A homogenous spherical body, a series of which provides the rolling elements in a bearing, ball (as modified). The item is designed primarily to alleviate friction. It may have other usages such as the checking component in a ball-type check valve. Excludes:ball,check; ball,valve,ported.
the item is part of the control installation-feel and centering elevation (digital flight control system) special features, boeing 737 aew&c(airborne early warning and control), aircraft end item identification