Product Description
Sigma-Tek Vacuum Directional Gyro 4000D-3. A vacuum driven directional gyro 1U262-005-36 by Sigma-Tek. The 4000C (52D54) has an autopilot output for the Century llB and the Century lll systems. The Sigma-Tek Vacuum Directional Gyro 4000D-3 is an air-driven directional gyro with A.C. autopilot pickoffs. Two knobs control the gyro. The left knob is used to cage the unit, and the right knob is used to select the instrument’s heading.