Electrical supply system.

I. ELECRICAL EQUIPMENT.

ELECTRICAL SUPPLY SYSTEM.

Electrical supply system consists of:

1. Primary (main) ~ 200v, 400hz system.

2. Secondary (additional) system.

The primary system has 2 independent channels. Every channel consist of the CГO-40ПУ generator and the consumers. In case, if one generator failed, its consumers automatically are connected to the another generator, except the "Deicing system of the MR and TR".

Secondary system consists of:

a) 1ph ~ 115v, 400hz system - is supplied from the primary system

generator №l (by transformer 200/115-TC 1 / 2), but if it failed-from

the generator Xs2. When 2 (two) generators failed, the 1ph x 115v

system will be supplied from the inverter IIO500A, which is

connected by automatically or manually. This system has two bus

bars:

- generator bus-bar - all consumer of 115v

- inverter bus-bar - only IIO-500A consumers

b) 3ph x 36v, 400hz system - is supplied from the primary system

generator №l (by transformer 200/36-TC-310); emergency - from

the generator №2. There are two bus-bars:

- generator bus-bar

- inverter IIT-200Ц bus-bar.

When both generators failed, the inverter IIT-200H will supply the consumers of the "inverter ПT-200Ц bus-bar".

c) 1ph x 36v SYSTEM is supplied from the inverter ITO-500A

(»115v) bus bar. This system feeds ДИМ manometers by means of the two

transformers 115/36v (main and reserve).

d) DC 27v SYSTEM - is supplied from the primary 200v system by

means of the rectifiers BУ-6A (3 pcs). Emergency sources of this system are two

storage batteries, type 12-CAM-28 and the generator CTГ-3 (when the turbo

generator AИ-9 operates). This system has two bus bars:

- rectifiers bus bar

- storage butteries bus bar

3 BУ-6A rectifiers are connected to the rectifiers bus bur, storage batteries - to me storage batteries bus bar. Both bus bars are incorporated while one rectifier operates and the storage batteries are charged.

The rectifier №l is supplied from the generator №l, the rectifiers №2 and №3 are connected to the generator №2. When the generators №2 failed, the rectifier №3 will be supplied from the generator №l.

When both generators or 3 rectifiers failed, the storage batteries will supply the life-important =27v consumers.

e) Ground supply system

There are 2 connectors:

- ШРАП-500К - for connected of the ground =27v supply unit

- ШРАП-400 3Ф - for connected of 3ph x200v.ground supply unit

Power supply sources main data

1. 3ph generator СГО-40ПУ

- voltage 200v

- load current 120a

- power 40kva

- consumption voltage 27v

- consumption current 30a

2. Inverter nO-500A(Iph)

- supply voltage = 27V

- current drain 41A

- output voltage 115V

- output current 4,3A

- power 500VA

3. Inverter IIT-200II (3pb)

- supply voltage = 27V

- current drain 14A

- output voltage 36V

- pove»- 200VA

4. Rectifier BY-6A

- supply voltage 200V

- current drain 25A

- output voltage =27V

- output current 200VA

5. Storage battery 12-CAM-28

- voltage =24V

- capacity 28A * Hour

- discharge current (5 hour) 5,6A

6. Generator CТГ-3 (AИ-9)

- output voltage 28,5V

- current 100 A

- power 3000VA

1st category consumers

1. turbo-generator AH-9

2. inverter ПO-500А

3. inverter ПТ-200Ц

4. 3 pointer indicators ЭМИ-3РИ, ЭМИ-3РВИ.

5. indicator УП-21

6. gas thermometer 2ИA-6

7. temperature regulator PT-12-6

8. vibration indicator ИB-500B

9 ratings Locator ИP-117

10. main and stand-by hydraulic system

11. valve ГA-192 (engine take-off rating control system)

12. left pilot-static tube heater

13. fire-fighting system

14. pilot's domes

15. 2nd group of the red illumination

16. cargo cabin duty illumination

17. navigation lights

18. beacon MCJI-3

19. VHF radio-station

20. radio-compass APK-9

21. interphone system СПУ-7

22. left gyro-horizon AГB-3K

23. radio-altimeter

24. recorder MC-61

25. flight recorder CAPПП-12

26. outer sling lock

27. left windscreen wiper

28. fuel tanks pumps

29. fuel shut-off valves

30. emergency fuel valve

31. detector PИO-3

32. signal flares

3 3. movable stopper system CПУУ-52-1

34. speech informator PИ-65Б

35. right landing searchlight ФПП-7

36. trimmers ЭMT-2M

37. valve ГA-192 of the "collective pitch lever"

