Assembly and Rigging Flashcards
The auxiliary (tail) rotor of a helicopter permits the pilot to compensate for and/or accomplish which of
the following?
Torque and directional control
The vertical flight of a helicopter is controlled by
Collective pitch changes
A decrease in pitch angle of the tail rotor blades on a helicopter
Causes the tail to pivot in the direction of torque rotation around the main rotor axis
In rotorcraft external-loading, the ideal location of the cargo release is where the line of action passes
Through the center of gravity at all times
The acute angle formed by the chord line of a wing and the relative wind is known as the
Angle of attack
A helicopter in forward flight, cruise configuration, changes direction by
Tilting the main rotordisk to the desired direction
The purpose in checking main rotor blade tracking is to determine the
Relative position of the blades during rotation
In a hovering helicopter equipped with a tail rotor, directional control is maintained by
Varying the pitch of the tail rotor blade
If a single-rotor helicopter is in forward horizontal flight, the angle of attack of the advancing blade is
Less than the retreating blade
Main rotor blades that do not cone by the same amount during rotation are said to be out of
Track
One purpose of the freewheeling unit required between the engine and the helicopter transmission is to
Automatically disengage the rotor from the engine in case of an engine failure
Which statement is correct concerning torque effect on helicopters?
Torque direction is the opposite of the rotor blade rotation
What is the purpose of the free-wheeling unit in a helicopter drive system?
It disconnects the rotor whenever the engine stops or slows below the equivalent of rotor rpm
Movement about the longitudinal axis (roll) in a helicopter is effected by movement of the
Cyclic pitch control
Wing dihedral, a rigging consideration on most airplanes of conventional design, contributes most to
stability of the airplane about its
Longitudinal axis
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?
Aircraft type certificate date sheet
If the vertical fin of a single-engine, propeller-driven airplane is rigged properly, it will generally be
parallel to
The vertical axis but not the longitudinal axis
An airplane which has good longitudinal stability should have a minimum tendency to
Pitch
As the angle of attack of an airfoil increases, the center of pressure will
Move toward the leading edge
The angle of incidence is that acute angle formed by
A line parallel to the wing chord and a line parallel to the longitudinal axis of the aircraft
An airplane’s center of lift is usually located aft of its center of gravity
So that the airplane will have a nose heavy tendency
An airplane is controlled directionally about its vertical axis by the
Rudder
The elevators of a conventional airplane are used to provide rotation about the
Lateral axis
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?
Both drag and lift will increase due to increased angle of attack
What type of flap system increases the wing area and changes the wing camber?
Fowler flaps
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
Airplane to be off balance both laterally and directionally
The chord of a wing is measured from
Leading edge to trailing edge
When the lift of an airfoil increases, the drag will
Also increase
What physical factors are involved in the aspect ratio of airplane wings?
Span and chord
Improper rigging of the elevator trim tab system will affect the balance of the airplane about its
Lateral axis
An airplane that has a tendency to gradually increase a pitching moment that has been set into motion
has
Poor longitudinal stability
The purpose of wing slats is to
Reduce stalling speed
The angle of incidence of an airplane at rest
Does not change when in flight
Buffeting is the intermittent application of forces to a part of an airplane. It is caused by
An unsteady flow from turbulence
Movement of an airplane along its lateral axis (roll) is also movement
Around or about the longitudinal axis controlled by the ailerons
The primary purpose of stall strips is to
Provide added lift at high angles of attack
Rigging and alignment checks should not be undertaken in the open; however, if this cannot be avoided,
the aircraft should be positioned
With the nose into the wind
The correct dihedral angle can be determined by
Using a dihedral board and bubble level along the front spar of each wing
The dihedral angle of a wing may be measured by placing a straightedge and level protractor on the
Front spar
Where would you find precise information to perform a symmetry alignment check for a particular
aircraft?
aircraft service or maintenance manual
Where is the buttock line or buttline of an aircraft?
