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HSM-72 HAC > Hydraulic > Flashcards

Hydraulic Flashcards

1
Q

All components of the hydraulics system receive __________ with the exception of _________ which receives ___________.

A

3000 psi

Pitch and roll trim actuators

1000 psi

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2
Q

The backup Hyd pump is________ driven.

A

Electric motor

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3
Q

If there is a BACKUP PUMP PWR circuit breaker out and a condition exsists that requires the pump to operate then ________

A

The system must be configured so that the backup pump will not come on when you reset the CB or

AC power must be secured prior to resetting the the CB.

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4
Q

Backup pump initiation with AFCS heading hold engaged may cause?

A

Heading hold failure. Can be reset by pressing the cubes.

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5
Q

FLIR may fail if ___________

A

Backup hyd pump is turned on with FLIR operating.

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6
Q

The Backup HYD pump will turn on in _______ if on ________ or ____ if on ________.

A

4 seconds, APU or EXT power

.5 seconds, if either main generator is running.

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7
Q

With WOW and Backup HYD Pump in OFF, ON, and AUTO?

A

OFF- pump is off.

ON- pump recirculates fluid to and from each transfer module and maintains pressure in the APU accumulator and rescue hoist systems, as required.

AUTO- pump automatically maintains Hyd pressure to the No. 1 and/or No. 2 Hyd systems, including the second stage of the tail rotor servo (as required for hyd system pressure and/or fluid losses detected by the LDI)

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8
Q

Without the WOW and the back up pump in OFF/AUTO, and ON?

A

OFF/AUTO- pump automatically maintains Hyd pressure to the No. 1 and/or No. 2 Hyd systems, including the second stage of the tail rotor servo (as required for hyd system pressure and/or fluid losses detected by the LDI)

ON- pump recirculates fluid to and from each transfer module and maintains pressure in the APU accumulator and rescue hoist systems, as required.

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9
Q

When APU accum px is low and Backup is activated the pump will run for_____

A

90 seconds (180 seconds w/winterization kit), regardless of switch position.

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10
Q

Conditions that cause automatic backup pump module operation to be initiated:

A
  • # 1 HYD PUMP
  • # 2 HYD PUMP
  • # 1 RSVR LOW
  • # 1 TAIL RTR SERVO
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11
Q

Utility module routes backup Hyd fluid to the _________

A

No. 1 and 2 transfer modules

2nd stage of the tail rotor servo

Rescue hoist

APU accum

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12
Q

The priority valve will do what?

A

Will restrict hydraulic fluid to the rescue hoist in the event that back up hydraulic pressure decreases below a prescribed value.

It’s located between the utility module and the rescue hoist

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13
Q

The velocity fuse will?

A

Secure hydraulic fluid to APU accumulator if the flow rate exceeds a prescribed limit.

It’s located between the utility module and the APU

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14
Q

How do you reset the LDI logic?

A

Cycling the HYD LEAK TEST switch

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15
Q

What 5 thing do you need for the HYD LEAK TEST?

BARWA

A
  • BACKUP PUMP AUTO
  • AC power
  • Rotors engaged
  • WOW
  • All reservoirs full
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16
Q

What lights indicate a good HYD LEAK TEST?

A
  • 3 RSVR LOW = #1/#2 and BACKUP
  • SAS
  • BOOST SERVO OFF
  • AFCS DEGRADED
  • # 1 TAIL RTR SERVO
  • # 2 TAIL RTR SERVO ON
  • BACKUP PUMP ON
  • MASTER CAUTION
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17
Q

Utility pump system numbers and note?

A

1000 psi with switch OFF
3000 psi with switch ON

When not required, utility pump should be off.

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18
Q

Hydraulic system components:

A 
Three identical and interchangeable Hyd pumps
Two Transfer Modules
One Utility Module
Three dual-stage primary servos
tail rotor servos
Pilot-assist servo assembly
APU accumulator
Rescue hoist
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19
Q

When does the HYD warning illuminate?

A

When the hydraulic system is severely degraded as a result of several compound malfunctions involving the No. 1, No. 2, and backup hydraulic systems

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20
Q

No. 1 and No. 2 Hydraulic system operate with ___.

A

Rotors turning

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21
Q

No. 1 Hyd system components

A

No. 1 Hyd pump
No. 1 Transfer module
First stage of the Primary servos
First stage of the tail rotor servo

22
Q

Where is the No. 1 Hyd pump and what is it driven by?

