> For the complete documentation index, see [llms.txt](https://bell-505-guide.gitbook.io/bell-505-maintenance-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bell-505-guide.gitbook.io/bell-505-maintenance-guide/system-descriptions/flight-control-systems/rotor-flight-controls.md).

# Rotor Flight Controls

The main rotor and tail rotor flight control systems consisting of cyclic, collective, and directional controls are used to adjust the helicopter attitude, altitude, and direction of flight. They consist of the systems that follow:

* [Main rotor controls](#main-rotor-controls)
* [Anti-torque rotor control](#anti-torque-rotor-control)
* [Servo-control system](#servo-control-system)

If the dual controls kit is installed, collective, cyclic, and anti-torque controls are also provided to the copilot. Refer to [Dual Control Kit](/bell-505-maintenance-guide/system-descriptions/flight-control-systems/rotor-flight-controls/dual-controls-kit.md) for details.

## Main rotor controls

The main rotor controls change the pitch angle of the main rotor blades. This changes the amount of thrust of the main rotor and also the direction in which this thrust is applied, providing control of the pitch (longitudinal) and the roll (lateral) attitudes of the helicopter. Main rotor control inputs are converted to linear motion under the cabin floor and passed upwards to three hydraulic servo actuators by bellcranks, a mixing lever and control tubes. To provide a fully open cabin, the controls are routed upwards through a control tunnel which is centrally located aft of the aft passenger bulkhead. It consists of the systems that follow:

* [Collective control system](/bell-505-maintenance-guide/system-descriptions/flight-control-systems/rotor-flight-controls/collective-control-system.md)
* [Cyclic control system](/bell-505-maintenance-guide/system-descriptions/flight-control-systems/rotor-flight-controls/cyclic-control-system.md)

## Anti-torque rotor control

The anti-torque rotor control lets the operator control the thrust provided by the tail rotor to counteract the torque produced by the main rotor and control the yaw (heading) of the helicopter. For a system discussion and/or description, refer to [Anti-Torque Rotor Control](/bell-505-maintenance-guide/system-descriptions/flight-control-systems/rotor-flight-controls/anti-torque-control-system.md).

## Servo-control system

The servo-control system uses hydraulic pressure from the [hydraulic system](/bell-505-maintenance-guide/system-descriptions/flight-control-systems/hydraulic-power.md) to boost the main rotor controls, assisting the operator in moving those controls. For a system discussion and/or description, refer to [Servo-Control System](/bell-505-maintenance-guide/system-descriptions/flight-control-systems/rotor-flight-controls/servo-control-system.md).