Originally Posted by
albatross
51 Ng. I have never seen that low an idle used in a helicopter installation. Must be a fixed wing thing…Twin Otter or King Air perhaps.
True. With the newer turbine designs it's mostly a fixed wing application where you see the lower idle settings as noted in the chart above. However, in some older helicopters especially those with direct-drive turbines you'll see engine idle settings in the mid-50% N1 range. For example, the SA315B Lama and S61 had engine idle settings in the 53-56% range.