A&p O&o Airframe Section Vi Aircraft Control Surfaces, Rigging, And Jacking

Front 1

What is the function of aileron an airplane?

Back 1

Rotates the airplane along its longitudinal axis.

Front 2

What is a stabilator?

Back 2

A single piece of horizontal tail surface that acts as both the horizontal stabilizer and the elevators. It pivots about its front spar.

Front 3

What is the function of the elevators on an airplane?

Back 3

Rotates the airplane about its lateral axis.

Front 4

What is the function of the rudder on an airplane?

Back 4

Rotate the airplane about its vertical axis.

Front 5

What is the purpose of an aileron balance cable?

Back 5

It ties the aileron together in such a way that when one aileron deflects downwards the other is pulled upward.

Front 6

What is an aerodynamically balanced control surface?

Back 6

A surface with a part of its area ahead of the hinge line. When the surface is deflected the portion ahead of the hinge aids the movement.

Front 7

What is meant by differential aileron travel?

Back 7

When the upward movement deflects a greater distance than the downward movement. Upward movement produces parasite drag to counteract the induced drag produced by the downward movement.

Front 8

What is a frise aileron?

Back 8

An aileron with its hinge line setback from the leading edge so that when it's deflected upward, part of the leading edge projects below the wing and produces parasite drag to help overcome adverse yaw.

Front 9

What is a ruddervator?

Back 9

Movable control surfaces on a V-tail airplane that are controlled by both the rudder pedals and the control yoke.

Hint 9

Moving the yoke in or out, the ruddervator move together and act as elevators, and when the pedal is depressed the ruddervator move differentially and act as rudders.

Front 10

How much is a fairlead allowed to deflect on a control cable?

Back 10

No more than 3°

Front 11

Why are the control cables of large airplanes normally equipped with automatic tension regulators?

Back 11

to keep the cable tension constant as the dimensions of the aircraft change due to a large amount of aluminum on the aircraft, which contracts with the temperature changes in flight so much so that the cables could become dangerously loose.

Front 12

In what publication could you find the correct control surface movement for a particular airplane?

Back 12

The type certificate datasheet for that airplane.

Front 13

What causes dissymmetry of lift produced by the rotor of a helicopter?

Back 13

The forward speed of the helicopter.

Hint 13

As the forward rotor blade travels with the helicopter flying it produces more lift than the blade that is traveling rearward.

Front 14

Why do single-rotor helicopters use an auxiliary rotor on their tail?

Back 14

To counteract the torque produced by the main rotor.

Front 15

Why is it important that the blades of a helicopter rotor system be in track?

Back 15

To prevent vertical vibration.

Front 16

What is the function of the collective pitch control of a helicopter?

Back 16

Controls the vertical flight of the helicopter by changing the pitch of the blades at the same time.

Front 17

What is the function of the cyclic pitch control?

Back 17

Controls lateral movement of the helicopter by changing the blades at particular points in their rotation to tilt the plane of the rotor.

Front 18

What is the function of a tail rotor on a single main rotor helicopter?

Back 18

It counteracts the torque of the main rotor to control the yaw of the helicopter.

Hint 18

The control pedals change the pitch of the tail rotor blades to vary the thrust.

Front 19

What is the purpose of the stabilizer system I'm a helicopter?

Back 19

Because the helicopter is statically stable but dynamically unstable, the stabilizer system restores the helicopter to level flight when outside forces causes it to pitch or roll.

Front 20

What is meant by a fully articulated Rotor system?

Back 20

System in which the individual blades are free to flap, drag and feather.

Front 21

What is meant by semirigrid rotor system?

Back 21

A two blade rotor system in which the blades can feather, but cannot flap nor drag.

Front 22

What is meant by a rigid rotor system?

Back 22

A rotor system that has freedom of motion about it's feather axis only the flexibility of the blade is sufficient to provide the needed flapping and dragging.

Front 23

What is the basic cause of low- frequency lateral vibration?

Back 23

The main rotor blades being out of static balance.

Front 24

What is the basic cause of low- frequency vertical vibration?

Back 24

When one of the main rotor blades produces more lift than the other.

Front 25

What is usually the cause of a high frequency vibration?

Back 25

The engine, cooling fan, or tail rotor.

Front 26

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

Back 26

By using a special computerized analyzer or balancer

Front 27

Why is it important that the control surface be statically balanced?

Back 27

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

Front 28

Where can you find the specifications for balancing the control surfaces of an airplane?

Back 28

In the aircraft maintenance manual

Front 29

What in addition to static unbalance can cause a control surface to flutter?

Back 29

Worn hinges or improperly adjusted control cable tension.

Front 30

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

Back 30

The aircraft maintenance manual.

Front 31

Where can you find instructions for jacking the complete aircraft to perform landing gear retraction test?

Back 31

The aircraft maintenance manual.

Front 32

Where can you find instructions for hoisting and aircraft to replace Wheels with floats?

Back 32

In the aircraft maintenance manual.