Cessna Citation X — Wiring Diagram

This document provides a detailed electrical system overview for the Cessna Citation XLS, focusing on the distribution of electrical power from various sources including the battery, Auxiliary Power Unit (APU), and starter/generators. It is intended for pilots and maintenance personnel who need to understand the electrical architecture of the aircraft. Key components such as the battery system, generator control units, and the operation of the electrical buses are described in detail, along with operational procedures for starting the engines and managing electrical power during flight and ground operations.

• The Citation XLS uses a 44-amp battery for engine starting and emergency power.
• Each starter/generator is rated at 200 amps during ground idle and 300 amps at maximum altitude.
• Battery temperature must remain below 63°C (145°F) to avoid overtemperature warnings.
• The GCU regulates voltage at 28.5 VDC and provides overvoltage protection at 35.0 VDC.
• External power units must provide 28 volts with a nominal capability of 1000 amperes.