needles split

needles split

needles split
A term used to describe the autorotative condition of the helicopter. The needles indicating engine and rotor RPMs on the RPM gauge are split and not joined. Split needles indicate a divergence between the helicopter engine and rotor speed indications. See also married needles and needles joined.
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Sure enough, the Seneca then drunkenly lunged off course, the engine power needles split, I mashed a foot to the floor and began to secure the "failed" engine.