Ki 256 Installation Manual File
: The indicator supplies pitch and roll signals to flight computers like the .
From the field: A common mistake is skipping the 3-minute warm-up. Doing so leads to false nulls and autopilot “porpoising.”
The is a foundational piece of avionics, serving as both a primary attitude indicator and a command bar flight director for many general aviation aircraft. As part of the KFC 150/200 autopilot systems, the KI 256 (P/N 060-0017-00, etc.) requires precise installation to ensure accurate flight guidance and gyro performance.
The KI 256 requires a standard 3-1/8 inch (79.4 mm) round cutout. The mounting tray (usually P/N 070-01048-0002) must be aligned so the indicator’s face is perpendicular to the aircraft’s longitudinal axis. Use a level to set the tray within ±0.5° of the aircraft’s level flight attitude. ki 256 installation manual
Because it outputs critical pitch and roll analog voltages to the autopilot, precise installation and calibration are vital for flight safety. This technical guide synthesizes structural, electrical, and pneumatic data required for a successful installation. 1. Pre-Installation Specifications and Requirements
: Confirm that the dash number matches the panel tilt angle of the target aircraft. Installing an 8-degree unit in a 0-degree panel causes persistent pitch bias during autopilot engagement.
. This modification involves replacing the Command Bar Board to reduce loading effects on pitch and roll outputs, particularly when used with certain autopilot computers. Alignment Procedure : The indicator supplies pitch and roll signals
The KI 256 is a critical piece of avionics. It combines a vacuum-driven attitude gyroscope with a flight director indicator. It serves as the primary attitude source for many legacy autopilot systems, including the King KFC 200 and KFC 225.
| Symptom | Likely Cause | Solution | |---------|--------------|----------| | OFF flag visible | No vacuum or gyro not spun up | Check vacuum line and electrical power | | Roll flag only | Missing roll command return (pin H) | Verify wiring continuity | | Bars stuck full scale | Command signal shield grounded at KI 256 | Remove ground loop — shield only at source | | Erratic attitude | Vacuum too high or low | Adjust regulator to 5.0 inHg | | No backlight | Voltage mismatch (28V to 5V lamp) | Install dropping resistor per manual Fig 6-3 |
Approximately 1.0 Amp maximum at standard operational voltage. As part of the KFC 150/200 autopilot systems,
The official installation manual is typically:
Check the internal lighting by adjusting the cabin dimmer switch. Autopilot Alignment
Overhauls must be performed in a clean room environment to prevent gyro contamination. 6. Common Issues and Troubleshooting
The BendixKing KI 256 serves as a critical attitude and flight command indicator, requiring strict adherence to engineering standards for installation and integration with legacy autopilots. Key procedures include implementing Service Bulletin 11 for modified command bar boards and precise pneumatic calibration at 4.5 in. Hg. Detailed installation, modification, and maintenance, including Service Bulletin 11, can be found in the documentation provided by peter2000.co.uk KI 256 Flight Command Indicator
if the flight director or autopilot is engaged for more than 5 minutes to prevent damaging the command bar system. Delicate Handling
