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T-6B Texan II/Primary > Hydraulic and related systems > Flashcards

Hydraulic and related systems Flashcards

1
Q

Describe the basic hydraulic system of a T-6B.

A

Consists of one engine-driven pump, an emergency accumulator, 5 quart capacity reservoir.

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2
Q

What is system pressure regulated at?

A
  • Normal system pressure is 3000 +/-120 psi.
  • A relief valve will open between 3250 and 3500 psi
  • 1800 psi minimum is needed to power the landing gear, main gear doors, speed brake, and nose wheel steering
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3
Q

What causes HYD FL LO caution message to illuminate?

A

reservoir level dropped below 1 quart

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4
Q

When should the hydraulic system be serviced?

A

If the fluid level does not indicate FULL AD with the accumulator discharged.

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5
Q

When does EHYD PX LO caution illuminate?

A

When the emergency accumulator pressure drops below 2400+/-150 psi.

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6
Q

What does pulling the emergency gear extension handle do?

A

Activates the emergency hydraulic system by isolating the main hydraulic system at the power pack slide assembly and releasing the emergency accumulator pressure through independent emergency lines to extend the landing gear and flaps.

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7
Q

What prevents the emergency system from bleeding back into the main system?

A

check valve

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8
Q

What prevents a leak in the emergency system from depleting the main system ?

A

A hydraulic fuse that will close when fluid flow exceeds .25 GPM with a maximum loss of 1/2 quart

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9
Q

Will there be sufficient fluid to lower the landing gear and flaps with the main system if the HYD FL LO caution just came on?

A

yes (but probably not for long)

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10
Q

How many actuators does the landing gear system have?

A

Four. One for each gear, and one for both inboard main gear doors.

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11
Q

What landing gear controls are only found in the front cockpit?

A

the emergency extension handle and the downlock override button.

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12
Q

What does the green light for each gear indicate?

A

that gear is down and locked

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13
Q

What does a red landing gear light indicate?

A
  • the nose gear is in transit
  • the main gear doors are not closed.
  • the PCL is approaching idle with the gear handle up
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14
Q

Should you use the downlock override botton to raise the landing gear if the gear handle is difficult to raise to the UP position?

A

No

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15
Q

Are you able to raise the landing gear if the right WOW switch has failed?

A

No, use of the downlock override button will allow the gear handle to be raised, but will not retract the landing gear.

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16
Q

What locks the main landing gear down?

A

Internal locks in the main gear actuators engage to lock the main gear down.

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17
Q

How long does a normal gear extension/retraction take?

A

Approximately six seconds

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18
Q

How is the nose gear locked down?

A

A spring strut braces the nose gear folding strut in the over-center position to lock the nose gear down.

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19
Q

How is the nose gear locked up?

A

An internal actuator lock locks the nose gear in the up position.

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20
Q

Do you need electrical power to use the emergency landing gear system?

A

No.

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21
Q

Does the gear handle need to be down to extend the landing gear with the emergency system?

A

No. The landing gear will extend regardless of gear handle position, although emergency procedures will dictate gear handle down prior to pulling the emergency gear handle.

22
Q

Will the main gear doors close after the landing gear has been extended with the emergency system?

A

No.

23
Q

Can you retract the landing gear after extending it with the emergency system?

A

No.

24
Q

What will activate the aural landing gear position warning?

A
  • Gear handle not DOWN (regardless of gear indications), PCL below a mid-range position, airspeed below 120 KIAS, and flaps UP or TAKEOFF.
  • All gear not indicating down and locked with flaps LDG (regardless of gear door position, power setting, or airspeed)
  • Weight on wheels with gear handle not DOWN.
25
Q

Is it necessary to check actual gear indications if the gear warning horn has automatically silenced itself?

A

Yes. Gear worning horn will automatically silence when the gear handle is lowered with flaps UP or TAKEOFF, regardless of gear position.

26
Q

When will the WARNING SILENCE button not silence the warning horn?

A
  • The aircraft is configured with gear UP and flaps LDG
  • gear handle UP when aircraft is on the ground
27
Q

If the warning silence button was pressed when you were above 120 KIAS it will not sound if you slow below 120 KIAS without resetting it. How do you reset the aural warning?

A

Move the PCL above mid-range position.

28
Q

How should you perform a minimum radius turn?

A

Disengage the nose wheel steering and use power, full rudder, and diferential braking

29
Q

How far to either side of center will the nose wheel turn with NWS off?

A

80 degrees

30
Q

What function does the nose wheel steering actuator have in flight?

A

It centers the nosewheel when the aircraft is in the air and the nose gear is not up and locked.

31
Q

How is the selector valve on the NWS actuator controlled?

A

It is electrically controlled by a switch on each control stick grip to turn on nose wheel steering.

32
Q

How is the servo valve on the NWS actuator operated?

A

By a push-pull cable connected to the rudder pedals to command left or right steering.

33
Q

What two things provide nose wheel shimmy damping?

A

The NWS actuator and a friction collar on the landing gear strut cylinder.

34
Q

How do you know if the NWS system is on?

A

A green NWS advisory appears on EICAS

35
Q

Should NWS be used for high speed taxi?

A

No. NWS is to be used at ramp speeds only.

36
Q

Describe the flap system.

A

Hydraulically operated, electrically controlled, four-segment split flaps.

37
Q

What does the flap system consist of?

A

Two flap selectors, two selector valves for normal operation, an emergency extension selector valve, flap actuator, flap torque tube, two flap position indicators, and associated microswitches.

38
Q

What are the three flap positions?

A
  • UP
  • TO (takeoff, 23° deflection)
  • LDG (landing, 50° deflection)
39
Q

What drives the flap indicator in each cockpit?

A

A cam on the torquetube activiates position sensing microswitches which drive the flap indicators

40
Q

Is flap operation and position indication available when the battery bus has failed?

A

No.

41
Q

Is emergency flap operation available when the auxilliary battery is the only source of electrical power?

A

No.

42
Q

What will happen if you open the FLAP CONT circuit breaker?

A

The flaps will retract to the UP position and flap indication will be unreliable

43
Q

How do you perform emergency flap extension?

A

After the emergency landing gear extension handle is operated, wait until the landing gear is down, and then set either flap selector to TO or LDG.

44
Q

What does the flap indicator show when the flaps are moving from one position to another?

A

It will move to an intermediate position between the placarded settings to indicate flap motion.

45
Q

What happens when power is removed from the flap indicator?

A

The position pointer moves to a position counterclockwise of the UP position.

46
Q

What indication do you have that the speedbrake is extended?

A

The EICAS advisory SPDBRK OUT

47
Q

What keeps the speedbrake retracted when the engine is off?

A

An internal hydraulic uplock

48
Q

What is used to counteract the pitch change tendency when the speedbrake is extended?

A

A system of cables, pulleys, and push-pull cables connected from the speed brake to the elevator trim tab automatically input pitch trim

49
Q

How do you extend and retract the speedbrake?

A

Moving the speedbrake switch on the top inside surface of the PCL rearward extends the speedbrake, and forward retracts the speedbrake.

50
Q

How far does the speedbrake extend?

A

70 degrees from the stowed position

51
Q

What causes the speedbrake to retract?

A
  • switch moved forward
  • flaps are extended
  • PCL moved to MAX

T-6B Texan II/Primary (20 decks)

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