MAINTENANCE LIMITTERS

- MR RPM of switching on of the generators СГС-40ПУ 92%

- generators bus-bars voltage 200-205 V

- GPU bus-bar voltage 200-205 V

- inverter IIO-500 bus-bar voltage 115-120 V

- rectifiers BУ-6A bus-bar voltage 27-29V

- storage batteries bus-bar voltage not less than 24V

- GPU dc system voltage 27-29V

- storage batteries flight time 6-7 min

- reserve generator flight time not more than 30min

- MR RPM generators checking 95%

- AФ-150 ammeters readings:

a) normal condition №l <10A

№2<15A

b) deicing system ON №l < 100 A

№2 <30A

c) one generators failed -<30A - normal cond.

-<110A - deicing on

FLIGHT MAINTENANCE

Checking of storage batteries

- set the voltmeter B -1 selector switch to the "AKK 1" (st.BAT1)

position - V > 24V

- the same to check "AKK 2" (st.BAT2)

- switch on the 1st st.battery switch red light "mains from

st.batteries" comes on (left instrument board)

- set the voltmeter selector switch to the "st.batteries bus bar" position

(AKK. ШИНA) connect the service fuel tank pump - V > 24V

- 1st st.batteries is switched off", than check the same way 2nd

st.batteries

- switch on both of the st.batteries

- we must substitute the st.batteries with V < 24V

- checking lime of one st.batteries should not be more than 5sec.

Checking of DC GPU

- connect the GPU to the IUPAT1-500 connector - yellow light "GPU

ON" comes on

- switch on the switch "GPIT

- set the voltmeter selector switch to the "GPU" position - V = 27-29V

- remember: if GPU is in "ON" position, the helicopter power sources

can't be connected to the mains.

Checking of generator CTT-3

After starting-up of the turbo-generator AИ-9, the generator CTГ-3 will operate, as the generator and it is used as the DC power source, when GPU is absent and the engines don't operate. Also it is used in case of failure of 3 rectifiers BУ-6A.

After starting -up of the turbo-generator and after i min of it operation we may switch on the switch "Reserve generator". Voltmeter should indicate 27-29V. If it is necessary we can adjust the voltage by means of the BC-25Б resistor (±2V).

For checking the helicopters equipment we should switch on the switch "Equipment checking" - red light "Equipment checking" comes on.

NOTES:

- perform to switch on the "Checking of the equipment" only on the

ground

CTГ-3 current < 100 A

- prohibited operation at the same time the consumers of the СТГ-3 and

the an-9 starting-up system of the helicopter engine

Checking of AC GPU

- connect the ШРАП-400-3Ф connector - light-panel "GPU ON" (ac

panel) comes on

- switch on the switch "GPU ON"

- check the voltage by the voltmeter BФ-250 and selector switch, it -

V = 200-205V

Checking of main generators

- when MR RPM > 92% switch on the generators by switching

"Gen.1 "Gen. 2" - red lights "Gen failed' should go off after not

more than 3 sec.

- set the switched "ПO" and "ПT" to the position "Automate"

- switch on the BУ-6A rectifiers switches - yellow lights "switch on

rectifier N..." (3pc) will go off

- when MR RPM = 95% check the generators by voltmeter and

selector switch - V = 200-205V, if necessary - to adjust by BC-33

resistor (±10V)

check the rectifiers, switching off two of them, by voltmeter B-l and

ampermeter A-2

check the rectifies and the transformers 200/115, 200/36 V,

switching off the generators one by one

check inverters I1O-500, ITT-200IJ manually switching on:

- ПO-500: V=115-120V, light «nO-500 ON»

- ПT-200: 36V consumers operate normally

Normal maintenance

During the flight AC generators, rectifiers, storage batteries are switching ON.

Periodically we should check the voltage and current of the switched ON consumers.

One rectifier in middle has 35-50A load, max - 90A.

Switching OFF of power sources

a) The AC generators are switched OFF by automatically, when MR RPM

rectifiers switches to the "OFF1" positions.

Main failures

a) One generator CT-40ПУ foiled

It this case:

- red light"... generator failed" comes on

- voltmeter and ampermeter indicate "0"

one rectifier (Nl or N2) is disconnected

We should disconnect the failed generator and the rectifier. All consumers, except the blades deicing system, will operate normally.

b) Two generators СГC-40ПУ foiled.

