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AW139 - Updated 27/08/24 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

When is the Hydraulic Utilities Shut-Off Valve (SOV) closed?

A

When there is an oil leak (automatically when there is an oil leak)

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2
Q

When setting the Shut-Off Valve (SOV) 1 switch on the Hydraulic Control Panel to CLOSE, what cautions are displayed?

A

1 SERVO, 1 HYD OIL PRESS

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3
Q

When setting the Shut-Off Valve (SOV) 2 switch on the Hydraulic Control Panel to CLOSE, what cautions are displayed?

A

2 SERVO, 2 HYD OIL PRESS

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4
Q

In case of failure of Hydraulic Pump #2, what cautions are displayed?

A

2 HYD PUMP

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5
Q

In case of failure of Hydraulic Pump No.1, what cautions are displayed?

A

1 HYD PUMP, 1 SERVO, 1 HYD OIL PRESS, EMERG LDG PRESS

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6
Q

What is the effective recovering action after receiving a HYD UTIL PRESS caution?

A

SOV 1 and SOV 2 switches on the Hydraulic Control Panel are ineffective (are not relevant to recovery the malfunction)

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7
Q

What would be the pressure indication on the Hydraulic System #1, with the Hydraulic Control Panel Shut-Off Valve (SOV) #1 set to CLOSE ?

A

About 207 bar

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8
Q

What condition will allow the Shut-Off Valve (SOV) 1 to CLOSE?

A

Tail Rotor Shut-Off Valve (TRSOV) valve is open

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9
Q

What is the main function of the Hydraulic Electric Pump?

A

Provides flight controls freedom of movement check

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10
Q

Which caution could be displayed with the 1 SERVO caution?

A

EMER LDG PRESS in case of loss of pressure on the system

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11
Q

Which of the following conditions could illuminate the 2 SERVO caution ?

A

The control valve in a servoactuator is jammed or loss of pressure on the system

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12
Q

After setting the SOV switch on the Hydraulic Control Panel to No.1 CLOSE, what cautions are displayed?

A

1 SERVO, 1 HYD OIL PRESS

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13
Q

If the SOV 1 switch on the Hydraulic Control Panel has been set to CLOSE and there is a subsequent drop of pressure on system 2:

A

The SOV switch is automatically reset

Pressure on system 1 is reinstated

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14
Q

On PCM 1 the utilities shut-off valve is closed by the following microswitch(es):

A

MIN (22%)

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15
Q

TRSOV in the Hydraulic Circuit 2 is closed by the following microswitch(es) in the PCM 2 reservoir:

A

LOW 2 (28%)

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16
Q

On PCM 1 the utilities shutt-off valve is closed by the following microswitch(es):

A

MIN (22%)

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17
Q

LOW 2 (28%) microswitch in the PCM 2 provides the following:

A

Opens utilities shut-off, closes TRSOV

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18
Q

The hydraulic Electrical Pump:

A

Is provided with an overheating switch

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19
Q

Once pressed the ON pushbutton to operate the hydraulic Electrical Pump, the pushbutton:

A

Is automatically switched off after two minutes

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20
Q

When setting SOV 1 switch on the Hydraulic Control Panel to CLOSE, the pressure indicator 1 on MFD shows:

A

About 207 bar

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21
Q

In case of total loss of pressure on hydraulic system 2:

A

The cautions HYD UTIL PRESS and SERVO are lit on

Extend landing gear using EMER DOWN switch on Landing Gear Control Panel and land as soon as practicable

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22
Q

In case of HYD UTIL PRESS caution:

A

SOV 1 and SOV 2 switches on the Hydraulic Control Panel are ineffective

23
Q

In case of 1 HYD OIL TEMP caution:

A

Lower landing gear and set SOV 1 switch on Hydraulic Control Panel to CLOSE

24
Q

In case of 2 HYD OIL TEMP caution:

A

Lower landing gear, set SOV 2 switch on the Hydraulic Control Panel to CLOSE, land as soon as practicable

25
Q

The SOV 1 switch on the Hydraulic Control Panel can be set to CLOSE if the following cautions are lit:

A

1 HYD OIL TEMP

26
Q

SOV 1 switch on the Hydraulic Control Panel can be set to CLOSE only if:

