Anti-Rotation Guide Bushing.
Patent, filed 3 Jul 86, patented 28 Feb 89,
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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A variable guide vane bushing assembly which features means that prevents bushing rotation. A bushing comprises flats 16b on its outer sleeve, the flats interlock with race track shaped holes 20a on a tab-lock washer. The tab lock washer spans two or more adjacent vane stems and thus is not susceptible to rotation. A retainer and the vane arm assemble on top of the tab-lock washer to complete the assembly. Patents. mjm