If you are planning a new installation from scratch, consider alternatives:
Disclaimer: This guide is a general overview. Always refer to the authorized BendixKing Installation Manual for the specific unit and aircraft.
While this guide covers the core of the , you may need the full document for repair station sign-offs. Here are legitimate sources:
The FAA and other aviation authorities mandate that installations like this must be performed by a certified avionics repair station or an appropriately licensed individual (e.g., an A&P mechanic with avionics experience) and must be approved for return to service through an FAA Form 337 or a Supplemental Type Certificate (STC). ki 256 installation manual
Adjust the alignment potentiometers on the autopilot computer until the voltage is zeroed out. This prevents the autopilot from turning or diving unexpectedly when engaged in flight. Flight Director Command Bar Test Select "Flight Director" mode on the autopilot controller.
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.
Before removing the KI‑256, verify that the replacement is approved under an STC for your specific autopilot model, and that the backup flight director display requirements are satisfied. If you are planning a new installation from
: Apply a properly filtered and regulated 4.5 in. Hg vacuum source to spin up the gyro rotor. Allow the unit to stabilize completely for at least 15 minutes.
Although the exact pinout varies slightly depending on the autopilot model (KFC‑150, KFC‑200, etc.), a generic pinout is shown below.
The KI 256 is an electrically driven, gyro-stabilized horizon indicator that provides attitude information and, when connected to a flight computer, displays steering commands (command bars). Electrically driven (usually 14V or 28V DC). Role: Attitude Indicator + Flight Director (FD) Indicator. Here are legitimate sources: The FAA and other
The removal and installation of the KI 256 follow standard procedures for face-mounted instruments:
It displays aircraft attitude (pitch and roll) and integrates flight director commands when used with a compatible flight computer, such as the KC 295. The gyro in the KI 256 is air-driven, meaning it relies on your aircraft’s vacuum or pressure system for operation. This has important implications for the installation, as will be discussed later.