Hydraulic System SY109

Question 1

What is the hydraulic system pressurized to?

Answer 1

3000 psi +/- 120 psi

Question 2

What does the primary hydraulic system power (under normal circumstances)?

Answer 2

Landing gear/main gear inboard doors, flaps, speed brake and nose wheel steering

Question 3

What drives the primary hydraulic system?

Answer 3

The engine-driven pump

Question 4

When the pressure exceeds what level, can the hydraulic system be used to power nose wheel steering, landing gear ect?

Answer 4

Above 1800 psi

Question 5

Where is the engine-driven pump located?

Answer 5

In the engine compartment

Question 6

Where does the pump create and distribute pressure to the reservoir?

Answer 6

In the power package, then onward to the selector manifold and the emergency system

Question 7

What does the reservoir do?

Answer 7

Provide pressurized fluid back to the pump to keep the pump charged with fluid

Question 8

What pressure is the return fluid reduced to before entering the pump, and why?

Answer 8

50 psi in order not to damage the pump

Question 9

At what pressure does the pressure release valve operate?

Answer 9

3250 - 3500 psi

Question 10

What is the purpose of the slide valve?

Answer 10

To isolate the hydraulic pressure coming from the engine-driven pump

Question 11

What manifold allows the hydraulic system, the cockpit controls, and the aircraft devices operated by the hydraulic system to work together?

Answer 11

The selector manifold

Question 12

How many assemblies does the selector manifold consist of?

Answer 12

5 electrical selector valves

Question 13

Which element of the primary hydraulic system is responsible for activating fx the lowering of the flaps?

Answer 13

The electrical selector valve

Question 14

On which instrument is the hydraulic pressure displayed?

Answer 14

The Engine/Systems display

Question 15

What is the color and range of normal operating limits of the hydraulic system?

Answer 15

Green: 2880 - 3120 psi (in increments of 10)

Question 16

What is the color and range of the extended scale within safe operating limits of the hydraulic system?

Answer 16

White: 1800-2880 psi3120-3500 psi

Question 17

What is the color and range of the cautionary level of the hydraulic system, and what is the range of the counter?

Answer 17

Amber:1700-1800 psi3500-3600 psiCounter:0-1790 psi3510-4100 psi

Question 18

When will the HYDR FL LO annunciator panel flash (amber)?

Answer 18

If the hydraulic fluid level in the reservoir drops below one quart

Question 19

When will the emergency hydraulic system be used?

Answer 19

In case of:- primary hydraulic system failure- engine failure- battery bus failure

Question 20

The emergency system provides pressure for a one-time lowering of what components?

Answer 20

Landing gear, main gear inboard doors and flaps

Question 21

Where does the emergency package receive its pressure?

Answer 21

The emergency accumulator

Question 22

When is the emergency package pressurized and how?

Answer 22

At engine start-up, by compressed helium

Question 23

The two emergency extension selector valves can be found where?

Answer 23

In the emergency package manifold

Question 24

When will the pressure release valve release excessive pressure?

Answer 24

At 3500 psi

Question 25

In case of a leak above what rate will the hydraulic fuse kick in?

Answer 25

Above 0.25 Gal/min

Question 26

How many cubic inches will the hydraulic fuse allow to pass before shutting of any further flow?

Answer 26

20 - 30 cubic in

Question 27

When will the EHYD PX LO light illuminate?

Answer 27

Below 2400 +/- 150 psi in the emergency accumulator

Question 28

Where is the LDG GR CONT circuit breaker located?

Answer 28

Battery bus

Question 29

What type of shock absorber is each gear leg?

Answer 29

oleo-pneumatic (strut design using oil or gas / combination)

Question 30

How are the outboard landing gear doors operated?

Answer 30

Mechanically

Question 31

What is the function of the friction collar on the nose gear?

Answer 31

Reduce/eliminate nose wheel shimmy

Question 32

How long does a normal gear extension/retraction take?

Answer 32

approx. 6 sec.

Question 33

Does the nose wheel retract completely into the wheel well?

Answer 33

No

Question 34

What color is the gear handle when the main gear inboard doors are not closed?

Answer 34

Red

Question 35

When will the gear handle turn red?

Answer 35

1. when the main gear inboard doors are not closed2. PCL approaching idle with gear handle UP3. Gear/inboard doors are in transit

Question 36

When will the aural landing gear tone sound?

Answer 36

- Gear handle not DOWN, PCL below approx 87% N1 and flaps UP or T/O- All gear not indicating down and locked with flaps LDG- Weight on wheels with gear handle not DOWN

Question 37

What should you always do before pulling the EMER LDG GR HANDLE?

Answer 37

Set the landing gear handle to DOWN

Question 38

What is the procedure for lowering the gear and flaps using the emergency package?

Answer 38

1. Reduce airspeed to or below 150 KIAS2. LDG GR HANDLE - DOWN3. EMER LDG GR HANDLE - PULL4. Confirm proper gear configuration5. Flaps - As required

Question 39

Does it take longer or shorter time to lower the gear using the emergency system?

Answer 39

Longer (more than the normal 5-6 sec)

Question 40

The HYDR FL LO annunciator means that the resevoir fluid level has dropped below what?

Answer 40

1 Qt (quart)

Question 41

What happens in the power package do?

Answer 41

Inside the power package, pressure created by the pump is distributed to the reservoir.

Question 42

Where is the piston that helps to step-down the pressure in order to protect the pump located?

Answer 42

In the power package reservoir