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PC-12 Study Guide Expanded > Landing Gear > Flashcards

Landing Gear Flashcards

1
Q

What type of landing gear configuration does the PC-12 have?

A

Tricycle

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2
Q

How is the landing gear actuated?

A

Hydraulically

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3
Q

What is VLO?

A

177 knots

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4
Q

What is VLE

A

236 knots

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5
Q

How is nose wheel steering accomplished?

A

Controlled with the rudder pedals.
12 degrees with just rudder.
60 degrees with differential braking.

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6
Q

What type of strut does the nose gear have?

A

A fluid and nitrogen filled strut.

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7
Q

What assists the nose gear in free falling during emergency extension?

A

A spring strut.

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8
Q

What holds the nose gear down?

A

An over-center drag brace.

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9
Q

Does all landing gear completely retract into the plane?

A

The nose gear does, the mains protrude approximately 1”.

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10
Q

What type of main gear is on the PC-12?

A

Trailing-link.

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11
Q

What holds the main gear down?

A

Mechanical down locks.

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12
Q

What type of system is used for landing gear operation?

A

A hydraulic system separate from the system for brakes with a single DC electrically driven motor.

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13
Q

Where is the landing gear hydraulic motor located?

A

Located in the left wing root behind the main spar.

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14
Q

What cools the landing gear hydraulic motor and what happens if it motor overheats?

A

It has a cooling fan.

If the motor overheats electric power will be removed. Once the motor cools it will operate again.

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15
Q

What prevents the hydraulic motor from cavitating during low temperature operations?

A

The fluid reservoir is pressurized.

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16
Q

How do we check landing gear hydraulic reservoir and pressure on the preflight?

A

The sight glass and pressure gauge which are visible inside the cargo door frame at the root of the wing.

17
Q

What is type of redundancy is included in case of a hydraulic power pack failure?

A

A nitrogen charged accumulator which will hold the gear in the up position for 200 minutes.

18
Q

How does the nitrogen accumulator function?

A

A pressure switch is located in the accumulator and controls the operation of the power pack.

19
Q

What are the PSI ranges for triggering the power pack to increase pressure?

A

Activates power pack below 2,450.

Deactivates power pack between 2,725 and 2,875.

20
Q

What would trigger a “CAWS HYDR” message?

A

If system pressure drops below 1800 PSI.

21
Q

How long does a normal landing gear cycle take?

A

12 seconds.

22
Q

How is inadvertent gear retraction on the ground inhibited?

A

Locking the selector handle in the down position with a spring loaded solenoid via WOW.

23
Q

In the event of a power pack failure or the system was auto-shed how do we extend the gear?

A

Pull the HYDR CTL CB and ensure airspeed is below 110 kts.
The gear should free-fall when the handle is placed in the down position.
If the gear does not fall you may have to use the hand pump up to 60 strokes.

24
Q

How is the landing gear extended position relayed to the dual indication lights?

A

Micro switches on the main gear actuators and a proximity switch on the nose gear landing drag link.

25
Q

How is the landing gear retracted position relayed to the dual indication lights?

A

Proximity switches on the gear doors.

26
Q

What triggers the aural gear unsafe warning?

A

When the gear is not locked down and:

1) Below 130 knots and torque below 10 PSI.
2) Flaps beyond 15 (cannot be silenced).

27
Q

In flight what will trigger a “CAWS HYDR”?

A

1) System pressure below 1,800 PSI.

2) Power pack has been in operation for more than 10 minutes.

28
Q

On the ground what will trigger a “CAWS HYDR”?

A

If the power pack is cycled more than 6 times in one hour.

29
Q

What will trigger a “CAWS AIR GND”?

A

A disagree between LH and RH WOW after 10 seconds.

30
Q

What is connected to the LH WOWs?

LCCEH

A

1) LH Stick Pusher.
2) Cabin pressurization and control system.
3) CAWS
4) EIS
5) Hydraulic system control.

31
Q

What is inhibited on the GROUND by the Air/Ground System?

A

1) Gear up selection/Hydraulics
2) Pressurization
3) TAS/EGPWS
4) Transponder enters ground mode.

32
Q

What does the right hand WOWs do?

A

Verifies the left side.

33
Q

When will you get an aural Gear Unsafe warning?

A

Below 130 knots and torque below 10 PSI.

Flaps beyond 15 degrees (cannot be silenced).

34
Q

In flight when does CAWS HYDR illuminate?

A

System pressure below 1,800 PSI.

Power Pack has been in operation for more than 10 minutes.

35
Q

On the ground when would you get a CAWS HYDR?

A

Illuminates when you land if the packs cycled more than 6 times in one hour.

PC-12 Study Guide Expanded (11 decks)

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