PC12 Landing Gear System

Question 1

What powers gear extension and retraction?

Answer 1

Hydraulic extension and retraction powered by an electric hydraulic pump.

Question 2

What gas is in the landing gear system accumulator?

Answer 2

Nitrogen

Question 3

What is the purpose of the landing gear system accumulator?

Answer 3

Hold the gear up in case of hydraulic failure

Question 4

How is the gear lowered manually (without hydraulics)?

Answer 4

A combination of free falling and hand pumping inside the cockpit.

Question 5

What are all the parts of the gear position and warning indication system?

Answer 5

3 indicator lights (red/green), an aural warning, and a silencer button

Question 6

How is nose wheel steering accomplished?

Answer 6

Mechanical linkage and differential braking

Question 7

What is the purpose of the spring attached to the nose wheel?

Answer 7

To assist in manual extension

Question 8

What provides the cushioning in all of the gear struts?

Answer 8

Fluid and nitrogen

Question 9

Where are the main gear down and locked indicator switches located?

Answer 9

In the actuators

Question 10

Under normal conditions how is the gear held in the retracted position?

Answer 10

Hydraulic pressure

Question 11

Does the landing gear system have any mechanical uplocks?

Answer 11

NO!

Question 12

How do the gear indicator lights work.

Answer 12

Green means that the gear is down and locked. Red means that the gear is not fully retracted.

Question 13

Where are the electric hydraulic pump and nitrogen charged accumulator located?

Answer 13

Left wing root

Question 14

Approximately how long with the nitrogen accumulator hold the gear in the retracted position?

Answer 14

200 minutes

Question 15

Where is the hydraulic fluid sign gauge located and what is its purpose?

Answer 15

Left side of the cargo door. Its purpose it to check hydraulic fluid levels during preflight.

Question 16

How is the gear prevented from being raised on the ground.

Answer 16

Weight on wheel proximity sensors activate a spring loaded solenoid that prevents movement of the handle.

Question 17

What does the hydraulics caution CAS mean in the air? (HYDR)

Answer 17

That the hydraulic pressure is below 1800psi or the pump has been operating for more than 10 minutes

Question 18

How are the main gear and nose gear held in the extended position?

Answer 18

The nose gear is held by an over center link and the main gear is held down by internal locks in the actuators

Question 19

What bus powers the hydraulic gear pump?

Answer 19

The NON-ESSENTIAL bus

Question 20

What else can isolate the hydraulic pump from the electrical system?

Answer 20

Thermal protection in the electrical power pack itself will isolate the pump, will automatically reconnect once cooled

Question 21

How do you lower the gear in the case of GEN1 failure?

Answer 21

You must select NON-ESSENTIAL override

Question 22

How do you lower the gear in case of an engine failure?

Answer 22

You must select NON-ESSENTIAL bus override in order to lower it under battery power or you may lower the gear with the manual pump

Question 23

What does the HYDR CAS mean when on the ground?

Answer 23

Pump has started more than 6 times during flight

Question 24

What are 4 ways to tell if the gear is not down and locked?

Answer 24

1) no green light

2) horn when PCL is at idle and less than 130KIAS

3) horn when more than flaps 15 and less than 130KIAS

4) landing and taxi lights off

Question 25

When do you get the aural gear warning tone?

Answer 25

Gear up, airspeed less than 130, power below 10psi

Question 26

What can happen if the right main proximity switch fails in flight or on the ground?

Answer 26

If the switch fails in the air you will be able to retract the gear while on the ground, if on the ground you will not be able to raise the gear handle

Question 27

What indications do you get if the left and right weight on wheels switches disagree?

Answer 27

You get an AIR/GRND CAS and “warning, air ground” callout.

Question 28

What is the danger of the AIR/GRND warning on the ground?

Answer 28

1) Gear may be able to be retracted

2) Stick shaker may stay on

3) Cabin may not depressurize

4) Transponder may stay in AIR mode

Question 29

What kind of switches are the weight on wheels switches on the main landing gear?

Answer 29

Proximity switches (not squat switches)