Carefully unpack the KI 256 and inspect the device for any signs of damage. Verify that all accessories, including the installation manual, are included.
| Symptom | Likely Cause | Solution | |---------|--------------|----------| | No attitude display, but power on | Missing 400Hz AC reference from remote gyro | Check continuity on pins 4 & 6 | | Erratic flight director bars | Shield not grounded at source | Terminate shield at remote gyro case | | Slow gyro spin-up | Low voltage drop across circuit breaker | Measure voltage at pin 1 under load (min 11.5V for 14V system) | | Flag “GYRO” visible after warm-up | Remote gyro failure or disconnected | Verify KG 258 or KG 102 power & wiring | | Roll indicates opposite direction | Synchro stator leads swapped | Swap any two of pins 12/13/14 |
14 VDC or 28 VDC (Internal lighting configuration depends on the specific dash number)
This guide is for informational purposes only. Always refer to the official Honeywell publication (King P/N 006-10568-0000) for certified installations. Installation must be performed by a certified avionics technician. ki 256 installation manual
Have a question about your KI 256 installation? Leave a comment below or contact our avionics helpdesk at support@avionics-tech.com.
: This critical modification replaces the command bar PC board to reduce "loading effects" on pitch and roll outputs. It is required in most installations where the is paired with the KC-192 autopilot computer.
The KI 256 requires internal lighting power and reference voltages for its synchros. Carefully unpack the KI 256 and inspect the
Digital multimeter (DMM) for continuity and voltage testing. Non-magnetic screwdrivers for instrument panel adjustments.
Ensure the instrument panel shock mounts are in good condition. Excessive panel vibration will accelerate bearing wear and cause horizon tilt.
Proper installation is critical to avoid gyro precessions or faulty autopilot commands. 2.1 Pre-Installation Planning Always refer to the official Honeywell publication (King
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Start the aircraft engine or connect an external vacuum source. Verify the vacuum gauge reads between 4.5 and 5.2 in. Hg.