Assembly and Rigging

Question 1

The auxiliary (tail) rotor of a helicopter permits the pilot to compensate for and/or accomplish which of the following?

Answer 1

Torque and directional control.

Question 2

The vertical flight of a helicopter is controlled by what?

Answer 2

Collective pitch changes.

Question 3

A reduction in anti-torque thrust will cause the what?

Answer 3

tail to pivot in the direction of torque rotation around the main rotor axis.

Question 4

In rotorcraft external-loading, the ideal location of the cargo release is where the line of action passes what?

Answer 4

through the center of gravity.

Question 5

The acute angle formed by the chord line of a wing and the relative wind is known as the what?

Answer 5

angle of attack.

Question 6

A helicopter in forward flight, cruise configuration, changes direction by what

Answer 6

tilting the main rotor disk in the desired direction.

Question 7

The purpose in checking main rotor blade tracking is to determine the what?

Answer 7

relative position of the blades during rotation.

Question 8

In a hovering helicopter equipped with a tail rotor, directional control is maintained by what?

Answer 8

varying the pitch of the tail rotor blades.

Question 9

If a single-rotor helicopter is in forward horizontal flight, the angle of attack of the advancing blade is what?

Answer 9

less than the retreating blade.

Question 10

Main rotor blades that do not cone by the same amount during rotation are said to be out of what?

Answer 10

track.

Question 11

One purpose of the freewheeling unit required between the engine and the helicopter transmission is to what?

Answer 11

automatically disengage the rotor from the engine in case of an engine failure.

Question 12

Which statement is correct concerning torque effect on helicopters?

Answer 12

Torque direction is the opposite of rotor blade rotation.

Question 13

What is the purpose of the free-wheeling unit in a helicopter drive system?

Answer 13

It disengages the engine from the main rotor when engine RPM is less than rotor RPM.

Question 14

Movement about the longitudinal axis (roll) in a helicopter is effected by movement of the what?

Answer 14

cyclic pitch control

Question 15

Movement about the lateral axis (pitch) in a helicopter is effected by movement of the what?

Answer 15

cyclic pitch control

Question 16

Wing dihedral, a rigging consideration on most airplanes of conventional design, contributes most to stability of the airplane about its what?

Answer 16

longitudinal axis

Question 17

Other than the manufacturer maintenance manual, what other document could be used to determine the primary flight control surface deflection for an imported aircraft that is reassembled after shipment?

Answer 17

Aircraft type certificate data sheet.

Question 18

If a pilot reports that an airplane flies left wing heavy, this condition may be corrected by what?

Answer 18

increasing the angle of incidence of the left wing, or decreasing the angle of incidence of the right wing, or both.

Question 19

If the vertical fin of a single-engine, propeller driven airplane is rigged properly, it will generally by parallel to what?

Answer 19

The vertical axis but not the longitudinal axis.

Question 20

An airplane which has good longitudinal stability should have a minimum tendency to what?

Answer 20

pitch

Question 21

As the angle of attack of an airfoil increases, the center of pressure will what?

Answer 21

move toward the leading edge.

Question 22

The angle of incidence is that acute angle formed by what?

Answer 22

a line parallel to the wing chord and a line parallel to the longitudinal axis of the aircraft.

Question 23

An airplane’s center of lift is usually located aft of its center of gravity, …

Answer 23

so that the airplane will have a nose-heavy tendency.

Question 24

An airplane is controlled directionally about its vertical axis by the what?

Answer 24

rudder

Question 25

The elevators of a conventional airplane are used to provide rotation about the what?

Answer 25

lateral axis

Question 26

Washing-in the left wing of a monoplane, for purposes of rigging corrections after flight test, will have what effect on the lift and drag of that wing?

Answer 26

Both drag and lift will increase due to increased angle of attack.

Question 27

What type of flap system increases the wing area and changes the wing camber?

