Identify the three flight control systems.
Cyclic, collective, anti-torque pedals
State the purpose of the cyclic control.
A cyclic control input will result in the rotor disc tilting and the aircraft moving in the direction of the control input.
Describe the sequence of events with a cyclic input.
As the cyclic moves it causes the pivot support to move. Pilot and copilot pivot supports are inter-connected by a torque tube. A yoke assembly connects to the top of each pivot support and transmits the cyclic input to the mixing lever located at the base of the control column. The mixing lever transmits the mixed (fore / aft with left/ right) cyclic input to the cyclic hydraulic servos ant the stationary swashplate. The hydraulic servos boost the mechanical input. The stationary swashplate tilts and there fore transmits the cyclic input to the rotating swashplate which tilts and provides input to the pitch change horns via the pitch change rods. NOTE: The stationary swashplate is mounted on the uniball which his what allows the stationary swashplate to tilt in any direction.
Identify the type of boost used with the flight controls.
State the purpose of the collective control.
The collective changes the pitch on both main rotor blades equally and in the same direction to give vertical control of the helo.
Described the sequence of events with a collective input.
The collective is connected to a jackstaff which is where the friction adjuster is mounted. Collective control inputs are transmitted through a lever assembly and control tube up to the hydraulic servo and the collective lever (item with “Top” on it in preflight). As the pilot pulls up on the collective, the collective lever is puled down. This will raise the pivot sleeve and uniball assembly and therefore raise the stationary and rotating swashplates which will increase the pitch equally on both main rotor blades via the pitch change rods and pitch change horns.
State the purpose of the anti-torque tail rotor.
To compensate for the torque effect of the main rotor and to allow control of the helo about the vertical axis.
Describe the composition of the tail rotor blades.
Aluminum honeycomb covered by stainless steel skin. Stainless steel doublers added at the foot for added strength. Stainless steel leading edge abrasion strips. Root end has an aluminum alloy retention block which houses two spherical bearings to mount the blade to the yoke.