Aft Steering

Question 1

What is the max Rudder travel rate?

Answer 1

5.5 degrees per second

Question 2

What is the normal Rudder travel?

Answer 2

35 degrees

Question 3

At what Rudder angle is the Copper Stop used?

Answer 3

37 Degrees

Question 4

At what Rudder Angle is the Steel Stop used?

Answer 4

38 Degrees

Question 5

Where are the Copper and Steel Collars mounted?

Answer 5

At each end of the Tie Rod

Question 6

What happens if the Ram over travels to 37 degrees Rudder Angle?

Answer 6

The Ram Stop Block will hit the Copper Stop

Question 7

What happens when the Copper Stop is crushed?

Answer 7

The Steel Stop will engage the Ram Stop Block

Question 8

What are the two subsystems of the Steering Gear Machinery?

Answer 8

The Steering Gear Hydraulic Oil System and the Fill and Drain Pump Unit

Question 9

What does the Steering Gear Machinery System do?

Answer 9

Provides mechanical advantage through the use of hydraulics to position the rudder

Question 10

How many Hydraulic Power Units(HPU) are there?

Answer 10

2 per Rudder

Question 11

What do the Hydraulic Power Units (HPU) do?

Answer 11

They provide hydraulic pressure to move their associated Rudders

Question 12

How are the Hydraulic Power Units(HPU) numbered?

Answer 12

1A, 1B for Starboard and 2A, 2B for Port

Question 13

What does the Main Pump do?

Answer 13

Supplies the high pressure oil to move the Ram Assembly

Question 14

What kind of pump is the Main Pump?

Answer 14

Variable displacement axial piston pump

Question 15

What is the discharge pressure for the Main Pump?

Answer 15

250-300 psig at zero Main Pump stroke and 2000-2400 psig when on stroke

Question 16

What does the Auxiliary Servo and Replenishment pump do?

Answer 16

Supplies control oil to the main pump Control Servo Assembly and the HPU Transfer Valve

Question 17

What kind of pump is the Auxiliary Servo and Replenishment pump?

Answer 17

Sliding vane type positive displacement pump

Question 18

The Auxiliary Servo Replenishment pump is driven by what shaft?

Answer 18

Same shaft as the Main Pump

Question 19

What is the normal discharge pressure for the Auxiliary Servo Replenishment Pump?

Answer 19

650-700 psig

Question 20

What does the Auxiliary Pump provide?

Answer 20

1. Controls the stroke of the HP pump
2. Controls the position of the HPU Transfer Valve.
3. Provides make-up oil to the HP oil system.
4. Cools the Main Pump Casing.

Question 21

What is the purpose of the HPU supply tank?

Answer 21

Provides a continuous hydraulic fluid source to the auxiliary pump inlet

Question 22

The HPU supply tank receives temperature regulated, filtered fluid from what?

Answer 22

The main pump housing

Question 23

Oil temperature is monitored for the following conditions:

Answer 23

1. Oil temp fails to reach 100°F after running for an hour

2. Oil temp rises above 140°F at any time.

Question 24

If oil temperature fails to reach 100°F after running continuously for one hour what kind of fault is it?

Answer 24

Minor Fault

Question 25

If oil temp rises above 140°F at any time what kind of fault is it?

Answer 25

Major Fault

Question 26

How many Hydraulic Fluid Filters per HPU Filter oil entering the HPU?

Answer 26

2

Question 27

Filter DP High is what psid?

Answer 27

35

Question 28

Hydraulic Fluid Filters bypasses at what psid?

Answer 28

50

Question 29

Hydraulic Fluid Filters high DP causes what kind of fault?

Answer 29

Minor Fault

Question 30

What is the purpose of the Servo Pressure Switch?

Answer 30

Provides a HPU RUN signal when servo pressure exceeds 200 +/- 20 psig and a Servo oil low pressure at 200 +/- 20 psig

Question 31

What kind of fault does the Servo Pressure switch give?

Answer 31

Major Fault

Question 32

What is the Hydraulic Fluid Cooler?

Answer 32

A single-pass tube cooler which utilizes firemain as a cooling medium.

Question 33

What does the Temperature Regulating Valve do?