Answer 27

Fowler flaps

Question 28

If the right wing of a monoplane is improperly rigged to a greater angle of incidence than designated in the manufacturer's specifications, it will cause the what?

Answer 28

airplane to be off balance both laterally and directionally.

Question 29

The chord of a wing is measured from...

Answer 29

leading edge to trailing edge.

Question 30

When the lift of an airfoil increases, the drag will what?

Answer 30

also increase.

Question 31

What physical factors are involved in the aspect ratio of airplane wings?

Answer 31

Span and chord.

Question 32

Improper rigging of the elevator trim tab system will affect the balance of the airplane about its what?

Answer 32

lateral axis.

Question 33

An airplane that has a tendency to gradually increase a pitching moment that has been set into motion has what?

Answer 33

poor longitudinal stability

Question 34

The purpose of wing slats is to what?

Answer 34

reduce stalling speed.

Question 35

The angle of incidence of an airplane at rest...

Answer 35

does not change when in flight.

Question 36

Buffeting is the intermittent application of forces to a part of an airplane. It is caused by what?

Answer 36

An unsteady flow from turbulence.

Question 37

Movement of an airplane along its lateral axis (roll) is also movement...

Answer 37

around or about the longitudinal axis controlled by the ailerons.

Question 38

The primary purpose of stall strips is to what?

Answer 38

stall the inboard portion of the wing first.

Question 39

Rigging and alignment checks should not be undertaken in the open. However, if this cannot be avoided, the aircraft should be positioned with the what?

Answer 39

nose into the wind.

Question 40

The correct dihedral angel can be determined by what?

Answer 40

using a dihedral board and bubble level along the front spar of each wing.

Question 41

The dihedral angle of a wing may be measured by placing a straightedge and level protractor on the what?

Answer 41

front spar.

Question 42

Where would you find precise information to perform a symmetry alignment check for a particular aircraft?

Answer 42

Aircraft service or maintenance manual.

Question 43

Where is the buttock line or buttline of an aircraft?

Answer 43

A width measurement left or right of, and parallel to, the vertical centerline.

Question 44

Where is fuselage station No. 137 located?

Answer 44

137 inches aft of the zero or fixed reference line.

Question 45

Proper wing twist in a sheet metal constructed wing can usually be checked by utilizing a what?

Answer 45

bubble level, and special fixtures described by the manufacturer.

Question 46

The vast majority of aircraft control cables are terminated with swaged terminals, that must be what?

Answer 46

checked with a go-no-go gauge before and after, to show compliance with the manufacturer's requirements after the swaging operation.

Question 47

What nondestructive checking method is normally used to ensure that the correct amount of swaging has taken place when installing swaged-type terminals on aircraft control cable?

Answer 47

Use a terminal gauge to check the diameter of the swaged portion of the terminal.

Question 48

When inspecting a control cable turnbuckle for proper installation, determine that what?

Answer 48

the safety wire ends are wrapped a minimum of four turns around the terminal end shanks.

Question 49

If all instructions issued by the swaging tool manufacturer are followed when swaging a cable terminal, the resultant swaged terminal strength should be what?

Answer 49

the full rated strength of the cable.

Question 50

Which is an acceptable safety device for a castle nut when installed on secondary structures?

Answer 50

Cotter pin

Question 51

When installing a castle nut, start alignment with the cotter pin hole at the what?

Answer 51

minimum recommended torque plus friction drag torque.

Question 52

When used in close proximity to magnetic compasses, cotter pins are made of what material?

Answer 52

corrosion resistant steel.

Question 53

When a fiber or nylon insert-type self-locking nut can be threaded on a bolt or stud through the insert with only the fingers, it should be what?

Answer 53

rejected.

Question 54

The purpose of the vertical fin is to provide what?

Answer 54

directional stability.

Question 55

How are changes in direction of a control cable accomplished?

Answer 55

Pulleys.

Question 56

What is the smallest size cable that may be used in aircraft primary control systems?

Answer 56

1/8 inch.