In this case failure lights come on, voltmeter and ampermeter indicate "0", 3 rectifiers are disconnected.

Only the inverters IIO-500A and ПT-200Ц will operate from the storage batteries and supply the 1st category consumers.

We should disconnect the switches of the generators and rectifiers, set the inverters switches to the "Manual" position.

Remember: flight-time <6-7min.

If it is necessary, we can supply 1st category consumers 30 min.

The current of the generator CTГ-3 (ampermeter A-2) should not be more than 100A.

c) Storage batteries mains failed

The red light "Main is fed from st.batteries" comes on (left instrument board), make sure, lhat the voltage of the rectifier bus bar is not less than 27V, but - of the stbatteries bus bar - 24V, st.batteries ampermeter indicate discharging current. We should set the switch " Main to BY" to the "ON" position (central

panel) - light "Mains are fed from the stbatteries" goes off, the rectifiers BY-6 will supply stbatteries bus bar. Voltages of the rectifiers bas bar and storage batteries bus bar will be the same (27-29V).

d) One rectifier BУ-6failed.

In this cast; the yellow light "Connect BY-6" comes on, current "O" we should disconnect the switch of this rectifier. No limitation.

e) Two rectifier BУ-6 foiled.

We should disconnect the switches of these rectifiers, one generator, not necessary consumers. Load of the operating rectifier should not be more than 200 A.

f) Transformer 200/115v failed.

In this case the inverter IIO-500 will be switched on by automatically (light-panel "IIO-500 ON" illuminated). We should set the switch "ПO" to the "manual" position and check the voltage of the "115v" bas bar.

g) Transformer 200/36 failed.

In this cas;e the inverter IIT-200IJ will be switched on by automatically, right gyrohorizon ATБ-3K, directional system ГMK-1АЭ, autopilot AП-34Б, radio-compass APK-УД, Doppler system ДИСС-15 will not operate.

To set the «I1T» switch to the "Manual" position.

II. CONSUMERS

The helicopter power consumers are the units and devices belonging to various system, namely:

- Fire-protection system

- Deicirig system

- Lighting equipment

- Engine starting system

- Heating and ventilation system

- Fuel system

- Hydraulic system

- Outer-sling system

- Windscreen wipers

Fire-protection system

Purpose

It detects fire and eliminate it in the 4 compartments:

- left engine

- right engine

- kerosene heater KO-50

- main gear box, turbo-generator AИ-9

SET

- 42 thermocouples (14 channels) type ДПС (4 compartments)

- 3 actuating units CCП-ФK-БИ

- 2 fire-extinguishing battles (main gear box) type " 1-4-4"

- panel "Fire-protection system" (middle panel)

Main date

supply voltage =27 V ± 10%

system operates, if: T° = 150°C

V increasing = 2° /sec

Principle of operation

In case of fire, the temperature inside the compartment increases and the thermocouples give signal to the actuating unit In case if operates T° - 150°C and Viner.=2° /sec, the relay operates and switches on warning light-panel "Fire" and (he cartridge of the automatic battle №l. When the cartridge operates, the yellow light "1st battle" comes on. If the fire is extinguished, the red light "Fire" goes off in 8-10 sec.

To disconnect the light "Fire", we press the button "Fire signal disconnection". If it is necessary, we can use the bottle Ks2 by pressing the button "2nd battle". It me 1st battle is not operated automatically, we use this battle manually by means of the pressing of the "1st battle manually on" button.

Flight maintenance

-connect=27V source and CBs "Fire-protection"

-set the seletor- switch "Cartridge CHECK " to the position "1" - "2"

- yellow lights '1st battle", "2nd battle" must not be illuminated

-set me selector switch "Fire extinguishing - Fire detectors CHECK"

to the: "Fire detectors CHECK" position me light-panel 'Tire

detectors CHECK" comes on.

- check all 6 channels by means of the selector switch:

- "1" and "2" position - all 5 lights "Fire" should be ON

- "3" position - 4 lights are ON, light "KO-50 fire" is

OFF

- 4,5,6 position - lights "Main gear box: AH-9 fire" and

"Fire" (left instrument board) are ON

- set the selector switch to the "OFF' position - all lights should be

OFF

- set the switch "Fire extinguishing - Fire detectors CHECK" to the

"Fire extinguishing" position -- the light "Fire detectorss CHECK"

goes OFF

CAUTION:

1. To prevent the battles discharging don't set the switch to the " Fire

extraguishing" position, if the ''Detectors CHECK" switch is not at the "OFF"

position.

