Hydraulics

Question 1

What holds the landing gear in the retracted position?

Answer 1

Nitrogen charged accumulator maintains hydraulic pressure

Question 2

How is nosewheel steering accomplished?

Answer 2

Direct linkage and differential braking

Question 3

Describe the hydraulic system?

Answer 3

Electrically driven, hydraulically actuated

Question 4

Hydraulic system components

Answer 4

•Power package
•Service tray assembly
•Accumulator
•Time delay relay
•Nitrogen pressure cylinder

Question 5

How long would the gear be held up after a power package failure?

Answer 5

Up to 200 minutes

Question 6

Where is the hydraulic power package and what does it do?

Answer 6

LH wing root behind the spar
Supplies pressurized fluid to the gear selector and service selector valves and accumulator

Question 7

What is the hydraulic reservoir capacity?

Answer 7

.79 gal

Question 8

What ensures the hydraulic reservoir remains pressurized in flight?

Answer 8

Nitrogen tank

Question 9

What is normal hydraulic system pressure?

Answer 9

Up to 2875 psi

Question 10

How is the system pressurized?

Answer 10

DC motor uses pressure switch to turn the motor on at less than 2450 psi and off between 2725 and 2875 psi

Question 11

What will cause the hydraulic CAWS message to illuminate?

Answer 11

Less than 1800 psi

Question 12

What is the function of the accumulator?

Answer 12

Maintain system pressure
Keep gear up if power package fails

Question 13

What is the function of the nitrogen pressure cylinder?

Answer 13

Prevents pump cavitation

Question 14

The nitrogen pressure cylinder is pressurized to what?

Answer 14

56 psi

Question 15

Tires are inflated to what?

Answer 15

60 psi

Question 16

What prevents gear retraction on the ground?

Answer 16

A de-energized solenoid plunger locks the landing gear handle in the down position

Question 17

What is the minimum hydraulic fluid quantity needed for operation?

Answer 17

.66 gal

Question 18

When might you get the hydraulic CAWS message on the ground after landing?

Answer 18

System cycled 6 times in an hour

Question 19

What are two reasons you might receive a hydraulic CAWS message in flight?

Answer 19

Less than 1800 psi
System on for 10 minutes during flight

Question 20

What keep the nose gear in the down position?

Answer 20

Drag link acts as an overcenter lock

Question 21

What assists in lowering the nose gear during an emergency?

Answer 21

Spring strut…also holds drag link in over center position

Question 22

What holds the main gear down?

Answer 22

Pawl lock mechanism holds the actuator in the fully extended position

Question 23

What do red landing gear lights indicate?

Answer 23

In transit or unsafe condition

Question 24

When would the gear horn sound and the gear lights illuminate?

Answer 24

Flaps >15 no gear down
A/S < 130 and throttle to idle

Question 25

How many strokes are necessary to lock the gear down manually?

Answer 25

60

Question 26

Do the main gear have down locks? Up locks?

Answer 26

Down locks only

Question 27

Maximum nose steering using rudder pedals?

Answer 27

12 degrees either side

Question 28

When can the nose steering extend beyond 12 degrees using rudder pedals?

Answer 28

If using brakes simultaneously

Question 29

Maximum towing nose wheel steering

Answer 29

+/- 60 degrees

Question 30

Left squat switch…

Answer 30

Left stick pusher computer
• Cabin Pressurization Control System
•Central Advisory and Warning System
•Engine Instrument System
•Hydraulic system control

Question 31

Right squat switch…

Answer 31

•Right stick pusher computer
•Landing gear indication
•Altitude and Heading Reference System (AHRS)
•Transponder(s)

Question 32

WOW failure in the air prevents what?

Answer 32

Gear retraction

Question 33

If both pilots are pressing the brakes, which one controls?

Answer 33

The one pressing the hardest