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Airframe Writtens > Assembly and Rigging > Flashcards

Assembly and Rigging Flashcards

1
Q

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

A

Torque and directional control.

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2
Q

The vertical flight of a helicopter is controlled by what?

A

Collective pitch changes.

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3
Q

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

A

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

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4
Q

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

A

through the center of gravity.

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5
Q

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

A

angle of attack.

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6
Q

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

A

tilting the main rotor disk in the desired direction.

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7
Q

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

A

relative position of the blades during rotation.

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8
Q

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

A

varying the pitch of the tail rotor blades.

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9
Q

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

A

less than the retreating blade.

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10
Q

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

A

track.

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11
Q

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

A

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

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12
Q

Which statement is correct concerning torque effect on helicopters?

A

Torque direction is the opposite of rotor blade rotation.

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13
Q

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

A

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

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14
Q

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

A

cyclic pitch control

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15
Q

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

A

cyclic pitch control

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16
Q

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

A

longitudinal axis

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17
Q

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?

A

Aircraft type certificate data sheet.

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18
Q

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

A

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

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19
Q

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

A

The vertical axis but not the longitudinal axis.

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20
Q

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

A

pitch

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21
Q

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

A

move toward the leading edge.

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22
Q

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

A

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

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23
Q

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

A

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

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24
Q

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

A

rudder

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25
Q

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

A

lateral axis

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26
Q

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?

A

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

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27
Q

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

A

Fowler flaps

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28
Q

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?

A

airplane to be off balance both laterally and directionally.

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29
Q

The chord of a wing is measured from…

A

leading edge to trailing edge.

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30
Q

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

A

also increase.

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31
Q

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

A

Span and chord.

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32
Q

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

A

lateral axis.

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33
Q

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

A

poor longitudinal stability

34
Q

The purpose of wing slats is to what?

A

reduce stalling speed.

35
Q

The angle of incidence of an airplane at rest…

A

does not change when in flight.

36
Q

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

A

An unsteady flow from turbulence.

37
Q

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

A

around or about the longitudinal axis controlled by the ailerons.

38
Q

The primary purpose of stall strips is to what?

A

stall the inboard portion of the wing first.

39
Q

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?

A

nose into the wind.

40
Q

The correct dihedral angel can be determined by what?

A

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

41
Q

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

A

front spar.

42
Q

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

A

Aircraft service or maintenance manual.

43
Q

Where is the buttock line or buttline of an aircraft?

A

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

44
Q

Where is fuselage station No. 137 located?

A

137 inches aft of the zero or fixed reference line.

45
Q

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

A

bubble level, and special fixtures described by the manufacturer.

46
Q

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

A

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

47
Q

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?

A

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

48
Q

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

A

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

49
Q

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

A

the full rated strength of the cable.

50
Q

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

A

Cotter pin

51
Q

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

A

minimum recommended torque plus friction drag torque.

52
Q

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

A

corrosion resistant steel.

53
Q

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?

A

rejected.

54
Q

The purpose of the vertical fin is to provide what?

A

directional stability.

55
Q

How are changes in direction of a control cable accomplished?

A

Pulleys.

56
Q

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

A

1/8 inch.

57
Q

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

A

to manufacturer’s specifications.

58
Q

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?

A

broken strands.

59
Q

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?

A

decrease when the aircraft structure and cables become cold.

60
Q

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

A

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

61
Q

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

A

pulley misalignment.

62
Q

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

A

3 degrees.

63
Q

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

A

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

64
Q

With which system is differential control associated?

A

Aileron.

65
Q

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

A

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

66
Q

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

A

worn attachment fittings.

67
Q

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

A

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

68
Q

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

A

lateral stability.

69
Q

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

A

assist the pilot in moving the control surfaces.

70
Q

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?

A

down and the elevator will move up.

71
Q

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?

A

Upward regardless of elevator position.

72
Q

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

A

down and the elevator will move down.

73
Q

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?

A

The airplane will be heavy on the controls.

74
Q

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?

A

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

75
Q

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

A

with the aileron in the NEUTRAL position.

76
Q

The universal propeller protractor can be used to measure what?

A

degrees of flap travel.

77
Q

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

A

3

78
Q

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

A

retain a set tension.

79
Q

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

A

117 pounds minimum, 143 pounds maximum.

80
Q

Differential control on an aileron system means that what?

A

The up travel is more than the down travel.

81
Q

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

A

so that air currents do not destabilize the scales.

82
Q

Which should be accomplished before jacking an aircraft?

A

Install critical stress panels or plates.

Airframe Writtens (34 decks)

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