“T2 + T3 TELESCOPES ASSEMBLY” REFIT
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The “T3 Telescope refi t” operation should be done. Use sling + hoist ( Item1 ) to insert “ T2 + T3 telescopes ” assembly ( Item 2 ) into T1 telescope ( Item3 ). During this operation, check that the “ T3 retract chain ” goes in smoothly and is always intension. Put “ T2 extend chains ” in T2 centre to ensure that they do not slide on the sides.
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Position temporary chocks ( Item 4 ) between T1 telescope ( Item 3 ) and T2 telescope ( Item 5 ). This operation protects the right boom and prevents crushing of the “ T3 retraction chain ” ( Item6 ) when shifting sling ( Item1 ) to boom head. 1
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- Reposition sling ( Item 1 ) to boom head then insert “ T2 + T3 telescopes ” assembly into T1 telescope ( Item 3 ). Comment: - Do not insert T2 + T3 assembly fully into T1. Leave about 30 cm clearance. - Lift the T2 + T3 assembly and take out temporary chocks (Item 4). 34
