Description
The Honeywell 4020577-3 is a self-contained directional gyro and amplifier assembly that provides a gyro-stabilized heading reference for aircraft compass systems. It integrates gyro, amplifier, synchronizer, and DC static inverter functions into a single electrically driven unit for reliable heading output.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Honeywell |
| Category |
Avionics Instruments |
| Part Number |
4020577-3 |
| Subcategory |
Directional Gyros |
| Gyro Type |
Electrically driven directional gyro |
| Heading Output |
Dual heading transmitters, 3-wire (ARINC) |
| Power Requirements |
28 VDC, 125 W starting, 100 W running |
| Output Power |
50 VA total |
| Gimbal Horizontal Axis Freedom |
±85 degrees |
| Gimbal Vertical Axis Freedom |
360 degrees |
| Gyro Free Drift |
±24 degrees/hour |
| Slew Rate |
30 degrees/minute |
| Slaved Accuracy |
±2 degrees |
| Slaving Rate |
2.5–5.0 degrees/minute |
| Compliance |
TSO-C6c / TSO-C6e |
| Dimensions |
7.22 in H x 6.25 in W x 9.03 in L |
| Weight |
6.7 lbs |
Information About 4020577-3
The 4020577-3 is a Honeywell directional gyro designed as a fully self-contained heading reference solution for aircraft compass systems. It houses the gyro, amplifier, and synchronizer within a cylindrical enclosure, with a DC static inverter mounted in the base to supply AC power to internal and external system components. The unit includes two independent heading transmitters that provide 3-wire ARINC heading information to separate systems simultaneously. It is electrically driven and engineered to meet TSO-C6c and TSO-C6e requirements, ensuring compatibility with certified aviation navigation architectures.
Key Features
- Integrated Gyro And Amplifier Assembly: Combines gyro, amplifier, synchronizer, and inverter into a single compact unit for simplified installation.
- Dual Heading Transmitters: Provides redundant 3-wire ARINC heading outputs to support two independent systems.
- DC Static Inverter: Supplies stable AC power for the gyro synchronizer and connected external components.
- Wide Gimbal Freedom: Supports ±85 degrees horizontal and 360 degrees vertical movement for stable operation in dynamic flight conditions.
- Accurate Slaved Operation: Maintains heading accuracy within ±2 degrees with controlled slaving rates.
- Electrically Driven Design: Ensures consistent performance without reliance on vacuum systems.
- Certified Performance: Meets TSO-C6c and TSO-C6e standards for aviation compass system applications.
The 4020577-3 delivers the reliability and precision required for continuous heading reference and navigation support in certified aircraft compass systems.
