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2a353 Volume 2 CH 2
Air Force Aircraft Maintenance CDC Questions 2016
| Question | Answer |
|---|---|
| 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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