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MV-22 Osprey > Hydraulic System > Flashcards

Hydraulic System Flashcards

0
Q

What is the normal operating range for each HYD system?

A

4600 < 5250 psi

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1
Q

Each HYD system operates at a pressure of approximately _____ psi.

A

5,000

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2
Q

What 11 components are part of the HYD 3 utility system?

A
  1. Engine start system
  2. EAPS blowers
  3. Rotor brake
  4. Cargo ramp/door actuators
  5. Landing gear actuators
  6. Wheel brakes
  7. Nose wheel steering
  8. Rotor positioning unit
  9. Wing stow system
  10. Aerial refueling retractable probe
  11. Cargo winch
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3
Q

Where are the HYD 1/2 pumps located?

A

On their respective TAGB

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4
Q

The HYD pumps deliver ___ GPM in VTOL mode and ___ GPM IN APLN.

A

38

32

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5
Q

How is HYD fluid cooled?

A

Through the nacelle heat exchanger.

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6
Q

What do the flight control modules do?

A 
Supply low pressure fluid to the pump
Store fluid displaced by actuating components
Filter pressurized and return fluid
Dampen pressure fluctuations
Sense and limit system pressure
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7
Q

The temperature switch signals the appropriate FCC to illuminate a caution whenever a HYD system fluid temperature reaches ___ °C.

A

121

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8
Q

The reservoir has a capacity of ___ cubic inches of HYD fluid.

A

330

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9
Q

The accumulator has a ___ cubic inch capacity.

A

12

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10
Q

The relief valve limits the pressure to a maximum of _____ psig.

A

5,850

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11
Q

The HYD 1/2 pumps pressurize their respective systems at ___ Nr.

A

58%

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12
Q

The thermal control valves are used to rapidly warm up the hydraulic fluid temperature is below ___ °C

A

4

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13
Q

HYD 3 is located on and driven by the _____

A

MWGB

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14
Q

The HYD 3 reservoir has a capacity of ___ cubic inches.

A

660

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15
Q

HYD 3 fluid is cooled by the _____.

A

MWGB oil cooler and fan assembly

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16
Q

T/F: the HYD 3 thermal control valves operate the same as the TCVs for HYD 1/2.

A

True

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17
Q

The utility isolation valve is normally _____ and is automatically energized _____ in flight when the landing gear is up and locked.

A

Open

Closed

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18
Q

The only time the UTIL key would show a mismatched stated is if the utility valve is _____.

A

Jammed

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19
Q

The UTIL OPEN/CLOSE key is unavailable when:

A
  • HYD 3 has failed
  • HYD 3 is manually selected off
  • HYD 3 is backing up a swashplate actuator and the reservoir is less than 150 in^3
  • WOW
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20
Q

Flaperon settings are ___ - ___°

A

0-73

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21
Q

In APLN, the flaperons are limited to ___° up and ___° down

A

25

40

22
Q

The maximum flap position displayed on the SFD is ___°.

A

72

23
Q

The maximum elevator deflection is ___ up and ___ down.

A

30°

20°

24
Q

Maximum rudder deflection is ___ either side of neutral.

A

20°

25
Q

HPDU 1/2 drive the _____ ball screw while HPDU 3 drives the _____ ball screw.

A

Outer

Inner

26
Q

What does the Nacelle B/U Enable switch do?

A

Causes HPDU 3 to power each ball screw on each actuator.

27
Q

Why wouldn’t you be able to rotate the nacelles past 45°?

A
  • WOW

- cabin door is open

28
Q

When will EAPS switch from AUTO to OFF?

A

When the NAC B/U is enabled.

29
Q

The rotor brake is designed to stop the proprotors from ___ in 12 seconds.

A

40%

30
Q

In the event of an emergency, the rotor brake will stop the rotors from ___ in 20 seconds.

A

100%

31
Q

Draw and label the HYD stat layer.

A

Done

32
Q

Explain the leak logic for a HYD 2 leak in a flaperon actuator.

A
  1. Leak is detected
  2. HYD 2 local isolation valve isolates HYD 2 to the right nacelle
  3. HYD 2 remote switching valve in the left nacelle allows HYD 3 to power the other half of the swashplate actuators.
33
Q

Explain the leak logic of a HYD 1 leak in the left nacelle swashplate actuator.

A
  1. HYD 1 local isolation valve isolates it to the left nacelle
  2. HYD 1 remote switching valve open up for HYD 3 to power the other swashplate actuator.
  3. HYD 1 local switching valve switches back to to HYD 1 to prevent HYD 3 from leaking out.
  4. HYD 1 bleeds out until HYD 1 FAIL and SWPL SINGLE BOOST
34
Q

Explain the leak logic of a HYD 2 leak in the left nacelle swashplate actuator.

A
  1. HYD 2 isolated
  2. HYD 2 remote switch
  3. HYD 3 leaks and HYD 2 remote switchback
  4. Left NAC SWPL SINGLE BOOST
35
Q

HYD 3 provides _____ psi to the brake master cylinders.

A

2000

36
Q

What does the back-up brake system do?

A

Provides MLG brake pressure when the HYD 3 pump isn’t operating or off.

37
Q

Ramp and door opening and closing times are approximately ___ seconds.

A

12

38
Q

What does a green X mean?

A

When the AC is on the ground and the system is turned off.

39
Q

What does a green dot mean?

A

The actuator boost state, HYD temp, or HYD fluid quantity is unknown or invalid.

40
Q

What does a white crosshatch patten signify?

A

A single failure in a triple redundant system.

41
Q

When will the elevator have a yellow fill?

A

For a critical or dual actuator failure.

42
Q

When will HPDU 3 turn yellow?

A

For an FCC failure.

43
Q

When will the swashplate actuators have a white crosshatch pattern?

A

With an FCC failure.

44
Q

What does red generally indicate?

A

The complete failure of a system or component.

45
Q

When is a red X displayed in place of a swashplate actuator system?

A

That half of the swashplate actuator is not being powered.

46
Q

When is a red X displayed behind a hydraulic pump?

A

During a cross channel data link failure between FCCs.

47
Q

When will a red X be displayed behind the pressure data?

Will there still be a pressure reading available?

A

With a failed aircraft interface unit and the data becomes invalid.
Yes but the data should be considered invalid.

48
Q

Flight is prohibited with HYD fluid temp below ___.

A

18°C

49
Q

Minimum HYD 3 temperature for engine start is ___.

A

4°C

50
Q

Maximum HYD temperature is ___.

A

121°C

51
Q

Normal operating temperature is ___.

A

65°C

52
Q

Normal operating fluid quantity is ___.

A

200 cubic inches

MV-22 Osprey (7 decks)

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