2. Don't turn the "Detectors CHECK" switch from the "OFF" position,

if the switch is at the "Fire extinguishing" position.

2. System operation Incas; of fire:

- light-panel of the corresponding compartment comes ON

- light-panel ''Fire" (left instrument board) come:* ON

- 1st battle operates - light "1st battle" comes ON

The may be 2 cases:

1st case:

- in 8-10sec light "Fire in..." goes OFF, press the button "Fire signal disconnection" - light '"Tire" goes OFF. The fore is extinguished.

2nd case:

- the light-panel "Fire in..." doesn't go OFF in 8-10sec, we should

press the button "2nd battle manual connection"

NOTE:

1. If we find the fire by visually, we should immediately press the

button "1st battle manual connection".

2. There is only one light-panel "Gear box fire AИ-9" for 3

compartments: main gear box, AИ-9, service fuel tank. In case of fire in any of

these compartments, the liquid is given to all compartments.

3. In case of fire in the kerosene heater or turbo-generator

Compartments, the fire-protection system gives a signal to disconnect the heater or

turbo-generator.

4. To disconnect the turbo-generator starting system selfblocking, we

should disconnect the CB "Signalization" for short period of time.

5. In case of fire in the engine compartment; we should act according to

the flight manual book

Deicing system

Purpose

It gives signal in case of ice formation and prevents the icing of the:

- Rotor blades

- Pilot's glass panels

- Engines

- Dust protection devices ПЗУ

Description

1. Ice detector PИO-3M

In the icing conditions, the detector-transducer (fan inlet) will be сovered with the ice, which decreases the quantity of the radioactive particles, passing to the register (tail boom section). The register connects the light-panel ICING" and the deicing devices.

2. Blades heating

Every main rotor blade has 4 section heater, every tail rotor - 2 section heater.

The program mechanism ПMK-21TB connects the sections to the generators СГС-40ПУ bus bars. The term of blades heating elements connection to the power is:

Is 1 cycle

- 38,5sec - main rotor blades

- 77sec - tail rotor blades 150 sec

3. Pilot's cabin glass panel heater

Two front glass panels of the pilot's cabin are provided with film-type electric heaters.

To maintain constant temperature of the glass panel, two thermoelectronic controllers TЭP-1M are installed in the helicopter, complete with temperature sensors TД-2. Stabilization temperature range: +25-35 °C.

The heating elements are supplied with AC 200V power source.

4. Dust protector ПЗУ heater

It is also connected to the generators СГО-40ПУ bus bars. This system сomprises 4 thermoelectronic controllers TЭP-1M, which maintain the heating temperature within 70-80 ° C.

5. Engines heating system

This system is air-heating type. The hot air is given for engine air in take from the compressor (stage 7).

Flight maintenance 1. Checking

- connect supply =27V, 200V

- make sure that: V-200-205V, MR RMP=95%

- switch on 5 CBs "Deicing system"

- set the switch "automat-manual" to the "Manual" position. 4 green

lights come On:

- Deicer On

- Right eng. heater ON

- front right ПЗУ

- back right ПЗУ

- check the current consumed with AФ-150 ammeter, using selector

switch:

- main rotor section - 60-80A (:3)

- tail rotor section - 110-150A (:6)

- glass panels - 80-120A (:6)

4 green lights indicate number connected section: -1 section

- 2 section

- 3 section

- 4 section

- disconnect the deicing system, for this set the switch "automat-

manual" to the "Automat" positiot d press the button

"Disconnection"

- switch on engines heating system manually, make sure that the green

lights 'Come on ПЗУ current consumed - 102-110A (:3) Ts t by 25-

50°C

- press the "PИO-3 heating CHECK" button - the ligfct-panel "PИO-3

heating operates" should comes ON

2. During the flight

- At t°<5°C it is necessary to switch the engines and ПЗУ dust

protector heating system after starting-up before take-off.

- If the t° air drops to 5°C during the flight make sure that there is no

ice in the air in take and switch on only, if there is no ice. Firstly we

should switch on the right engine heating system, in 50-60sec - left engine heating system, if the right engine heating system operates normally.

- At t°< 5°C and under precipitation conditions it is necessary to

switch on all deicing devices manually.

