Abstract: Accurate alignment of mating electrical connectors on avionic racking equipment is provided by a first circular alignment projection and a second alignment projection toleranced along at least one line for mating with alignment apertures in the electrical connector.

Abstract: An electrical connector structure is disclosed having combined in each of its male and female mating shells both interengaging electric terminals which make co-axial, or pin-and-socket, contact by telescoping movement and interengaging low insertion force electric terminals which make side contact by relative transverse movement. The connector shells are designed to be supported on a readily removable modular unit and on a backplate of a supporting shelf on which the modular unit is mounted, the shells being located near the interface of the modular unit and shelf. Movement of the unit on the shelf toward the backplate causes guiding interengagement of the male and female shells.

Abstract: A mounting member for an extractor hold down apparatus permits the extractor to exert both extraction and insertion forces at different angles to, for example, an electronic unit on an avionic rack. The mounting member is provided with a pair of elongated slots that accommodate a cross bar and retaining disks mounted on the power shaft of the extractor. The slots provide an angle range of at least 18.degree. plus or minus 15.degree..