Question 57

After repairing or re-covering a rudder, the surface should be rebalanced...

Answer 57

to manufacturer's specifications.

Question 58

Placing a piece of cloth around a stainless steel control cable and running it back and forth over the length of the cable is generally a satisfactory method of inspection for what?

Answer 58

broken strands.

Question 59

The cable-operated control system of an all-metal aircraft, not incorporating a temperature compensating device, has been rigged to the correct tension in a heated hangar. If the aircraft is operated in very cold weather, the cable tension will what?

Answer 59

decrease when the aircraft structure and cables become cold.

Question 60

Very often, repairs to a control surface require static rebalancing of the control surface. Generally, flight control balance condition may be determined by what?

Answer 60

The behavior of the trailing edge when the surface is suspended from its hinge points.

Question 61

Excessive wear on both of the sides of a control cable pulley groove is evidence of what?

Answer 61

pulley misalignment.

Question 62

Fairleads should never deflected the alignment of a cable more than...

Answer 62

3 degrees.

Question 63

Where does the breakage of control cable wires occur most frequently?

Answer 63

breakage usually occurs where cables pass over pulleys and through fairleads.

Question 64

With which system is differential control associated?

Answer 64

Aileron.

Question 65

Which statement concerning the 100-hour inspection of an airplane equipped with a push-pull tube-type control system is true?

Answer 65

The threaded rod ends should be checked for the amount of thread engagement by means of the inspection hole provided.

Question 66

If control cables are adjusted properly and the control surfaces tend to vibrate, the probable cause is what?

Answer 66

worn attachment fittings.

Question 67

Aircraft flight control trim systems must be designed and installed so that the what?

Answer 67

pilot can determine the relative position of the trim tab from the cockpit.

Question 68

Stability about the axis which runs parallel to the line of flight is referred to as what?

Answer 68

lateral stability.

Question 69

The purpose of spring tabs or servo tabs is to what?

Answer 69

assist the pilot in moving the control surfaces.

Question 70

If the control stick of an aircraft with properly rigged flight controls is moved rearward and to the left, the right aileron will move how?

Answer 70

down and the elevator will move up.

Question 71

Movement of the cockpit control toward the nose down position during a ground operation check of the elevator tab system will cause the trailing edge of the trim tab to move in which direction?

Answer 71

Upward regardless of elevator position.

Question 72

If the control stick of an aircraft with properly rigged flight controls is moved forward and to the right, the left aileron will move...

Answer 72

down and the elevator will move down.

Question 73

If the travel of an airplane's controls is correct but the cables are rigged exceptionally tight, what probable effect will this have when flying the airplane?

Answer 73

The airplane will be heavy on the controls.

Question 74

During inspection of the flight control system of an airplane equipped with differential-type aileron control side-to-side movement of the control stick will cause what?

Answer 74

each aileron to have a greater up travel (from the streamlined position) than down travel.

Question 75

A universal propeller protractor used to measure the degrees of aileron travel should be zeroed...

Answer 75

with the aileron in the NEUTRAL position.

Question 76

The universal propeller protractor can be used to measure what?

Answer 76

degrees of flap travel.

Question 77

(Refer to figure 8) Identify the cable that is used in primary control systems and in other places where operation over pulleys is frequently.

Answer 77

3

Question 78

A tension regulator in the flight control cable system of a large all-metal aircraft is used primarily to what?

Answer 78

retain a set tension.

Question 79

(Refer to figure 9.) When the outside air temperature is 80 degrees F, select the acceptable 3/16 cable tension range.

Answer 79

117 pounds minimum, 143 pounds maximum.

Question 80

Differential control on an aileron system means that what?

Answer 80

The up travel is more than the down travel.

Question 81

Why is it generally necessary to jack an aircraft indoors for weighing?

Answer 81

so that air currents do not destabilize the scales.

Question 82

Which should be accomplished before jacking an aircraft?

Answer 82

Install critical stress panels or plates.