- In case of emergency icing the ice detector PИO-3 switches on

deicing system automatically, except the left engine heating system,

which should be on manually.

- We can switch on only the glass panels healing system by means of

the individual switch

LIGHTING EQUIPMENT

The lighting equipment comprises:

- navigation light БAHO-45 and XC-39

- two landing searchlights ФПП-7 (under the crew cabin)

- flash beacon MCJI-3 (tail boom)

- formation lights (tail boom)

- blade-lip lights (main rotor blades)

- red lighting system for illumination of instruments, sub-panels and

panels

- white lighting system:

- 2 dome lights (crew cabin)

- 5 dome lights (cargo cabin)

- 3 dome lights (tail boom)

- 6 dome lights blue color (cargo cabin)

- flashing system - for light warning system flashing

- signal flares (helicopter left side)

The lighting equipment are supplied with DC =27V system, except -tip lights, witch are supplied with AC

panel there are:

- signal fliers control panel

- red illumination adjust handles

On the left 3-angulars panel and right 3-angiulars panel there are 3 position switches: "Red-OFF-White" for crew cabin illumination. On the right side panel there are:

- red illumination adjusting handles

- switches:

- dim illumination

- main illumination

- navigation lights "bright-dim"

- formation lights

- blades-tip lights

- flash beacon

- flashing system

side).

- light-panels "day-night" (bright-dim)

ENGINE STARTING SYSTEM

Turbo-generator AИ-9 starting system It comprises:

- starting panel АПД-9B

- starter CTГ-3

- ignition coil KP-12CИ

- spark-plug CД-55AHM

- fuel electrical valve 610200A

- fuel electrical pump 726

- normal RMP signalizer

- max RMP signalizer

- oil pressure signalizer MCTB-2

Fuses and commutators are located in the distribution box (tail boom,

Control panel is on the middle panel.

AИ-9 starting

- connect 2CB "Turbounit"

- set 3 position switch (control panel) to the "starting" position

- press the "starting" button - light "Antarctic ON" comes on

- starting panel АПД-9B will start-up the turbo unit:

- Is - fuel valve opens

- 3s - fuel pump (starting):

- valve Nl

- ignition coil

- CTГ-3 (decreasing V}

- 6s - switched on valves N2. N3

- 6,5s - GTГ-3 receives foil voltage V

- main fuel pump is connected

- 12s disconnect starting fuel pump, valves Nl and N2,

ignition coil

- 20s - lights "normal RPM", "normal oil pressure" comes on

- 30s - AПД-9B is returned to the initial position, light

"Automatic ON" goes off

If the RPM reaches max permissible RPM, the turbounit coil will be

lopped automatically, red light "RPM max" comes on.

We can interrupt the starting with the pressing of the "OFF AИ-9

button

There are also "Cold cranking" and "False Starting" ratings.

Helicopter engines starting system. It comprises: -starting panel AИ-78

- ignition unit CK-22-2K

- spark - plug CП-26П3T

- centrifugal switch A812A

- air electrical valve.

Starting

- switch on 2 CBs "Engines start-up"

- set the switch "Left-right" to the necessary position

- set the switch "Start-up-Cranking" to the "Start-up" position

- press the button "Start" - green light-panel "Automatic on" comes on

Starting panel AДП-78 will start-up the engine automatically:

- Is - compressed air is given, green light "starter operates", comes on

- 5s - igniter unit is on

- 17-19s - fuel is given

- 30s - igniter unit is off

- 55s - (RPM 55-60%) - light "Starter operates" goes off

- 60s - programs mechanism is returned to the initial position, light

"Automatic on" goes off.

Notes:

1. If nte 55-60% earlier then 55sec, the centrifugal switch finishes the

starting process earlier.

2. We can interrupt the starting process manually with button "Start

interrupt".

Cold cranking

It has the following features:

- the switch "Start - Cranking" is set to the "Cranking" position

- only air starter operates

- cranking time - 60sec

- cranking RPM 20-26%

HEATINGH AND VENTILATlON SYSTEM.

Kerosene heater KO-50

Purpose

It is used for helicopter cabin heating and ventilation.

Description.

