The following design features are provided by this recommended practice: 1. Prevention of installation of gyro in wrong position vector-wise. 2. Prevention of wrong gyro from being installed by use of a coded keying system. 3. Center of gravity mount. 4. Use of plug and socket type connectors rather than soldered terminals. 5. Self test feature. 6. Standard to be flexible enough to allow for expansion of types as the need arises. 7. A policed and controlled recommended practice. 8. Plug-in rate gyro. 9. Elimination of wrong harness connection by use of MS33683-1 standard which has 3 keyway positions. This could by expanding to 5 positions.