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OP structure rigging
| Question | Answer |
|---|---|
| what is the function of a vortex generator? | Small low profile airfoils on the upper surface of the wing. It is designed to delay or prevent separation of the boundary layer. |
| What are the three axes of an airplane and what control surfaces move the aircraft about those axis? | Ailerons about the Longitudinal, Elevators about the Lateral, Rudder about the Vertical. |
| What are the three primary flight controls of an aircraft? | The ailerons, elevators, rudder. |
| Name several secondary flight controls and describe their general purpose. | Trim tabs such as balance tabs, anti-servo and servo tabs, and spring tabs. Their function is to assist the pilot in moving the controls and to trim the aircraft to fly hands-off. |
| Name several types of auxiliary flight controls and describe their general purpose? | Various high lift devices used during low speed flight such as leading and trailing edge flaps, slats, slots, speed brakes etc. |
| What is a servo trim tab? | An auxiliary control, adjustable and positioned by the movement of a cockpit control and designed to create aerodynamic forces to assist in moving a control surface. |
| What is a spring tab. | Auxiliary flight control that aids the movement of a primary control at high speeds when control forces are to high with use of a spring. |
| What is a balance trim tab? | Auxiliary flight control that aids a primary flight control. Tab is positioned by a control rod connected to a fixed surface on the same side as the horn on the tab. It deflects the opposite direction of the primary control surface. |
| What are the four most common types of high lift devices? | Leading and trailing edge flaps, slats and slots. |
| Describe some of the tools used to check control surface travel? | A universal propeller protractor or special control surface protractor. |
| Name three mechanical methods by which flight control systems may be actuated (commonly used flight control systems)? | Cables, Push pull rods, Torque tubes. |
| What is a fairlead? | It is a device to prevent a cable from rubbing on the aircraft structure. |
| What are the most likely places for a control cable to wear or break? | Where the cables pass over pulleys or through fairleads. |
| What information is required before a cable rigging chart can be used? | The ambient temperature and the cable size. |
| What is the function of a cable tension regulator? | It automatically adjust the cable tension to compensate for expansion and contraction in the aircraft structure. |
| Describe the function of a rotorcraft collective pitch control? | The collective pitch control causes each rotor blade to change its pitch by an equal amount increasing or decreasing the lift produced by the rotor. |
| Describe the function of a rotorcraft cyclic pitch control? | It tilts the main rotor disc by changing the pitch angle of each rotor during its cycle of rotation, which causes the helicopter to move in the direction the rotor tilts. |
| What mechanism is most commonly used to compensate for the torque produced by the main rotor of a helicopter? | The tail or anti torque rotor. |
| How is the amount of thrust produced by the tail rotor controlled? | BY moving the foot pedals. |
| Why should control surfaces be locked when an aircraft is parked? | To prevent damage from the wind. |
| How much cable deflection is acceptable in a fairlead? | 3 degrees. |
| What is used in large metal aircraft to keep control cable tension within acceptable limits? | A cable tension regulator. |
| Where does the failure of control cables occur most often? | Where they pass over pulleys or fairleads. |
| How do wing flaps affect landing speed and approach angle of attack? | Use of flaps increases wing camber which increases lift allowing the aircraft to fly at a lower air speed without reducing lift. This allows a steeper glide angle and lower landing speed. |
| Why is it important for the blades of a helicopter to be tracked? | To reduce vertical vibrations. |
| What is the most efficient way to check a helicopter for dynamic balance? | The use of a balance analyzer computer. |
| When installing a bolt what precaution would you take regarding the position of the bolt? | Bolt head should be installed up if vertical and forward if installed horizontally, this will prevent the bolt from leaving the hole if the locking feature fails. |
| How is the propeller torque compensated for during assembly and rigging of a single engine aircraft? | Some aircraft have the leading edge of the vertical stab offset from the longitudinal center line. |
| What reference publication should be used to rig aircraft, including the control system? | Type certificate data sheet, aircraft specifications, Manufacturers maintenance manual. |
| Why do control surfaces have to be statically balances? | To prevent flutter and vibration. |
| Why is it specially important that the leading edge of a wing and the upper surface of the forward half of the wing be kept free of dents and any dirt or contamination? | The air flowing over this portion of the wing must be smooth to produce the maximum amount of lift. If the surface is rough or dirty, the air flow will be distorted and lift will be lost. |
| What is meant by the angle of attack of an airplane wing? | The acute angle that is formed between the chord line of an airfoil and the direction of the air that strikes it. |
| What are the four basic forces that act on an aircraft in flight? | Lift, drag, thrust, and gravity. |
| What is meant by the angle of incidence of an airplane wing? | The acute angle that is formed between the chord line of an airfoil and the longitudinal axis of the aircraft on which it is mounted. |
| What causes parasite drag on an airplane? | The friction of the air flowing over the surface. |
| Does the lift that is produced by the horizontal tail surfaces of an airplane act upward or downward in normal flight? | downward. |
| What is the function of lateral dihedral in the wings of an airplane? | Lateral dihedral gives the aircraft roll stability, or stability about the longitudinal axis. |
| What is the purpose of a stall strip on an airplane wing? | Stall strips distort the air flowing over the top of the wing in the root area at high angles of attack. They cause the root of the wing to stall out at a lower angle of attack than the portion of the wing ahead of the ailerons. |
| Why do most high-performance aircraft use slotted flaps? | Slotted flaps can be deflected to a greater angle than other types of flaps before the airflow over their surface breaks away. |
| What is the purpose of a movable slat in the leading edge of some airplane wings? | When the angle of attack becomes high, the slat automatically moves out of the wing and forms a duct which forces the air back over the upper surface of the wing. This delays the stall. |
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g153511
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