Ki 256 Installation Manual May 2026

Use shielded MIL-W-22759/16 wire. Connect to aircraft via MS3112E14-18P (mating connector: MS3116F14-18S).

Pigtail connections (per rear connector pinout):

| 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 | ki 256 installation manual

Critical:

Many installations marry the KI 256 to a King autopilot. The ki 256 installation manual dedicates Appendix C to this interface. Use shielded MIL-W-22759/16 wire

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.

The most critical mechanical step often overlooked in the ki 256 installation manual is the mounting orientation. Many installations marry the KI 256 to a King autopilot

Given the lack of specifics about "ki 256," the above is a generic guide. For accurate and detailed instructions, it's best to consult the official documentation or contact the manufacturer directly.

Document P/N: 006-10565-00
Rev: C
Applicability: KI 256 Electric Attitude Indicator (14V & 28V systems)

From the field: A common mistake is skipping the 3-minute warm-up. Doing so leads to false nulls and autopilot “porpoising.”