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2a353 Volume 2 CH 2

Air Force Aircraft Maintenance CDC Questions 2016

Which fuselage design does not use formers, frame assemblies, or bulkheads to give shape to the fuselage? Monocoque Design
What internal wing components serve as an attachment point for the skin? Ribs and Stringers
What type of material is usually used for construction of flight control surfaces? Aluminum Alloy
What is used to round out the angle formed between the fixed tail surface and the fuselage? Fairing
What structure unit provides a smooth airflow around and into the engine unit? Engine Nacelle's
What component controls airflow around the weapons to reduce turbulence in the bay on some bomber aircraft? Bay Spoilers or Air Spoilers
How do doors differ from panels? Doors are hinged
Most transparent structures on an aircraft, such as the canopy, are made of what two materials? Transparent Plastics and Safety Glass
How do paint removers and stripping compounds affect the plastic facings of a radome? It may adversely affect its electrical properties or strength
How are fuselage station numbers measured? In inches from the reference datum or zero point on or near the aircraft nose
What instrument measures the weight of air? Mercurial Barometer
What is the standard atmospheric pressure at sea level measured in inches of Mercury? In PSI? 29.92 inches Mercury 14.7 PSI
What are the 2 temperature scales most commonly used? Fahrenheit and Celsius
If two aircraft are flying with the same horsepower but at different altitudes, why does the aircraft flying at higher altitude fly faster? Higher altitude has less dense air therefore causing less drag
What is the term for the curve of the surface of an airfoil from the leading edge to the trailing edge? Camber
What aerodynamic forces affect aircraft in flight? Lift, Weight, Thrust, Drag
How does drag act in relation to relative wind? Parallel
Define AOA Angle between the mean chord line of an airfoil and the aircraft flight path
How are airframe components joined? Rivets, Bolts, Screws, Welds, Adhesives
What are the 5 stresses to which airframes are subjected? Tension, Compression, Torsion, Shear, Bending
What are the 3 axes that an aircraft operates around? Lateral, Longitudinal, Vertical
What are the lateral control surfaces of the aircraft? Ailerons, Spoilers/Speed Brakes, Wing Flaps
What controls ALL directional movements of aircraft? Primary Flight Controls
What primary flight controls guides the aircraft above the vertical axis? Rudder
What type of Stabilator has BOTH sides connected together so that when one side moves the other side must move in the same direction and amount? Solid Type
What is an elevon? An Aileron and an Elevator
What are the 5 types of wing flaps? Plain, Split, Fowler, Slotted, Leading Edge Slats or Flaps
What is the difference between leading edge flaps and wing slats? Leading edge in conjunction with trailing edge= Leading Edge Flaps Independent=Slats
What is the purpose of speed brakes? Increases drag to slow the aircraft and/or reduce landing distance
List the 3 types of trim systems Roll, Pitch, Yaw
Which type of flight control system reduces the need for long cables, turnbuckles, quick disconnects, push-pull rods, and the associated flight control hardware? Fly-By-Wire
What are the 2 major parts of the AFCS? Stab Aug System, A/P system
What system is used to make bomber aircraft stable for launching weapons? Stab Aug
What auto pilot system mode automatically maintains aircraft speed? Mach Hold
Define Electricity A class of physical phenomena arising from the existence and interactions of electrical charges
Of what particles are atoms composed? Protons, Neutrons, and Electrons
List four examples of insulators Wood, Rubber, Plastic, Glass
List 4 types of conductors Platinum, Gold, Silver, Copper
Where do you normally use semi-conductors In solid state devices
What is EMF? Electromotive Force=the electrical pressure that causes electrons to flow through the conductor
Define electrical current The movement of electrons affect the amount of resistance in a conductor
What factors affect the amount of resistance in a conductor? The type of material used, temperature, and size
What unit of measurement is used to express electrical power? Watts
What is a simple definition of magnetism? The ability of a substance to attract
How are artificial magnets classified? Permanent or Temporary
What is permeability? The ease of ability to conduct magnetic lines of force
What is residual magnetism? The amount of magnetism that remains in a temporary magnet
How is magnetism induced in magnetic material? Place in a magnetic field or bring it into contact with another magnet
Can magnetic lines of force be insulated? NO
What are the 3 most commonly used shapes of magnets? Bar, Ring, Horseshoe
How can a magnet be weakened? Heating or excessive jarring
Define Flux A term for magnetic lines of force
How is electromagnetism developed? By current of electricity
When current flows through a conductor, does a magnetic field exist? Yes
Why is AC used as the primary electrical power source in aircraft? Less power is lost during transmission and the elimination of insulation and brushes
What is the unit or measurement for frequency? Hertz
Define phase relationship A condition in which 2 or more moving objects are changing in, or out, of step
What are the 2 classifications of AC generation systems? Variable Frequency and Constant Frequency
What frequency is used for AC power generation on aircraft? 400 Hertz
How is voltage induced in a brush-type generator? DC from an integral excitor generator is passed through windings on the rotor
What are the 3 generators that make up a brushless AC generator? A PMG, an AC ecitor generator, and the main AC generator
What weak point was eliminated by the design of a brushless-type generator? Arcing
What are the 2 main components of an AC generator? Rotor Assembly and Stator
What 3 components make up the stator? PMG Armature, Excitor Field, Main Armature Windings
What are the 2 funstoins of the CSD governor system? To control the drive output speed and equalize the load between generators operating in parallel
If CSD output rotation drives the generator below 365 Hz, what component removes the generator from the bus? Underspeed Switch
If the CSD temperature rises to an overheat condition, what should be done to prevent further damage? Disconnect the CSD
What is installed on most IDG's to provide for easier installation and removal? A quick attach-detach clamp
What are the typical functions of a GCU? Voltage regulation, Frequency and Load Control, Real and Reactive Load Division, Over/Under excitation protection, Over/ Under Frequency protection, open phase protection, reverse power protection, differential current protection, engine underspeed protec
How is voltage regulation and current limiting accomplished in the GCU? By varying the generator excitation field
How does the frequency and load controller for each generator system regulate the frequency of the generator CSD? By controlling the magnetic trim head governor on the CSD
What are the internal components of a battery? Plates, Separators, and Electrolytes
What are the primary causes of premature failure of a lead-acid battery? Abuse, Overcharge, low solution, undercharge and mountings
Created by: wcarrel11
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