A width measurement left or right of, and parallel to the vertical centerline
Where is fuselage station No. 137 located?
137 inches aft of the zero or fixed reference line
Proper wing twist in a sheet metal constructed wing can usually be checked by utilizing a
Bubble level and special fixtures described by the manufacturer
The vast majority of aircraft control cables are terminated with swaged terminals, that must be
Check with a go no go gauge before and after, to show compliance with the manufacturers
requirements after the swaging operation
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?
Use a terminal gauge to check the diameter of the swaged portion of the terminal
When inspecting a control cable turnbuckle for proper installation, determine that
The safety wire wrapped a minimum of four turns around the terminal end shanks
If all instructions issued by the swaging tool manufacturer are followed when swaging a cable terminal,
the resultant swaged terminal strength should be
A full rated strength of the cable
Which is an acceptable safety device for a castle nut when installed on secondary structures?
Cotter pin
When used in close proximity to magnetic compasses, cotter pins are made of what material?
Corrosion resistant steel
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
Rejected
The purpose of the vertical fin is to provide
Directional stability
How are changes in direction of a control cable accomplished?
Pulleys
What is the smallest size cable that may be used in aircraft primary control systems?
1/8 inch
After repairing or re-covering a rudder, the surface should be rebalanced
To manufacturer specification
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
Inspecting for broken wires
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
Decrease when the aircraft structure and cables become cold
Very often, repairs to a control surface require static rebalancing of the control surface. Generally, flight
control balance condition may be determined by
The behavior of the trailing edge when the surface is suspended form its hinge points
Excessive wear on both of the sides of a control cable pulley groove is evidence of
Pulley misalignment
Fairleads should never deflect the alignment of a cable more than
3 degrees
Where does the breakage of control cable wires occur most frequently?
Breakage usually occurs where cables pass over pulleys and through fairleads
With which system is differential control associated?
Ailerons
Which statement concerning the 100-hour inspection of an airplane equipped with a push-pull tube- type control system is true?
The threaded rod ends of the turnbuckles should be checked for the amount of thread engagement
by means of the hole provided
If control cables are adjusted properly and the control surfaces tend to vibrate, the probable cause is
Worn attachment fittings
Aircraft flight control trim systems must be designed and installed so that the
Pilot can determine the relative position of the trim tab from the cockpit
Stability about the axis which runs parallel to the line of flight is referred to as
Lateral stability
The purpose of spring tabs or servo tabs is to
Assist the pilot in moving the control surfaces
If the control stick of an aircraft with properly rigged flight controls is moved rearward and to the left,
the right aileron will move
Down and the elevator will move up
Movement of the cockpit control toward the nosedown position during a ground operational check of
the elevator trim tab system will cause the trailing edge of the trim tab to move in which direction?
Upward regardless of the elevator position
If the control stick of an aircraft with properly rigged flight controls is moved forward and to the right,
the left aileron will move
Down and elevator will move down
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?
The airplane will be heavy on controls
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
Each aileron to have a greater up travel (from the streamlined position) than down travel
A universal propeller protractor used to measure the degrees of aileron travel should be zeroed
With the aileron in the neutral position
The universal propeller protractor can be used to measure
Degrees of flap travel
(Refer to Figure 8.) Identify the cable that is used in primary control systems and in other places where
operation over pulleys is frequent.
3
A tension regulator in the flight control cable system of a large all-metal aircraft is used primarily to
Retain a set tension
(Refer to Figure 9.) When the outside air temperature is 80°F, select the acceptable 3/16 cable tension
range.
117 pounds minimum, 143 pounds maximum
Differential control on an aileron system means that
The up travel is more than the down travel
Why is it generally necessary to jack an aircraft indoors for weighing?
So that air currents do not stabilize the scale
If a pilot reports that an airplane flies left wing heavy, this condition may be corrected by
Increasing the angle of incidence of the left wing, or decreasing the angle of incidence of the right ,
or both
