TO ENSURE THE FUEL STRAINER IS CLEAN!

Insert new hose clamp (3) on hose (4); Plug hose (4) on socket (2).

Secure the hose clamp (3) using Oetiker pliers.

Connect negative terminal of the battery (Chapter 24-30).

Replenish the fuel system (Chapter 12-10).

Remove the ground cable from the aircraft.

Carry out engine ground test; check fuel system for leaks.

– Fuel strainer

– Hose to fuel filter

– Socket

– Strainer flange

– Hose clamp

– Rib

Fig. 28-5 Fuel Filter Removal / Installation

Effectivity:

ALL

12. 06. 2020

FUEL

Fuel selector

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 9

2 pcs

Screwdriver

1 pc

Hex key 2

1 pc

Pliers

1 pc

Oetiker pliers

1 pc

Serrated locking washer

ø6.4

6 pcs

Loctite 542

Lockwire

ø0.8 mm

Persons

Tab. 28-6 Recommended tools, materials, persons and documentation

WARNING

GROUND THE EXHAUST PIPE OUTLET AND FUEL SERVICE
EQUIPMENT PRIOR TO AIRCRAFT REFUELLING/DEFUELING!

ENGINE IGNITION MUST BE SWITCHED OFF. DISCONNECT
NEGATIVE TERMINAL OF AIRCRAFT BATTERY.

DRAINING ALL FUEL FROM THE FUEL SYSTEM IS NOT
POSSIBLE, BE CAREFUL DURING DISASSEMBLING THE FUEL
SYSTEM.

(1) Fuel selector removal:

Make sure that the

IGNITION

switches are set to

OFF

Remove engine cowlings (Chapter 71-10).

Disconnect negative terminal of battery (Chapter 24-30).

Electrically ground the aircraft (use the exhaust pipe outlet)

to the grounding point.

Drain fuel tanks (Chapter 12-10).

On fuel selector handle (3, Fig. 28-6), unscrew the hex bolt and
remove fuel selector handle.

Unscrew the screws (4) and remove the flange (2).

Pull fuel selector (1) into central instrument panel. From the left side

of central instrument panel, remove hose clamps (8) and disconnect
fuel selector (1) from hoses (10; 11; 12).

Disassemble fuel valve (1), by unscrewing hose fitting nuts (6), elbow
fittings (5), removing hose sockets (7) and olives (9).

DISTRIBUTION

FUEL

– Fuel selector body

– Hose clamp 14.5

– Flange

– Olive

– Fuel selector handle

– Fuel hose (from LH fuel tank)

– Screw M4 x 16

– Fuel hose (to engine)

– Elbow fitting

– Fuel hose (from RH fuel tank)

– Hose fitting nut

For information:

– Hose socket

– Central console

Fig. 28-6 Fuel Selector Removal / Installation

Effectivity:

ALL

12. 06. 2020

FUEL

(2) Fuel selector installation:

Make sure that the

IGNITION

switches are set to

OFF

Prepare fuel selector:

•

Screw hose fitting elbows (5, Fig. 28-6) to fuel selector (1)
secured with Loctite 542.

•

Screw hose fitting nuts (6) with hose sockets (7) and olives (9).

•

Release hex head bolt and remove fuel selector handle (3).

WARNING

BEWARE TO ENSURE CORRECT DIRECTION OF FLOW!

Connect fuel hoses (10; 11; 12) to the fuel valve hose sockets (7) and

secure them with hose clamps (8).

Put fuel selector (1) into middle instrument panel, put on flange (2) and

screw the screws (4).

Put fuel selector handle on (3) and tighten hex head bolt.

Check if selector is firmly secured and sealed.

Connect negative terminal of the battery (Chapter 24-30).

Replenish the fuel system (Chapter 12-10).

Remove the ground cable from the aircraft.

Carry out engine ground test; check fuel system for leaks.

DISTRIBUTION

FUEL

Fuel lines

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

Socket 12

1 pc

Screwdriver 5

1 pc

Phillips screwdriver

1 pc

Cable tie 2.6

Cable tie 4.8

Restrictor jet

3 pcs

Pliers

1 pc

Oetiker pliers

1 pc

Hose clamps (as appropriate)

Silicone

Pyrosil tape (fire resistant end sealing tape)

Pyro jacket covering (fire sleeve)

Rags

Aircraft Wiring Manual (Doc. No. AS-AWM-01-000)

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

Persons

Tab. 28-7 Recommended tools, materials, persons and documentation

WARNING

GROUND THE EXHAUST PIPE OUTLET AND FUEL SERVICE
EQUIPMENT PRIOR TO AIRCRAFT REFUELLING/DEFUELING!

ENGINE IGNITION MUST BE SWITCHED OFF. DISCONNECT
NEGATIVE TERMINAL OF AIRCRAFT BATTERY.

DRAINING ALL FUEL FROM THE FUEL SYSTEM IS NOT POSSIBLE,
BE CAREFUL DURING DISASSEMBLING THE FUEL SYSTEM.

Effectivity:

ALL

12. 06. 2020

FUEL

(1) Fuel lines removal:

Make sure that the

IGNITION

switches are set to

OFF

Remove engine cowlings (Chapter 71-10).

