The BendixKing KI 256 is an internally air-driven Flight Command Indicator that serves as a central component in BendixKing flight control systems like the KFC-150, KFC-200, KFC 225, and KFC 250. It provides a pictorial display of aircraft pitch and roll while supplying attitude reference signals to the flight computer. Core Installation Specifications
Static Protection: Always handle the unit at a static-safe workstation, as the internal circuit boards are highly sensitive to ESD. Alignment and Testing
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.
Service Bulletin 11 (SB 11): Many installations require this modification to reduce loading effects on pitch and roll outputs, particularly when paired with the KC-192 autopilot computer. This involves replacing the internal PC board. Handling Precautions
The KI 256 contains a caged gyro mechanism. Never apply power while the unit is unmounted or in a non-level aircraft attitude. This can topple the gyro and cause immediate failure.
is mandatory to prevent internal damage and ensure system precision.
Have a question about your KI 256 installation? Leave a comment below or contact our avionics helpdesk at support@avionics-tech.com.
