When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Genuine aviation directional gyro used in a wide range of general aviation aircraft. The 4000C-15 series is a proven mechanical heading reference instrument commonly integrated with autopilot systems and traditional “six-pack” cockpit layouts.

Specifications:• Type: Directional Gyro (DG) / Heading Indicator• Model: 4000C-15• Manufacturer Series: Sigma-Tek / Cessna-compatible• Part Number: S3330-2 / 1U262-042 / 1U262-004 series (variant dependent)• Function: Aircraft heading reference for pilot and autopilot systems• Display: 360° rotating compass card with heading bug• System Compatibility: Autopilot-coupled DG systems (Century, S-Tec, King compatible installations)• Mounting: Standard 3-1/8” instrument panel form factor

Physical / Performance Specs:• Approx. Weight: ~2.5 lbs• Size: 3-1/8” standard instrument housing• Power: Aircraft vacuum or electric-driven system (configuration dependent)• Operating Range: Certified for typical GA flight envelopes (up to ~40,000 ft depending on installation)• Construction: Precision gyroscopic rotor with shock-mounted housing

Features: Reliable mechanical heading reference Autopilot-compatible directional output Caged / uncaged heading control knob Smooth azimuth rotation for stable heading indication Standard panel-mounted aviation instrument

Condition:Used / removed from serviceCosmetic condition as picturedSold as-is — buyer responsible for verifying overhaul status and airworthiness for intended installation.

Ideal For:• Aircraft panel restoration• DG replacement or backup instrument• Autopilot system integration• Experimental / certified aircraft builds (as applicable)• Avionics shops and spare inventory