Disconnect negative terminal of battery (Chapter 24-30).

Electrically ground the aircraft (use the exhaust pipe outlet)

to the grounding point.

Remove airbox and air filter holder (Chapter 71-60).

Remove cable ties along of length of fuel hoses.

On engine fuel pump unstick end sealing tapes, remove hose clamps

(20; 22, Fig. 28-7) and disconnect fuel hoses (1; 2).

On both carburettors unscrew and remove banjo bolt (30), gasket rings

(33) and distance tube (32) and disconnect fuel hoses (3; 5).

In engine compartment, on 4-way distributor (28), unstick end sealing
tapes, remove hose clamps (23) and disconnect the hoses (1; 16; 17;
19).

On 3-way distributor (27) connecting carburettors with fuel flow
transducer, unstick end sealing tapes, remove hose clamps (23) and
disconnect hoses (3; 4; 5).

On 3-way distributor (27) connecting the fuel pressure sensor

with the fuel pressure indicator, unstick end sealing tapes, remove
hose clamps (23) and disconnect hoses (15; 18; 19).

On 3-way distributors (27) connecting el. fuel pump, one-way valve,
fuel filter and fuel selector, remove hose clamps (23) and disconnect
hoses (2; 11).

Disconnect fuel flow transducer (Chapter 28-40, 2.G.).

Disconnect fuel pressure sensor (Chapter 28-40, 2.F.).

Disconnect the fuel hoses from fuel selector (2.E.).

Disconnect the fuel hoses from fuel filters (2.C.).

Disconnect the fuel hoses from fuel strainers (2.D.).

Remove wing (Chapter 57-20) and remove hoses (12; 13; 14)
by removing hose clamps (25; 26).

DISTRIBUTION

FUEL

(2) Fuel lines installation:

Put the pyro jacket (fire sleeve) coverings along the length of fuel

hoses in engine compartment.

On engine fuel pump, slide fuel hoses (1; 2, Fig. 28-7) and secure them

with hose clamps (20; 22).

On carburettor fittings, connect hoses (3; 5) by means of the banjo bolt

(30), gasket rings (33) and distance tube (32).

WARNING

DO NOT FORGET TO PUT RESTRICTOR JETS TO 3 WAY
DISTRIBUTOR AND 4 WAY DISTRIBUTOR!

Put restrictor jets (29) to 3-way distributor (27) and connect fuel hoses

(15; 18; 19) secure them with hose clamps (23) and stick end sealing
tapes.

NOTE

Restrictor jets serve to compensate pressure shocks.

Put restrictor jet (29) to 4-way distributor (28) and connect fuel hoses

(1; 16; 17; 19) secure them with hose clamps (23) and stick end
sealing tapes.

Connect fuel hoses (3; 4; 5) to the 3-way distributors (27) connecting
carburettors with fuel flow transducer and secure them with hose
clamps (23).

Connect fuel hoses (2; 11) to the 3-way distributors (27) connecting

el. fuel pump, one-way valve and fuel selector and secure them
with hose clamps (23).

Connect fuel flow transducer (Chapter 28-40, 2.G.).

Connect fuel pressure sensor (Chapter 28-40, 2.F.).

Connect the fuel hoses to fuel selector (2.E.).

Connect the fuel hoses to fuel filters (2.C.).

Connect the fuel hoses to fuel strainers (2.D.).

Seal ends of pyrojacket (fire sleeve) coverings with pyrosil end sealing

tape.

Install cable ties along of length of fuel hoses.

Install airbox and air filter holder (Chapter 71-60).

Connect fuel hoses (12; 13; 14) to wing hose sockets and secure

with hose clamps (24; 26). Install wing (Chapter 57-20), connect fuel
hoses (12; 13; 14) to fuselage hose sockets and secure with hose
clamps (25; 26).

Effectivity:

ALL

12. 06. 2020

FUEL

NOTE

Hose (12) belongs to ventilation line and hose (13) connecting
wing and fuselage fuel tanks.

Installing fuel hoses between right side fuel tanks are same.

Check if all hoses are well secured.

Check if all bolts are tight.

Check correct orientation of fuel filters, el. fuel pump and one-way

valve.

Check sealing of fuel system (2.F.(3)).

Remove the ground cable from the aircraft.

Check that no foreign objects remain in aircraft.

(3) Check sealing of fuel system:

NOTE

Fuel system must be completely drained.

Make sure that the

IGNITION

switches are set to

OFF

Remove the engine cowlings (Chapter 71-10).

Disconnect negative terminal of battery (Chapter 24-30).

Electrically ground the aircraft (use the exhaust pipe outlet)

to the grounding point.

Disconnect hoses connected to carburettors and seal them.

Seal fuel tank caps.

Put air pump with air gauge under fuselage and connect to both ends

of ventilation hoses.

Pressurize fuel system with air on 10 kPa. Switch the fuel selector

during pressurization.

During first 15 min. switch fuel selector 3 times.

After 30 min. no pressure drop is allowed.

Depressurize the fuel system and assemble fuel hoses

on carburettors.

Install the engine cowlings (Chapter 71-10).

WT9 Dynamic LSA. AIRCRAFT MAINTENANCE MANUAL (AS-AMM-01-000, 22. 05. 2017) - page 20