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Q5. A. Examine in detail three common but entirely different reasons for loss of steering gear systems. B. State how failure is inhibited in the design, operation and maintenance of steering gear systems C. Describe how a vessel may make port upon irreparable failure of the steering telemotor

Q3. State some built in measures by which the steering gear mechanism can be kept operational, in the event of breakages, pipe failures, motor burn out etc. (16)

Q8. With respect to hydraulic Ram steering gears;

A. What emergency locking device can be used in order to speedily bring the steering gear to rest? State one reason the best angular position to lock the steering gear.

B. Use a simple sketch to show where the “Jumping” (top) and wear down (bottom) rudder carrier ring clearances can be measured. Indicate what clearances you would expect with a new steering gear;

C. State the consequences of the wear down clearances being reduced to less than Zero.

Q1: A. Outline the procedure for the inspection of the rudder in a dry dock.

B. What are the requirement with respect to steeling gear as per SOLAS 74, as amended for the following:

i. Relief valve;

ii. Steering gear control;

iii. Electrical power circuits.

Q4. With reference to steering gear hydraulic systems:

A. Explain the factors that could contribute to failure of connecting flange leading to total loss of oil from the system.

B. Describe an arrangement designed to ensure that the problem would not cause steering failure.

Q8. In a Rotary vane steering gear, briefly state.

a) How are the fixed and moving vanes attached to cylinder and rotor respectively.

b) How many sets of vanes are provided? What is the limitation factor to number of vanes.

c) How is strength imparted to moving vanes to enable them to act as rudder stops?

d) How is rudder uplift accommodated?

Q7. The steering gear operation of a vessel that recently experienced a heavy storm is found to be abnormally sluggish.

a) State the reasons for possible malfunction of the gear.

b) State the corrective actions that may be carried out at sea, that will allow the vessel to continue to the nearest port.

Q6. Steering system failure has caused shipping casualties and oil pollution. Discuss

a) The causes of such failure (8)

b) The precaution necessary in design, operation, and maintenance of these systems. (6)

c) Requirements on tankers, which was made mandatory after the shipping casualty. (6)

Q6: With reference to electro-hydraulic steering gears:

A. Sketch and describe a steering gear with two 50% torque units conforming to the single failure criteria. (8)

B. State, with reasons, the precautions necessary when operating on two rams only; (4)

C. Describe the tests necessary to ascertain that the gear will operate as required when one side of the circuit develops a malfunction. (4)