Section II Airframe Structures (Assembly and Rigging)

Question 1

What are three types of commonly used flight control systems?

Answer 1

The cable, push-pull tube, and the torque tube systems.

Question 2

What is used in large metal aircraft to keep control cable tension within acceptable limits?

Answer 2

Cable tension regulator.

Question 3

What is a fairlead?

Answer 3

A cable guide that slightly deflects straight run cables around structural features such as bulkheads.

Question 4

How much cable deflection is acceptable due to a fairlead?

Answer 4

3°

Question 5

where does failure of control cables occur most frequently?

Answer 5

Where cables pass over pulleys and through fairleads.

Question 6

Which flight control surfaces are considered the primary group?

Answer 6

Elevators, ailerons, and the Rudder.

Question 7

which flight controls are considered the secondary group?

Answer 7

Trim tabs, spring tabs, wingflaps, servo tabs, anti-servo tabs. They do not alone cause rotation of aircraft about its axis.

Question 8

Which flight controls are in the auxiliary group?

Answer 8

Flaps, speed breaks, spoilers, slats, leading edge slats, and slots.

Question 9

How do wing flaps affect landing speed and approach angle of an aircraft?

Answer 9

flaps increase the camber of a wing and therefore the lift of the wing, making it possible for the speed of the aircraft to be decreased without decreasing lift produced by the way.

Question 10

What is a balance tab?

Answer 10

In auxiliary control with fixed linkage that is designed in such a way that went a primary control surfaces moved the tab moves in the opposite direction. Aerodynamic forces acting on the tab assist a pilot in moving the control surface.

Question 11

What is a trim tab?

Answer 11

An auxiliary control that is designed to reduce the workload on pilot maintaining the desired flight attitude.

Hands off flight possible

Question 12

What is the purpose of the collective pitch control in a helicopter?

Answer 12

To change the pitch of main rotor blades therefore increasing or decreasing lift.

Question 13

Why is it important for the blades of a helicopter rotor system to be tracked?

Answer 13

To reduce vertical vibrations.

Question 14

What is the most efficient way to check a helicopter rotor for dynamic balance?

Answer 14

The use of a balance/analyzer computer.

Question 15

What unit on a helicopter is used to compensate for torque created by the main rotor?

Answer 15

The tail rotor

Question 16

what control operates the helicopter tail rotor?

Answer 16

The anti-torque pedals.

Question 17

What are the three axes of an aircraft, and which control surfaces caused the aircraft to move about each axis?

Answer 17

They are longitudinal, lateral, and vertical.

Longitudinal axis extends from nose to tail and uses ailerons for a roll.

The lateral axis extends from wing tip to wing tip using the elevators for pitch.

The vertical axis passes through the center of the airframe from top to bottom, and uses the rudder for yaw.

Question 18

When installing an aircraft bolt, what precaution would you take regarding the position of the bolt?

Answer 18

Where possible install the bolt head positioned on top or facing forward.

Question 19

How is the propellor torque corrected for during assembly and rigging and some single engine aircraft?

Answer 19

Some aircraft have the leading edge of the vertical stabilizer offset to the longitudinal centerline to counteract engine torque.

Question 20

What reference publications should be used to rig aircraft including the control system?

Answer 20

You should refer to the aircraft specifications or TCDS and also to the maintenance manual issued by the manufacturer.

Question 21

What are vortex generators?

Answer 21

Small law aspect ratio airfoils mounted on the upper surface of wings. Their function is to dampen shock induced separation of the airstream which results in a stall.

Question 22

What is a servo tab?

Answer 22

A cockpit controlled adjustable tab attached to the trailing edge of a primary flight control surface. The tab moves opposite the direction of the control surface producing an aerodynamic force that moves the primary control.

Question 23

What factors are used to determine the proper cable tension?

Answer 23

The size of the cable and the outside temperature.

Question 24

where can you find instructions for jacking one wheel of an aircraft to change a tire?

Answer 24

Aircraft maintenance manual.

Question 25

Why do control surfaces need to be statically balanced?

Answer 25

Because an out of balance control surface can cause severe flutter.

Question 26

What is a spring tab?

Answer 26

A flight control that uses a spring to assist control surface movement at high speeds.

Question 27

What tool can be used to measure control surface travel?

Answer 27

A protractor.