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Q4. With reference to main thrust block arrangements

(a) Explain how the tilting pads assist in the formation of an oil wedge (2)

(b) Describe the actions that may be taken if upon inspection the pads are found to be

(i) Lightly scored (2)

(ii) Wiped (2)

(c) Explain how the thrust clearance may be measured, stating a typical value (2)

(d) State the possible effects if the thrust clearance is incorrect (2)