SKADI
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Chinooks have fixed forward gear, castoring aft left gear and steerable aft right gear; being a Chinook it couldn't be simple could it? Maybe the 107 as well. But they work wonderfully well, both of them.
S76
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Some 76's which regularly do training have been known to wrinkle the skin just aft of the baggage compartment on the underside - engineers get upset because the fix can be complex. So drivers, please check under your tailcones especially after training sorties!