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Systems > HYDS > Flashcards

HYDS Flashcards

1
Q

What systems do the three hydraulic pumps provide pressure to?

A

Flight control system, APU system, rescue hoist system

The hydraulic pumps are essential for various operational components in these systems.

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2
Q

What is the typical hydraulic pressure supplied by the hydraulic pumps / whats actuators are the exceptation to the rule?
-> Where are they located?
–> What’s there PSI?

A

Approximately 3,000 psi

The exception is the pitch and roll trim actuators in the pilot-assist servo assembly, which operate at 1,000 psi.

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3
Q

True or False: Each hydraulic system can operate independently of the others.

A

True

The systems are designed to be redundant and can function autonomously.

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3
Q

What does the Leak Detection/Isolation (LDI) system assist with?

A

Isolation of hydraulic leaks

This system plays a critical role in maintaining hydraulic integrity.

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4
Q

What happens when the hydraulic system is severely degraded?

A

The HYD warning will illuminate

This indicates multiple compound malfunctions in the hydraulic systems.

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5
Q

What components make up the No. 1 hydraulic system?

A
  • No. 1 hydraulic pump
  • No. 1 transfer module
  • First stage of the primary servos
  • First stage of the tail rotor servo

The No. 1 hydraulic system is crucial for rotor operation.

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6
Q

Fill in the blank: The pressure relief and bleed valves protect the pumps from _______.

A

[high pressure in the return system]

These valves are critical for safe operation.

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7
Q

What indicators are marked on the level-indicator window of the reservoir? AKA what are do the colors mean on the Hyd Pump

A
  • Underserviced (red)
  • Normal (green)
  • Overserviced (blue)

These indicators help in monitoring hydraulic fluid levels.

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8
Q

What occurs when the automatic low-level sensing switch detects low fluid levels on the #1 side specifcally? ( Think Caution)

A

1 RSVR LOW caution appears

This alerts the operator to potential issues in the hydraulic system.

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9
Q

What does the No. 1 transfer module do?

A

Routes hydraulic fluid from the No. 1 hydraulic pump to servos

It ensures proper distribution of hydraulic fluid.

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10
Q

What happens if No. 1 hydraulic system pressure is lost?

A

The transfer/shuttle valve routes backup pump hydraulic fluid

This maintains functionality of the servos.

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11
Q

What is the role of the pressure switch in the No. 1 transfer module?

A

Illuminates the #1 HYD PUMP caution and signals LDI

This is essential for monitoring system pressure.

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12
Q

What does the No. 2 hydraulic system supply hydraulic pressure to?

A

The second stage of the primary servos and the pilot-assist servo assembly

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13
Q

What are the main components of the No. 2 hydraulic system?

A
  • No. 2 hydraulic pump
  • No. 2 transfer module
  • Second-stage primary servos
  • Pilot-assist servo assembly
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14
Q

What happens when the fluid level is low in the No. 2 hydraulic pump? ( Think cautions)

A

2 RSVR LOW caution appears

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15
Q

What is the function of the No. 2 transfer module?

A

Routes hydraulic fluid from the No. 2 hydraulic pump to the second stage of the primary servos and the pilot-assist servo assembly

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16
Q

How can hydraulic pressure to the pitch and roll trim actuators be secured?

A

By depressing the TRIM pushbutton on the AFCS CONTROL panel

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17
Q

What hydraulic pressure is approximately secured to the pitch and roll trim actuators?

A

Approximately 1,000 psi

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18
Q

What hydraulic pressure is approximately secured to the boost servos and SAS actuators?

A

Approximately 3,000 psi

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19
Q

How is hydraulic pressure to the boost servos secured?

A

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

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20
Q

What is the function of the SERVO switches?

A

Secure hydraulic pressure to an improperly operating primary servo stage

There are two switches, one on each collective.

21
Q

What happens when either 1ST OFF or 2ND OFF is selected?

A

The associated servo shutoff valve is energized closed and hydraulic pressure to the respective stage is secured.

22
Q

What is the purpose of the electrical interlock?

A

Precludes the securing of hydraulic pressure to both first and second stages simultaneously.

23
Q

What does the backup hydraulic system supply?

A

Hydraulic pressure to the No. 1 and No. 2 hydraulic systems

24
Q

The backup hydraulic system is what source to the rescue hoist system?

A

The only source of hydraulic pressure.

25
Q

What occurs if the BACKUP PUMP PWR circuit breaker is out and the backup pump is needed?

