Purpose

This document defines standardized connectors intended for use on rack-mountable avionics equipment. It incorporates changes to MIL-C-81659 that have taken place since ARINC Specification 404A was published in 1974. These changes have not affected the form, fit, or function of the connectors. In addition, new avionics installations on commercial aircraft are requiring the use of connectors that provide Electromagnetic Interference (EMI) protection. These EMI requirements have been added to this specification.

ARINC Specification 404B contains provisions for the connectors, along with Appendices A and B, that define the connector insert arrangements and the connector keying layouts, respectively. In addition, there is a series of 12 connector drawings defining the dimensional configuration of the four basic shell sizes for plugs, receptacles and plugs with EMI capability. This specification improves definition of the connector portion of ARINC Specification 404A.