Ki 256 Installation Manual Official

The KI 256 is a precise, analog-era instrument that demands respect during installation. Skipping steps in the KI 256 installation manual—especially the gyro nulling and synchro phasing—will result in degraded autopilot performance, uncommanded pitch oscillations, or a failed inspection.

Whether you’re a weekend warrior or a career avionics technician, keep a copy of 006-10593-0000 in your hangar library. Your autopilot will thank you.

| Pin | Signal | Wire Color (King harness) | Notes | |------|-----------------------------|----------------------------|---------------------------------------------------| | 1 | +28V DC Erection | Red/White | Powers the vertical erection circuits. | | 2 | Gyro Spin Motor (115V AC) | Brown/Black | 400Hz from inverter or alternator. | | 3 | Gyro Neutral (AC return) | Black | Must be isolated from DC ground. | | 4 | Roll Syncro Stator S1 | Blue | To KI 525A or autopilot computer. | | 5 | Roll Syncro Stator S2 | Yellow | | | 6 | Roll Syncro Stator S3 | Green | | | 7 | Pitch Syncro Stator S1 | Orange | | | 8 | Pitch Syncro Stator S2 | White/Orange | | | 9 | Pitch Syncro Stator S3 | White/Green | | | 10 | DC Ground | White/Black | Also connects to gyro case ground. | | 11 | Flag Output (Normally Open) | Gray | Opens on gyro fail, triggers warning flag. | | 12 | Flag Common | Black/White | | | 13 | +28V DC (Aux) | Red | For lighting (if dimmer not used). | | 14 | Lighting Dimmer Bus | Violet | 0-5V DC typical. | ki 256 installation manual

Critical Warning from the Manual: Do not combine AC ground and DC ground. The KI 256 uses separate returns. Combining them creates ground loops that induce 400Hz noise into the syncro outputs, causing HSI oscillations.

5.1 Power-On Test

5.2 Calibration (Pitch & Roll)

5.3 Slaving Alignment

While this guide covers the core of the ki 256 installation manual, you may need the full document for repair station sign-offs. Here are legitimate sources:

Warning: Avoid random PDFs from Google Drive or forum posts. They often contain missing pages (especially wiring diagrams) or incorrect revisions. Use only the revision matched to your gyro’s serial number. The KI 256 is a precise, analog-era instrument