Mount the aircraft (or use a gyro tilt stand) to a level flight attitude.

The KI 256 is a 3-inch (ATI) panel-mounted electrically driven attitude gyro with built-in Flight Director command bars. It receives pitch and roll steering commands from an external Flight Director computer (e.g., KFC 150/200/250 series). The instrument requires both (or optional 14 VDC with converter) and a regulated vacuum source for gyro spin-up and rigidity.

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

: Requires standard aircraft power (typically 14V or 28V depending on the specific mod) and a solid chassis ground.

Internally air-driven, requiring a regulated vacuum source of 4.5 in. Hg . Mechanical Installation