Sigma-Tek Directional Gyro | 4000B-30

Sigma-Tek SIA-1U262-001-39 (4000B-30) Directional Gyro

Model 4000B-30, part number 1U262-001-39, features orange airplane color, orange index markers, and white dial. The Sigma-Tek SIA-1U262-001-39 Directional Gyro is FAA and EASA certified.

The 4000B is our standard air-driven directional gyro. As the aircraft turns left or right, gears on the sensing unit and dial shaft translate this rotation into rotation of the instrument’s vertical dial. Left turns produce clockwise dial rotation and right turns produce counter-clockwise rotation. The gyro is controlled by a heading selector knob located on the lower left of the instrument. Pressing and turning the knob first disengages the dial shaft and then resets the dial to a new heading, which results in a new course indication. Releasing the selector knob re-engages the dial shaft. 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).

Sigma-Tek 4000B-30 Directional Gyro Features

• Air-driven precision gyro mechanism
• 360-degree compass heading display
• Resettable via caging knob for realignment with the magnetic compass
• Suitable for climbs, banks, and dives up to 55 degrees
• Compact and durable, fitting standard instrument panel cutouts
• FAA & EASA Certified
• Factory New
• No core return required