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T-6 Systems > Hydraulic System > Flashcards

Hydraulic System Flashcards

1
Q

What is the T-6 hydraulic system pressurized to?

A

3000 +- 120 psi

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2
Q

What devices does the primary hydraulic system operate in normal flight operations?

A
  • Landing gear and main landing gear inboard doors
  • Flaps
  • Speed brake
  • Nose wheel steering
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3
Q

Where are most of the hydraulic system components located?

A

Hydraulic service bay on the lower right side just behind the wing

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4
Q

At what pressure will the hydraulic system allow operation?

A

> 1800 psi

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5
Q

What is the purpose of the engine-driven pump?

A

Creates and distributes pressure to the hydraulic system

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6
Q

What is the purpose of the reservoir?

A

Provides pressurized fluid back to the pump to the keep the pump “charged” with fluid

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7
Q

What is the purpose of the reservoir piston?

A

Steps down the return side of the reservoir to 50 psi to prevent damage to the pump

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8
Q

What is the purpose of the reservoir cylinder?

A

Prevents foaming of the fluid due to low pressure, maintains 50 psi in the reservoir

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9
Q

What is the purpose of the Pressure Release Valve?

A

Helps avoid any damage caused by hydraulic overpressure

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10
Q

What psi does the pressure release valve operate at?

A

3250 to 3500 psi

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11
Q

What is the purpose of the slide valve?

A

Isolate the hydraulic pressure coming from the engine-driven pump, through the power package, from the rest of the hydraulic system when the emergency system is activated

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12
Q

What will activate the emergency hydraulic system?

A

Pulling the landing gear emergency extension handle

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13
Q

Can you return to normal operation once the landing gear emergency extension handle is pulled?

A

No, maintenance must reset the handle and emergency selector manifold

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14
Q

What is the purpose of the selector manifold?

A

Operates the appropriate electrical selector valve

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15
Q

What are normal operating limits for hydraulic pressure?

A

2880 to 3120 psi

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16
Q

What happens if the hydraulic fluid level in the reservoir drops below one quart?

A
  • The amber HYDR FL LO annunciator illuminates
  • MASTER CAUTION illuminates
  • Aural tone
17
Q

When will the emergency system be used?

A
  • In the event of a primary hydraulic system failure
  • In the event of engine failure
  • In the event of battery bus failure
18
Q

What does the emergency system allow?

A

A one-time lowering of the landing gear and main gear inboard doors, and the flaps

19
Q

When is the emergency package pressurized?

A

At engine startup

20
Q

What happens if the emergency accumulator drops below 2400 +- 150 psi?

A
  • Amber EHYD PX LO annunciator illuminates
  • MASTER CAUT
  • Aural tone
21
Q

How is power provided for the landing gear?

A

LDG GR CONT circuit breaker on the batter bus in the front cockpit

22
Q

Approximately how long does it take for normal gear extension/retraction?

A

6 seconds

23
Q

What airspeed must you be below to operate the landing gear and/or flaps?

A

150 KIAS

24
Q

What kind of flaps does the T-6 use?

A

Split flaps, inboard and outboard

25
Q

What are flaps used for?

A

Produce an increase or decrease in lift and drag

26
Q

Which flap setting will give you the greatest amount of lift with the least amount of drag?

A

Takeoff

27
Q

What provides power to the flap system?

A

FLAP CONT circuit breaker on the battery bus in the front cockpit

28
Q

What has to happen before emergency flaps can be used?

A

The emergency landing gear handle must have been activated

29
Q

What powers emergency flap operation?

A

Hot battery bus

30
Q

What is the purpose of the speed brake?

A
  • Decelerate

- Increase descent rate without increasing airspeed

31
Q

What provides power to the speed brake?

A

SPEED BRAKE circuit breaker on the generator bus

32
Q

When will the speed brake not extend?

A

If the flaps are already extended

33
Q

Once extended, the speed brake will remain so until what happens?

A
  • Speed brake switch is moved forward
  • Flaps are extended to TO or LDG position
  • PCL moved to MAX
34
Q

What provides power to the nose wheel steering system?

A

NWS circuit breaker on the generator bus in the front cockpit

35
Q

How far will the nose wheel move with NWS off?

A

80° in either direction

36
Q

How far will the nose wheel move with NWS on?

A

12° in either direction

T-6 Systems (12 decks)

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