A

Mounted on, and driven by, the left accessory module.

23
Q

Of the pressure and return filters, which can be bypassed, and which can’t?

A

The Pressure filter has no bypass valve, but the Return filter does

24
Q

When do you get the #1/#2 RSVR LOW caution?

A

When the automatic low-level sensing switch, mounted on top of the pump, closes.

25
Q

What is the job of the Transfer module?

A

It routes hydraulic fluid from the Hyd pumps to the primary servos and the (#1)first stage of the tail rotor servo or the (#2) Pilot-assist servo assembly. It also automatically routes hyd fluid from the backup pump if hyd pressure is lost.

26
Q

What are the components of the No. 1 transfer module?

A

Transfer/shuttle valve, pressure switch, first-stage primary servo shutoff valve, and first-stage tail rotor servo shutoff valve.

27
Q

What does the Transfer/shuttle valve do?

A

If Hyd system pressure is lost, it routes backup pump hyd fluid to the primary servos and the (#1)first stage of the tail rotor servo or the (#2) Pilot-assist servo assembly

28
Q

What does the pressure switch do?

A

It illuminates the #1/#2 HYD PUMP caution and sends a signal to the LDI when hyd pump pressure drops below a prescribed limit.

29
Q

Where is the No. 2 Hyd pump and what is it driven by?

A

Mounted on, and driven by, the right accessory module.

30
Q

No. 2 Hyd System components

A

No. 2 Hyd pump
No. 2 Transfer module
Second-stage primary servos
Pilot-assist servo assembly

31
Q

How can you secure the Hyd pressure to the pitch and roll trim actuators?

A

by depressing the TRIM pushbutton on the AFCS CONTROL panel.

32
Q

How can you secure the Hyd pressure to the boost servos (collective, pitch, yaw) and Stability Augmentation System (SAS) actuators?

A

By depressing the SAS/BOOST pushbutton on the AFCS CONTROL panel.

33
Q

What does the electrical interlock in the primary servos do?

A

It prevents you from securing the hyd pressure to both Primary servo stages simultaneously, and, in the event of a malfunctioning stage, precludes accidentally securing the operable stage

34
Q

The backup Hyd system supplies hyd pressure to the No. 1 and No. 2 Hyd systems ____, and provides hyd pressure to the _____ and _____.

A

Prior to rotor engagement
Rescue Hoist system
Recharges the APU accumulator

35
Q

When the backup pump is supplying pressure to the #2 tail rotor servo, the ____ may secure hyd pressure to the rescue hoist due to low system pressure.

A

Priority Valve

36
Q

If there is a leak in the No. 1 Hyd system, where does the LDI system assume the leak is?

In the No. 2 Hyd system?

A

First stage of the tail rotor servo.

Pilot-assist servo assembly

37
Q

What does the utility hyd system do?

A

Independently operates the sonar reeling machine.

Operates only when the main transmission is turning

38
Q

What does the hyd leak test check?

A

All hyd circuitry except transfer/shuttle valve operation

39
Q

System is designed to operate as a

A

dual-isolation distribution system

40
Q

How is redundancy accomplished?

A

via electric motor-driven backup pump

41
Q

Utility hyd pump provides px for

A

sonar reeling machine

42
Q

No 1 hyd system operates with

A

rotors turning

43
Q

What prevents securing of hyd px to both stages simultaneously (even if one side is malfunctioning)

A

electrical interlock

44
Q

backup hyd system provides px to hyd systems

A

before rotor engagement

45
Q

Backup hyd system provides px to

A

rescue hoist system, recharges APU accum

46
Q

what causes BACKUP RSVR LOW caution to appear?

A

automatic low-level sensing switch mounted on top of the pump

47
Q

applying power to backup pump causes a startup power transient to ___ power, possibly resulting in low power alert for __

A

400 Hz, radar

48
Q

TAIL SERVO switch positions

A

NORM - first stage of TR servo is powered by No 1 hyd system

BKUP - backup pump pressurizes second stage of TR servo via utility module

49
Q

utility hyd pump energized

A

closes bypass valve which increases px to 3000 psi for sonar reeling machine operation

50
Q

Utility hyd pump operates only when

A

main transmission is turning

HSM-72 HAC (47 decks)

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