Answer 33

Senses Cooler inlet temp and bypasses the hydraulic oil around the Cooler when temp is below 120°F

Question 34

The Valve Block contains what?

Answer 34

1. Servo Relief Valve 2. Replenishment Relief Valve 3. Two Replacement Check Valves 4. Two Main System Relief Valves

Question 35

The Servo Relief Valve is set at what psig?

Answer 35

700

Question 36

The Replenishment Relief Valve is set at what psig?

Answer 36

200

Question 37

The Two Main System Relief valves are set at what psig?

Answer 37

2640

Question 38

What kind of Accumulator is used on the HPU?

Answer 38

A nitrogen-charged bladder-type Accumulator

Question 39

What is the purpose of the Accumulator?

Answer 39

Provides replenishment fluid during transient conditions ( large rudder movements ).

Question 40

What is the capacity of the Accumulator?

Answer 40

2.5 gallons

Question 41

What is normal capacity for the Accumulator

Answer 41

1.25 gallons

Question 42

What psig is the Accumulator charged to?

Answer 42

100

Question 43

What kind of valve is the Servo Valve?

Answer 43

Electronically operated solenoid valve

Question 44

Where is the Servo Valve located?

Answer 44

On top of the Valve Block

Question 45

What does the Servo Valve do?

Answer 45

Receives an electrical signal from the LCU and sends servo oil to the Pump Control Servo Assembly

Question 46

What does the Transfer Valve do?

Answer 46

Shifts control or the Rudder between the two HPU's

Question 47

What is the purpose of the Head Tank Assembly?

Answer 47

Provides a positive head pressure to the Auxiliary Pump

Question 48

What is the FADPU?

Answer 48

Fill and Drain Pump Unit

Question 49

What is the Fill and Drain Pump Unit?

Answer 49

It is the fill, flushing, and transfer station for the Steering Gear Machinery and the Emergency Manual Steering Operating Station

Question 50

What are the major components of the FADPU?

Answer 50

1. FADPU Electric Motor Driven Pump 2. Suction Strainer (238 micron) 3. Discharge Filter (6 micron) 4. Discharge Selector Valve 5. Port and STBD Steering Control Valves

Question 51

What is the Discharge Selector Valve on the FADPU?

Answer 51

A manual, three position valve used to select one of the two Ram Units

Question 52

How many Ram Units can the FADPU operate?

Answer 52

Only one Ram Unit and attached Rudder can be operated at one time

Question 53

What kind of fault does the Servo Pressure switch give?

Answer 53

Major Fault

Question 54

What is the Hydraulic Fluid Cooler?

Answer 54

A single-pass tube cooler which utilizes firemain as a cooling medium.

Question 55

What does the Temperature Regulating Valve do?

Answer 55

Senses Cooler inlet temp and bypasses the hydraulic oil around the Cooler when temp is below 120°F

Question 56

The Valve Block contains what?

Answer 56

1. Servo Relief Valve 2. Replenishment Relief Valve 3. Two Replacement Check Valves 4. Two Main System Relief Valves

Question 57

The Servo Relief Valve is set at what psig?

Answer 57

700

Question 58

The Replenishment Relief Valve is set at what psig?

Answer 58

200

Question 59

The Two Main System Relief valves are set at what psig?

Answer 59

2640

Question 60

What kind of Accumulator is used on the HPU?

Answer 60

A nitrogen-charged bladder-type Accumulator

Question 61

What is the purpose of the Accumulator?

Answer 61

Provides replenishment fluid during transient conditions ( large rudder movements ).

Question 62

What is the capacity of the Accumulator?

Answer 62

2.5 gallons

Question 63

What is normal capacity for the Accumulator

Answer 63

1.25 gallons

Question 64

What psig is the Accumulator charged to?

Answer 64

100

Question 65

What are Port and STBD Steering Control Valves?

Answer 65

Manual, three position valves used to direct oil flow to either side of the selected Ram Unit

Question 66

What is the only common connection point for the Steering Gear Machinery?

Answer 66

Storage Tank Assembly

Question 67

What does the Storage Tank Assembly do?

Answer 67

Receives oil from the FADPU Steering Control, Fill Relief, or Emergency Steering Relief Valves