Landing Gear

Question 1

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

Answer 1

Tricycle

Question 2

How is the landing gear actuated?

Answer 2

Hydraulically

Question 3

What is VLO?

Answer 3

177 knots

Question 4

What is VLE

Answer 4

236 knots

Question 5

How is nose wheel steering accomplished?

Answer 5

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

Question 6

What type of strut does the nose gear have?

Answer 6

A fluid and nitrogen filled strut.

Question 7

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

Answer 7

A spring strut.

Question 8

What holds the nose gear down?

Answer 8

An over-center drag brace.

Question 9

Does all landing gear completely retract into the plane?

Answer 9

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

Question 10

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

Answer 10

Trailing-link.

Question 11

What holds the main gear down?

Answer 11

Mechanical down locks.

Question 12

What type of system is used for landing gear operation?

Answer 12

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

Question 13

Where is the landing gear hydraulic motor located?

Answer 13

Located in the left wing root behind the main spar.

Question 14

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

Answer 14

It has a cooling fan.

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

Question 15

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

Answer 15

The fluid reservoir is pressurized.

Question 16

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

Answer 16

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

Question 17

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

Answer 17

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

Question 18

How does the nitrogen accumulator function?

Answer 18

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

Question 19

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

Answer 19

Activates power pack below 2,450.

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

Question 20

What would trigger a “CAWS HYDR” message?

Answer 20

If system pressure drops below 1800 PSI.

Question 21

How long does a normal landing gear cycle take?

Answer 21

12 seconds.

Question 22

How is inadvertent gear retraction on the ground inhibited?

Answer 22

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

Question 23

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

Answer 23

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.

Question 24

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

Answer 24

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

Question 25

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

Answer 25

Proximity switches on the gear doors.

Question 26

What triggers the aural gear unsafe warning?

Answer 26

When the gear is not locked down and: 1) Below 130 knots and torque below 10 PSI. 2) Flaps beyond 15 (cannot be silenced).

Question 27

In flight what will trigger a "CAWS HYDR"?

Answer 27

1) System pressure below 1,800 PSI. | 2) Power pack has been in operation for more than 10 minutes.

Question 28

On the ground what will trigger a "CAWS HYDR"?

Answer 28

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

Question 29

What will trigger a "CAWS AIR GND"?

Answer 29

A disagree between LH and RH WOW after 10 seconds.

Question 30

What is connected to the LH WOWs? | LCCEH

Answer 30

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

Question 31

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

Answer 31

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

Question 32

What does the right hand WOWs do?

Answer 32

Verifies the left side.

Question 33

When will you get an aural Gear Unsafe warning?

Answer 33

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

Question 34

In flight when does CAWS HYDR illuminate?

Answer 34

System pressure below 1,800 PSI. | Power Pack has been in operation for more than 10 minutes.

Question 35

On the ground when would you get a CAWS HYDR?

Answer 35

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