7.12 Steering - 7.12 Steering

Question 1

Systems Steering consists of

Answer 1

Electrical control system
Hydraulic system
Follow up system to provide feedback
Indication of Rudder angle

Question 2

Mechanical Steering System Components

Answer 2

RAM
Crosshead Guide Rod
Linkage to rudder
Cylinder
Tie Rod
Crosshead
Ratchet Wrench
Stops
Cylinder

Question 3

Hydraulic Power Unit (HPU)

Answer 3

Provides hydraulic power needed to move the rudder via the RAM

Electric Motor
Main Pump
Aux Pump

Question 4

Electrical Steering System Components

Answer 4

Two Control stations - Bridge, Aft Steering
Local Control Units (LCUs) - One per HPU
Rudder Angle Transmitter Units (RATUs)

Question 5

Electrical Pumps (Fill & Drain)

Answer 5

Intended for emergency steering operations to control hydraulic steering system directly

Question 6

Hand Pumps

Answer 6

Physically control the flow of hydraulic fluid to the desired cylinder

Question 7

Ratchet Wrenches

Answer 7

Can be used directly on the threaded cylinder ties

Question 8

Steering Modes for a DDG

Answer 8

Computer Assisted Automatic/VMS External (Not really used)
Computer Assisted Manual (Normal mode)
Backup Manual (Emergency)

Question 9

Steering Checks

Answer 9

Conducted within 24 hrs prior to any evolution requiring setting of Restricted Maneuvering Doctrine (RMD) – i.e. Sea and Anchor, UNREP

Test operability of steering systems from all controlling station and control/correct variation and error between rudder order and rudder angle

Max variation between Helm and Local Rudder Indicator is 2 degrees

Ship-Specific Steering Check Procedures: MIP 5600, R-7

Question 10

Steering Safety

Answer 10

Steering stops - Max rudder = 35 degrees

Copper and Steel danger zones
Copper = 37 degrees
Steel = 38 degrees

Question 11

Helm Safety Officer

Answer 11

Bridge watchstander during special maneuvers
Monitors Helmsman and Lee Helmsman
Ensures all orders from the Conning Officer are carried out smartly and correctly
Monitors EOCC actions conducted by the Helmsman and Lee Helmsman for proper procedure

Question 12

Indicators and Alarms

Answer 12

Helm and Rudder Indicator
Steering Emergency Signal Alarm
Steering Power Failure Alarm
Low Oil Level Alarm
High Oil Temp Alarm

Question 13

Casualty Procedures for Steering

Answer 13

Shift Cable (Signals) / Mode of steering control
Shift to other mechanical units
Pass the word
Shift control to Aft Steering unit (1)
Take Control at LCUs (Local Control Units) (2)
- Fill and Drain Pump (3)
- Hand Pump (4)
- Ratchet Stop to hold rudder (5)