Robinson R44 Raven II — Wiring Diagram

This document is the Maintenance Manual for the Robinson R44 series, specifically detailing the electrical system of the aircraft. It provides comprehensive information on the electrical components, including battery specifications, installation procedures, and troubleshooting guidelines. The manual is intended for maintenance personnel and pilots who need to understand the electrical systems for safe operation and maintenance of the R44 helicopters. Key sections cover battery types, RPM governor functionality, lighting systems, and audio systems, along with safety precautions and maintenance schedules.

• 14-volt electrical systems use a 70-amp alternator; 28-volt systems use a 70-amp alternator limited to 64 amps continuous.
• The lithium-ion battery has a nominal charging voltage of 28.8 volts and includes built-in monitoring circuitry.
• The RPM governor is only active above 80% engine RPM and can be overridden by the pilot.
• Warning lights include indications for low oil pressure, low fuel, engine fire, and alternator failure.
• The carbon monoxide detector alerts the pilot to dangerous CO levels, requiring immediate action.