KO-50 is an air heater operating on the principle- of permanent "Fuel-air mixture"" burning in the combustion chamber. Fuel is supplied with fuel pump W8. The electrical ran MB-1200 supplies air from the atmosphere or cargo cabin (racirculation rating). It depends upon shutter position, which is controlled from toe cargo cabin (starboard) KO-50 is composed of:

starting coil KB-112 and QJ-96 spark plug for ignition

fuel heater, heating the kerosene to+70°C while starting.

cargo cabin T° automatic regulation system, consisting of t°

detectors, electronic block and fuel supply to the jet adjusting valves.

"KO-50 t° selector" (right panel) is used for t° adjusting from 10 to

30°C

supply voltage

power

fuel consumption

heating productivity

Main data =27V =2,5KW 8kg/hot>r 50 000 Kcal/hour

Flight maintenance

1. KO-50 is used at t° < 10°C in automatic mode, when the air t° is maintained automatically. In case of the automatic mode fail, the manual mode is used.

2. KO-50 starting:

- set the switch "Auto-manual" to the position "Auto", fuel cut off

valve will be opened, fuel pump 748 will be operating

- set the "t° selector" to +30°C

- press the "Starting" button and switch on the stopwatch. Light panel

"Fuel heating" will be one. After this KO-50 will be starting

automatically

- at fuel t=70°C, the thermoswitch disconnects the fuel heating and

switches on the ignition and fan MB-1200. Light panel "Ignition" is

ON

air pressure operated relay switches on the fuel valve, supplying fuel to the jet light panel "KO-50 operates normally" is ON

- in 2 min max, the Light panel" Ignition" should be off in case the air

t° at KO-50 outlet is 40°C. If not, it is necessary to switch off KO-50

3. During the flight to set the "Selector t°" to t° necessary for flight and

check KO-50 operations by means of the light-panel "KO-50

operates normally" and TB-19 thermometer.

4. Main failures.

a) "Auto" mode failed: thermometer readings will be not corresponding

to the *", set with **t° selector". It is necessary to switch off KO-50

and after 0-l5min switch it on manually, in such a case, if t° Ј -

13°C, switch on "max" mode, when t° 2? -P°O - "Average" mode

with modes selector switch. KO-50 will produce maximum or

average quantity of heat.

b) Fan felled: the air pressure decreases and the pneumatic relay

switches off the fuel valve, supplying fuel to the jet. Light-panel

"KO-50 operates normally" goes off. We should switch off the kerosene heater.

c) Air t° at KO-50 outlet reaches 175°C - the thermoswitch operates

and disconnects the kerosene heater. We should switch off the heater

manually.

d) Fire in the KO-50 compartment" fire protection system gives the

signal, to disconnect the heater automatically.

5. KO-50 switching OFF

In case of failure and before landing we should switch off the kerosene

heater, setting the switch "Auto-manual" to the "neutral" position. All KO-50 units will be off, except the fan, which ensures the combustion chamber blowing up and KO-50 cooling. When air t° at KO-50 outlet decreases to +50°C, the thermoswitch disconnects the fen automatically.

ATTENTION

- The fen MB-1200 may be used for helicopter cooling, when it is hot.

For this we set the switch "Fan" to the "ON" position.

- Before KO-50 starting in case the fuel was previously drained, refuel

it, setting the selector switch to the position 'Refueling" (not more

than 4rnin). After that, it is necessary make the pause - l-2min for

fuel draining from the combustion chamber.

- Don't use the "Auto" mode when the helicopter doors are opened.

- During the fire-protection system checking don't use the heater.

- Start KO-50 only using "Recirculation" mode of operation.

- Use the "Recirculation" mode, when there is the icing.

FUEL SYSTEM

It comprises:

a) 3 electrical fuel pumps:

- service tank - unit 463

- external tanks - ЭЦH-91Б (2pcs)

c) fuel valves 768 600

Fuel pumps

a) ЭЦН-91Б (2pcs) - are located in the external tanks and supply fuel

to me service tank:

- V=27V±10%

- I=7A

b) unit 463 - is located in the service tank and pumps the fuel to the

engines:

- V= 27V ± 10%

- I=17A

- Q= 400 I/hour

- P= 1.2kgf7cm2

c) flight maintenance

- switch on 3 CB "Fuel tanks pumps"

- set the 3 switches " Fuel pumps" (middle panel) to the "ON" position

(Up)

- 3 lights panel will indicate the fuel pump operation by means of the 3

fuel pressure signalizers type СД-29A

- when the pump failed or the fuel is finished, the corresponding light

does off

Fuel valves There are 5 electrical fuel valves, type 768 600:

- engines shut-off valves (2pcs)

- fuel by-pass valves (3pcs)

The engine shut-off valves cut off the fuel supply to the engines. Before engines starting, open shut-off valves with their switches "Shut-off valves" (middle panel) in up position. The light-panel under the switches with inscriptions "Left closed", "Right closed" will be off.

