For operators, maintenance teams, and parts buyers, understanding the major components of a helicopter is key to identifying issues, planning maintenance, and selecting the right replacement parts.

This guide breaks down each system and its critical components.

1. Main Rotor System

The core of every helicopter — responsible for lift, directional control, and overall stability.

Key components:

• Main rotor blades

• Rotor hub

• Swashplate

• Pitch links

• Dampers

2. Tail Rotor System

Provides anti-torque control and stabilizes the aircraft in yaw.

Includes:

• Tail rotor blades

• Gearboxes

• Driveshafts

• Pitch control mechanisms

3. Powerplant & Transmission

The system that generates and transfers power to the rotors.

Components:

• Engines (turbine or piston)

• Engine accessories

• Transmission assemblies

• Filters, oil pumps, hoses

4. Airframe & Structural Components

The structural framework of the helicopter.

Examples:

• Airframe elements

• Doors and panels

• Windows and windscreens

• Structural brackets and supports

5. Avionics & Electrical Systems

Essential for navigation, communication, and aircraft monitoring.

Includes:

• GPS and navigation systems

• Radios

• Digital displays

• Wiring harnesses and sensors

6. Mechanical, Control & Hydraulic Systems

Fundamental for aircraft movement and control.

Includes:

• Hydraulic pumps

• Flight control linkages

• Valves

• Mechanical actuators

7. Ground Support Equipment

Tools and equipment required for maintenance and inspection.

Examples:

• GSE units

• Specialized tools

• Test kits

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