A

TRSOV valve is open

27
Q

When setting SOV 1 switch on the Hydraulic Control Panel to CLOSE, the following cautions are lit on:

A

1 SERVO, 1 HYD OIL PRESS

28
Q

When setting SOV 2 switch on the Hydraulic Control Panel to CLOSE, the following cautions are lit on:

A

2 SERVO, 2 HYD OIL PRESS

29
Q

In case of failure of pump 2 on Hydraulic System 2, the following cautions are lit on:

A

2 HYD PUMP

30
Q

In case of failure of pump 1 on Hydraulic System 1, the following cautions are lit on:

A

1 HYD PUMP, 1 SERVO, 1 HYD OIL PRESS, EMERG LDG PRESS

31
Q

The Hydraulic circuit 2 is losing oil. After some time you would expect to see:

A

The caution HYD UTIL PRESS and then the caution 2 SERVO

32
Q

The Hydraulic circuit 1 is losing oil. After some time you would expect to see:

A

The caution EMER LDG PRESS together with the caution 1 HYD MIN

33
Q

The Hydraulic circuit 2 is losing oil. After some time you would expect to see the following cautions:

A

HYD UTIL PRESS appears, then 2 SERVO appears and HYD UTIL PRESS disappears, then HYD UTIL PRESS appears together with 2 HYD MIN

34
Q

If the SOV 1 switch on the Hydraulic Control Panel has been set to CLOSE and there is a subsequent droop of pressure on system 2.

A

The SOV switch is not automatically reset

35
Q

If the SOV 1 switch on the Hydraulic Control Panel has been set to CLOSE and there is a subsequent drop of pressure on system 2:

A

The SOV switch is automatically reset

Pressure on system 1 is reinstated

36
Q

If the caution 1 HYD MIN is lit on you could set to CLOSE on the Hydraulic Control Panel:

A

The SOV 1 switch

37
Q

If the caution 2 HYD MIN is lit on you could set to CLOSE on the Hydraulic Control Panel:

A

The SOV 2 switch

38
Q

SERVO caution is provided when the servoactuator main spool valve is jammed in the center and:

A

Flight controls are operated

39
Q

The microswitch on servoactuator is operated when:

A

A main spool valve is jammed together with a low pressure condition in the hydraulic circuit

40
Q

In case of 2 SERVO caution:

A

Control valve in a servoactuator is jammed or loss of pressure on the system

Tail Rotor Shut-Off Valve is closed or SOV 2 switch on the Hydraulic Control Panel is set to CLOSE

41
Q

In case of 1 SERVO caution:

A

Control valve in a servoactuator is jammed or loss of pressure on the system

42
Q

The 2 SERVO caution could be lit together with:

A

2 HYD MIN

43
Q

The 1 SERVO caution could be lit together with:

A

EMER LDG PRESS in case of loss of pressure on the system

44
Q

The SOV 2 CLOSE selection on the Hydraulic System Control Panel is:

A

Inhibited if the flight control actuators low pressure exists in the hydraulic system no. 1

45
Q

The PRESS amber legend of the HYD 1 indicator on the Hydraulic System Control Panel is lit when:

A

The hydraulic pressure drops below a predetermined value together with the cautions 1 HYD PRESS, the SERVO and the EMERG L/G PRESS and 1 HYD PUMP

46
Q

The Hydraulic circuit 1 is losing oil. After some time you would expect to see the following cautions:

A

EMER LDG PRESS appears together with 1 HYD MIN , then 1 SERVO appears

47
Q

When setting SOV switch on the Hydraulic Control Panel to CLOSE:

A

Utilities shut-off valve remains open

48
Q

The microswitch on servoactuators is operated when:

A

A main spool valve is jamed together with a low pressure condition in the hydraulic circuit

49
Q

** WARNING **

if 1 (2) HYD TEMP

with

2 (1) SERVO

???

A

Do NOT switsh SOV on unaffected system!

This will cause loss of control in the affected servo jack

50
Q

When the#2 hyd level drops below 50%, what will happen?

A
51
Q

When the #2 hyd level drops below 28%, what will happen?

A
52
Q

When the #2 hyd level drops below 22%, what will happen?

A
53
Q

When the #1 hyd level drops below 22%, what will happen?

A

AW139 - Updated 27/08/24 (18 decks)

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