Ki 256 Installation Manual May 2026

| Symptom | Likely Cause | |---------|---------------| | No flag retraction after 3 min | Missing gyro power (check KA 51B, pin 6) | | Erratic pitch during turns | Synchro rotor wiring open/shorted | | Dim internal lighting | Incorrect dimmer voltage or pin 8/9 reversed |

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The KI 256 is a King (Honeywell Bendix/King) KI 256 Flight Director Indicator / Attitude Gyro, often used with KFC 150, KAP 150, KFC 200, or KAP 200 autopilot systems. ki 256 installation manual

The official installation manual is typically:

Many installations marry the KI 256 to a King autopilot. The ki 256 installation manual dedicates Appendix C to this interface.

Troubleshooting tip from the manual: If the autopilot chases pitch or oscillates in altitude hold, check the KI 256’s pitch syncro output voltage. Between pins 7 and 8, you should see 11.8V ±0.2V AC at 400Hz. Low voltage indicates a failing syncro or cold solder joint. | Symptom | Likely Cause | |---------|---------------| |

From the field: A common mistake is skipping the 3-minute warm-up. Doing so leads to false nulls and autopilot “porpoising.” End of manual excerpt It looks like you’re