Ki — 256 Installation Manual

BendixKing KI 256 is a critical flight command indicator that serves as a cornerstone for several legacy autopilot systems, including the KFC-150, KFC-200, KFC 225, and KFC 250. Its installation and maintenance are complex because it is not merely a display instrument; it is a self-contained vertical gyro that supplies vital pitch and roll attitude data to the flight computer. Technical Overview and Specifications

Route the wiring harness away from high-current power cables and radio antenna lines to prevent interference. 3. Vacuum and Pressure Line Connection

If you plan to keep the KI 256, download and print the manual now—digital copies may become harder to find as avionics OEMs purge legacy documents.

The 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

| Pin | Function | Wire AWG | Notes | |-----|----------|----------|-------| | A | +28 VDC (Gyro motor) | 22 | Switched by gyro circuit breaker | | B | DC Ground | 22 | Return for gyro motor & electronics | | C | +28 VDC (Flight Director logic) | 24 | Optional, from FD computer | | D | Pitch command (analog ±6V) | 24 | Shield to pin E at source | | E | Pitch command return | 24 | Shield drain ground at computer | | F | Roll command (analog ±6V) | 24 | Shield to pin H at source | | H | Roll command return | 24 | Shield drain ground at computer | | J | Backlight Hi | 22 | 5V AC/DC max | | K | Backlight Lo | 22 | Return | | L | Instrument ground | 22 | Connect to avionics ground bus |

Cause: Incorrect lighting or invalid flag voltage logic from the computer.

14 VDC or 28 VDC (depending on the specific mod suffix) BendixKing KI 256 is a critical flight command

: Position the KI 256 squarely in the pilot's primary field of view (the top-center position of the standard "Basic T" instrument cluster).

The instrument fits a standard 3-inch ATI cutout.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. | Pin | Function | Wire AWG |

Before initiating any mechanical or electrical integration work, a rigorous quality check must be performed on the bench:

The KI 256 is designed to work with BendixKing's KFC-150, KFC-200, KFC 225, and KFC 250 Flight Control Systems. It can be integrated with King's KTS 150 Autopilot Test Set, a specialized tool placed in series with the autopilot computer and aircraft harness. During calibration, the KI 256 is placed on a gyro test stand for precise gyro and computer calibration.

Before beginning installation, ensure the unit matches your aircraft's electrical and physical configuration.

Measure the AC voltage outputs on Pins E/F (Roll) and Pins G/H (Pitch). They must read 0.0 VAC ( ±plus or minus 50mV) when the aircraft is perfectly level.

Here’s a recap of the essential steps you’ll need to take for a successful installation: