Q8. a) State the reasons for persistent slackening of holding down bolts of a main engine. (6)
b) i) State the advantages of using non-metallic choking for main engines. (5)
ii) State precautions to be observed when fitting non-metallic chocks in order to ensure accurate chocking. (5)
Q7. a) Describe, with the aid of a sketch, a main engine holding down system explaining how the design features help prevent excessive stress in the holding down studs (8)
b) Describe, with the aid of a sketch, an engine top bracing arrangement, explaining why they are fitted and checked for operational performance (8)
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