Podcast
Questions and Answers
What angle should the pitch stick be positioned in for low pitch?
What angle should the pitch stick be positioned in for low pitch?
How many turns should the rod be shortened when adjusting the cylinder piston and valve?
How many turns should the rod be shortened when adjusting the cylinder piston and valve?
What is the required dimension between the collective lever and the support below it when adjusting to high pitch?
What is the required dimension between the collective lever and the support below it when adjusting to high pitch?
Where should the collective pitch sleeve be marked for high pitch position in relation to the first mark?
Where should the collective pitch sleeve be marked for high pitch position in relation to the first mark?
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What should be done with the friction on the collective stick before moving it for high pitch adjustment?
What should be done with the friction on the collective stick before moving it for high pitch adjustment?
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Which flight control system is primarily responsible for moving the helicopter in a forward or rearward direction?
Which flight control system is primarily responsible for moving the helicopter in a forward or rearward direction?
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What mechanism does the cyclic control system use to transmit movement to the main rotor hub?
What mechanism does the cyclic control system use to transmit movement to the main rotor hub?
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What is the primary purpose of the tail rotor system?
What is the primary purpose of the tail rotor system?
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Which system is recommended to be rigged first when both cyclic and collective systems need adjustment?
Which system is recommended to be rigged first when both cyclic and collective systems need adjustment?
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What component assists in providing stability about the longitudinal and horizontal axis of the helicopter?
What component assists in providing stability about the longitudinal and horizontal axis of the helicopter?
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Which method is NOT used by the collective pitch control system to transmit movement to the main rotor hub?
Which method is NOT used by the collective pitch control system to transmit movement to the main rotor hub?
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Which of the following tolerances is NOT applicable for the angular settings during rigging?
Which of the following tolerances is NOT applicable for the angular settings during rigging?
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What is the function of the synchronized elevator in relation to the cyclic control system?
What is the function of the synchronized elevator in relation to the cyclic control system?
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Study Notes
Helicopter Flight Controls
- Helicopters are controlled by three flight control systems: Cyclic, Collective Pitch, and Tail Rotor
- The Cyclic Control System manipulates main rotor attitude by changing blade pitch
- Cyclic Control System components include:
- Push-pull tubes
- Torque tubes
- Bellcranks
- Boost cylinders
- Swashplate
- The Collective Pitch Control System adjusts the pitch of all main rotor blades simultaneously
- The Collective Pitch Control System components include:
- Push-pull tubes
- Torque tubes
- Bellcranks
- Tail Rotor System provides directional (yaw) control and compensates for engine torque
- Tail Rotor system components include:
- Pedals
- Cables
- Pitch change mechanism
- Tail rotor blades
- Rigging is a critical step after installation or replacement of control system components
- Rigging involves ensuring proper alignment and adjustment of system components to achieve desired response
Rigging Collective Pitch System on Model 47G-4
- Key tolerances are 1º for angles and 0.06 inches for dimensions
- Low pitch blade angles should be checked before flight
- Level the helicopter and ensure the main rotor mast is vertically aligned
- Position the pitch stick at 37.5º above horizontal and adjust the low pitch stop
- Bottom the cylinder piston and adjust the rod length
- Adjust the collective lever screw to maintain a 1.075 inch dimension and low sleeve position
- Adjust the link rod to achieve a 2.97 inch dimension and low pitch positioning
- With the system in low pitch, push down on the cylinder piston, adjust the tube assembly to fit and shorten the rod by 1/2 turn
- Move the collective pitch sleeve boot up on the mast
- Mark the mast at the end of the collective pitch sleeve and 0.84 inch above for high pitch positioning
- Move the collective stick to the high pitch position and adjust the high pitch stop
- Adjust rigging aid screws to ensure gaps of 0.20 inches with collective stick at both low and high pitch positions
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Description
This quiz covers the fundamental components and systems of helicopter flight controls, including the Cyclic, Collective Pitch, and Tail Rotor systems. Understand how each control system functions and the importance of rigging for optimal performance. Perfect for aviation enthusiasts and students alike.
