Hardware
What is the proper thread exposure beyond a nut? (min and max)
What areas of a cable is considered critical fatigue areas?
At pulleys, Where it could be flexed rubbed or worked, 1 foot from a swaged fitting
What is stability about longitudinal axis called? What is it controlled by?
Lateral stability
Wing dihedral
What is the two parts that go into the aspect ratio formula?
Span/Chord
Which direction does the direction of torque move in reference to the main rotor?
The opposite direction of the main rotor blade.
What is the head marking for a standard AN bolt?
An X or Asterisk
What are the guideline regarding turnbuckle thread engagement according to AC 43.13?
Three threads out, Four threads in (initial installation)
Positive stability means what?
Has a tendency to return to its neutral position.
Where should you measure to find an aircraft's dihedral?
The front spar
Vertical flight of a helicopter is controlled by what?
The Collective
Where are Nylon self locking nuts not allowed to be used?
In areas subject to rotation or in areas above 250 degrees
What type of cables are considered to be flexible?
7X19, 7X7, 3X7
Non flexible: 1X7, 1X19
What are the 5 stresses on structures?
Torsion, compression, shear, bending, and tension
What does camber mean?
The curvature of an airfoil.
Define gyroscopic procession
Causes a force to act about 90 degrees in the direction of rotation from the input of the force.
3
What inspection methods can be used to check for broken wires?
Rubbing a rag along the cable or bending the cable in a way to expose the wires.
What is the main cause of a stall?
Exceeding the critical angle of attack.
As angle of attack increases the center of pressure will do what?
Move toward the leading edge
What is it called when the aft blade of a helicopter goes over its critical AoA?
Retreating blade stall
What are the two most common loads a bolt will experience in service?
Tension and Shear
What is a method of safetying a turnbuckle and what is the "preferred method"?
Double Wrap Spiral
What are the axis of flight and what is movement of that axis caused by flight surface and control?
Lateral, elevators, push and pull the yoke
Longitudinal, ailerons, rotating the yoke
Vertical, rudders, foot pedals
Washing in the left wing of an aircraft will have the effect of what?
Both drag and lift will increase due to a higher angle of attack.
On a semi rigid rotor craft what does the rotor disk tip about?
The teetering hinge.