A

The hydraulic system must be configured so that the backup pump will not activate upon resetting the circuit breaker.

26
Q

True or False: Backup pump initiation with AFCS heading hold engaged may cause AFCS heading hold failure.

A

True

27
Q

What is the backup hydraulic pump powered by?

A

An ac electric motor.

28
Q

What happens when the automatic low-level sensing switch closes? Can be worded better

A

The BACK UP RSVR LOW caution appears.

29
Q

What does the backup pump do in the ON position with weight on wheels?

A

Recirculates hydraulic fluid and maintains pressure in the APU accumulator and rescue hoist systems.

30
Q

What does the backup pump do in the AUTO position with weight off wheels?

A

Automatically maintains hydraulic pressure to the No. 1 and/or No. 2 hydraulic systems.

31
Q

What happens when the APU accumulator pressure is low and the backup pump is activated?

A

The backup pump will run for at least 90 seconds regardless of BACKUP HYD PMP switch position.

32
Q

What initiates automatic backup pump module operation?

A

The LDI system when a loss of hydraulic fluid and/or pressure is sensed.

33
Q

List the conditions that activate thr automatic backup pump

A
  • Loss of No. 1 hydraulic pump pressure
  • Loss of No. 2 hydraulic pump pressure
  • Loss of No. 1 hydraulic reservoir fluid
  • Loss of pressure to the first stage of tail rotor servo
34
Q

What is the function of the utility module in the hydraulic system?

A

Routes hydraulic fluid from the backup hydraulic pump to various components including the No. 1 and No. 2 transfer modules, second stage of the tail rotor servo, rescue hoist, and APU accumulator.

35
Q

What is the role of the priority valve in the utility module?

A

Restricts hydraulic fluid to the rescue hoist if backup hydraulic pressure decreases below a prescribed value.

36
Q

What does the velocity fuse in the utility module do?

A

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

37
Q

What triggers the BACKUP PUMP ON advisory?

A

A pressure switch in the utility module senses backup hydraulic pump output pressure and closes a circuit if pressure is above a prescribed value.

38
Q

In the NORM position, which hydraulic system powers the first stage of the tail rotor servo?

A

The No. 1 hydraulic system.

39
Q

What happens in the BKUP position of the TAIL SERVO switch?

A

The backup pump pressurizes the second stage of the tail rotor servo via the utility module.

40
Q

How can the backup pump supply hydraulic pressure to the tail rotor servo?

A

Automatically if the No. 1 hydraulic system malfunctions or manually if the TAIL SERVO switch is placed in the BKUP position.

41
Q

What is indicated by a loss of hydraulic pressure in the first stage of the tail rotor servo? ( Think Caution)

A

1 TAIL RTR SERVO caution.

42
Q

What does the #2 TAIL RTR SERVO ON advisory indicate?

A

Pressurization of the second stage of the tail rotor servo.

43
Q

What components does the LDI system incorporate?

A

Two logic modules that receive inputs from automatic low-level sensing and pressure switches.

44
Q

What does the LDI system do if the leak is in the No. 2 hydraulic system?

A

It assumes the leak is in the pilot-assist servo assembly and secures hydraulic pressure to that assembly.

45
Q

What must the pilot do if the leak continues after initial isolation?

A

The pilot must secure the affected primary servo using the SERVO switch.

46
Q

What criteria must exist to initiate the hydraulic leak test?

A
  1. AC power
  2. BACKUP HYD PMP switch in AUTO position
  3. All hydraulic reservoirs full
  4. Weight On Wheels
  5. Rotors engaged
47
Q

What is indicated by a satisfactory hydraulic leak test?

A

The appearance of the following cautions/advisories:
* #1 RSVR LOW
* #2 RSVR LOW
* BACK UP RSVR LOW
* SAS
* BOOST SERVO OFF
* AFCS DEGRADED
* #1 TAIL RTR SERVO
* #2 TAIL RTR SERVO ON
* BACKUP PUMP ON
* MASTER CAUTION

48
Q

What must be done to restore normal operation to the hydraulic leak detection system after a leak test?

A

The HYD LEAK TEST switch must be placed to RESET momentarily, then back to NORM.

49
Q

Fill in the blank: The LDI system assumes that if a leak is detected in the No. 1 hydraulic system, the leak is in the _______.

A

first stage of the tail rotor servo.

50
Q

When does the utility system operate?

A

Only when the main transmission is turning

51
Q

What is the pressure of the system when it is deenergized?

A

1,000 psi

Systems (10 decks)

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