Sigma-Tek 3-1/8 Dg 4000B 30

The Sigma-Tek 4000B-30 is a standard air-driven directional gyro in the 3-1/8 in (approximately 79 mm) instrument class. It provides a vertical heading display and is adjusted using the heading selector knob on the lower left of the instrument.

This configuration is identified by manufacturer part number 1U262-001-39 and model 4000B-30. It features orange aircraft and index markers, white dial markings at 30°, and letters at 90°. This version is not lighted and does not incorporate a heading-reference bug.

• Manufacturer: Sigma-Tek
• Model: 4000B-30
• Manufacturer part number: 1U262-001-39
• Type: Air-driven directional gyro
• Approximate maximum dimensions: 83 mm high x 86 mm wide x 170 mm deep
• Maximum weight: approximately 1.1 kg
• FAA approved as conforming to TSO-C5c requirements; EASA approval status is not stated by the manufacturer.

For installation and maintenance reference, consult Sigma-Tek’s 4000B-series product information and the applicable manufacturer drawing package and maintenance documentation.