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Q6. With reference to a hydraulic steering gear, explain EACH of the following:

(a) The factors that may contribute to the failure of a hydraulic pipe coupling; (2)

(b) why it is of the utmost importance that in the event of a hydraulic system failure that the rudder is locked and isolation of the affected area is achieved as soon as possible; (2) (c) the problems that may occur when locking the rudder in heavy weather; (2)

(d) Why hydraulic locking is preferable to mechanical means; (2)

(e) What is meant by the single failure concept. (2)