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 Instruments - Directional Gyros - Sigma-Tek

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*NOTE: Lighted instruments do not include lamp trays, please see accessories to purchase separately.

The 4000C/D is an air-driven directional gyro with A.C. autopilot pickoffs. Left turns produce clockwise dial rotation and right turns produce counter-clockwise rotation. 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. To change course, the right selector knob is pressed and turned to disengage the dial shaft and set the pointer to a new heading. Releasing the selector knob re-engages the pointer with the dial shaft. As the aircraft turns onto a new course, the pointer returns to its original position. The on-course position of the pointer is always at the top of the azimuth circle (0° on the dial with the aircraft headed north).

Some Auto-Pilot gyros are FAA PMA approved for use in several models of the Century and S-Tec Auto-Pilot systems.
  • Height: 3.25"
  • Width: 3.38"
  • Depth: 6.68" (max)
  • Weight: 2.5 lbs. (max)
  • Markings: Matte white
  • Finish: Dull black

  • Environmental Characteristics
  • Temperature: -30° to 50° C
  • Vibration:
    CPS: 5 to 50
    Maximum Double Amplitude: 0.020 in.
    Maximum Acceleration: 1.5 G's
  • Humidity: 0% to 95% at 32° C
  • Altitude: 0 to 40,000 ft.

    Model 4000C Pin Out:
  • Connector: S24008-002
  • Pin A: D.G. Signal
  • Pin B: Signal Common
  • Pin D: D.G. Excitation
  • Pin E: D.G. Excitation
  • Pin H: Ground

    Model 4000D Pin Out:
  • Connector: S24008-002
  • Pin D: Input
  • Pin B: Input Common
  • Pin A: Autopilot Heading Output
  • Pin E: Output Common
  • Pin H: No Connection
Sigma-Tek Model Autopilot Model Airplane Index Dial @ 30 Deg. Letters @ 90 Deg. Lighted
(Lamp Tray
PMA Part Number Price Buy
1U262-005-204000D-1ARC 40760-0114 (G502A)YellowWhiteYesNoNo10-05141$2678.00
1U262-006-454000D-6S-TEC (6404)WhiteWhiteYesYes*Yes10-00587$2532.00
Accessories Part No. Price Buy
SIGMATEK 14V LAMP TRAY10-02757$76.75
SIGMATEK 28V LAMP TRAY10-02758$76.75