In case of fire in the engine compartments and after landing shut-off valves should be shut down.

The fuel by-pass valve should be normally closed. In case of floating valve of the service tank failed, it is necessary to open fuel by-pass valve with the switch "By-pass system" (middle panel), which we set to the "Open" position. Shut down the valve, when fuel amount in the service tank is equal 4201. Open the valve again, when fuel amount decreases to 3001.

There are CBs "Shut-off valves" and "By-pass valve'* for the circuit protection.

The external tanks fuel system has two fuel by-pass valves: forward and backward. They connect the pipeline of the external tanks. On the fuel panel there is switch "By-pass valve", which usually should be in the "Open" position (up). When we set this switch to the position "Close'* (down), the light-panel "Valve closed" comes on.

HYDRAULIC SYSTEM.

The main and duplicating hydraulic systems consist of:

- 2 valves ГA-74M/5

- 5 valves ГA-192/2

a) Valves ГA-74M/5.

They connect the hydraulic boosters to the respective hydraulic system.

The valve is composed of 2solenoid coils: one-for connection, another -for disconnection.

The valve coil is selfdienergised by means of the micro switch at the end

of valve stroke: - V=27v±10%

- J=10A, max

There are 2CBs "Hydraulic system" and 2 switches "main" and "Duplicating" (middle panel). They should be switched on before engines starting. When the hydraulic fluid pressure will increase during the engine starting the duplicating system will be connected- pressure signalizes will switch on the light "Duplicating on". After the engines starting, we press the button "Duplicating disconnection". In this case the duplicating system is switched off, but the main system is switched on. The light "Duplicating on" goes off; but the light "main on" comes on. In case of the main hydraulic system failed, the duplicating system will be switched on automatically. The pilot must switch off the main hydraulic system switch and perform the emergency landing.

b) Valves ГA -192/2

- 3 valves switch on the hydraulic system of the autopilot in the mode

of "Stabilization".

- 1 valve is switched on with "Friction" buttons and ensures the

"Collective pitch levers" brakes release.

- 1 valve controls the hydraulic stopper mechanism, which protects the main rotor blades from bumping against tail boom, while the helicopter is on the ground. It is switched on by micro switches on the main struts of landing gear. They switch off this system, when the helicopter is taking off.

The valve, ГA-192/2 is composed of coil and spring, which move the slide valve to the "on" or "off" position.

EXTERNAL SLING ELECTRICAL EQUIPMENT.

The external lock is composed of two coils, which open the lock. The coils switched on with the press buttons "Tactical release" (current 6A) and "Emergency release" (9.5 A), the lock may be released automatically in case of the switch "Ex. sling auto release" is switched on and in case of the load carried on the external sling is touching the ground (the cable is reduced and the micro switch gives the signal for lock opening) - light panel "Lock opened" comes on. There are 2CBs "open lock controlling".

The buttons 'Tactical release" and "Emergency release" are located on the left collective pitch lever.

The switch "Ex. sling auto release" and light "Lock opened" are located on the left side pane!

PILOTS CABIN FANS JB-3Q2TA. They ensure air circulation in the pilot's cabin

- V-27v±l0%

- I=0.8A

The fans are switched on with the switches "Fan" (left and right electric boards).

WINDSCREEN WIPERS

They are designed for mechanical wiping of precipitation, which are started by electric actuators ЭПК-2T-60.

- V=27V±10%

- I=2.6A

- Ist speed - 64-90 double turns/min

- 2nd speed ~ 38-60 double turns/min

Flight maintenance

- switch on 2 CBs "Windscreen wipers"

- set the " Windscreen wipers" switch (left and right 3-angulai panels)

to the position "Start", if the air temperature is:

- +30 - -20°C - not more 5 min

- below -20°C - not more 30min

man change it over to the I speed

- if the air temperature above -20°C we may switch on just to the 1st or

2nd speed

- for the switching off set the 5th position switch to the "OFF' position

- if after the electric actuator is t° switched off, the wiper blade stops

so that it hinders observation for the pilot, the wiper blade can be

moved to the extreme position, pressing the 5th position switch to the

"Reset" position.

Дата добавления: 2015-08-28