Sequence System
INDICATE RETRGRADE ATTITUDE Switch-Indicator
Illuminated amber when the electronics timer energizes the TR-256 second relay. The amber light cues the crew to press the switch-indicator at this time. When pressured, a bias voltage is placed on the pitch needle of the FDI, and the inertial platform is electrically placed in the REF mode. When released the ember light is extinguished and a green.