Robinson R44 Raven II — Systems Description

This document provides a comprehensive systems description for the Robinson R44 helicopter, detailing its construction, systems, and operational procedures. It is intended for pilots and maintenance personnel to understand the various systems that make up the R44, including the rotor systems, drive system, powerplant, flight controls, and more. Each section outlines critical components, their functions, and maintenance considerations, ensuring safe and efficient operation of the aircraft. The information is essential for both routine operations and troubleshooting, making it a vital resource for anyone involved with the R44.

• The R44 is a four-place helicopter with a single main rotor and skid-type landing gear.
• Powered by a Lycoming O-540 engine, it features a wet sump oil system and various engine components.
• The fuel system is gravity-fed, requiring pre-flight fuel sampling from all tanks.
• The hydraulic system operates at 450 to 500 psi, providing boosted controls for easier handling.
• Electrical systems vary between 14-volt and 28-volt configurations, with specific cautions for operation.