AD 2/3

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AD 2/3
2011-02-17 01:06:16
Assignment nine

turboprop engines and propellors
Show Answers:

  1. What are the major assemblies of the turboprop engine?
    reduction gear assembly, torquemeter assembly, and power section assembly
  2. Which of the following is a subassembly of the turboprop engine?
    the turbine
  3. The torquemeter measures the shaft power output of what engine component?
    power unit
  4. The torquemeter operates on the principle of accurate measurement of...
    torsional deflection
  5. What is another name for inch-pounds of torque?
    shaft horsepower
  6. In the special shafting assembly of the torquemeter, where is the reference shaft connected to the torque shaft?
    at the drive input end
  7. What is the purpose of the propellor reduction gearing?
    to reduce the power section rpm
  8. How many stages of reduction are in the reduction gear assembly?
  9. What does the thrust-sensitive signal actuate?
    propellor feather lever
  10. Which of the following operating conditions does NOT reflect normal functioning of the negative torque signal system?
    power loss during takeoff
  11. For what reason is the safety coupling installed in the turboprop power train?
    to disconnect the prop when excessive negative torque is encountered
  12. Transfer of torque between the power section and the reduction gear assembly must be transmitted through what propellor component?
    safety coupling
  13. Whether the torque is positive or negative depends upon the relationship between which of the following components?
    power section and prop
  14. The propellor brake is designed to decrease the time for the propellor to come to a complete stop after engine shutdown and to prevent which of the following actions?
    windmilling when feathered in flight
  15. What are the three positions of the prop brake?
    released, applied, locked
  16. The friction cone-type propeller brake consists of which of the following members?
    a stationary inner member and a rotating outer member
  17. Regardless of the power lever setting during flight, a predetermined schedule automatically governs the...
    propellorr blade angle and fuel flow
  18. The ground handling range is also called the...
    beta range
  19. Which of the following factors controls prop blade angle in the beta range?
    power levers
  20. By what means does the turboprop fuel control differ from the turbojet fuel control?
    the turboprop fuel control operates with a propellor governor
  21. Blade station
    reference line , designated measurement, made from the hub
  22. Blade
    One arm of a prop from the butt to the tip
  23. Blade face
    The surface of the blade seen by standing directly behind the aircraft
  24. Tip
    The part of the blade farthest from the hub
  25. Shank
    The thick part of the blade near the hub of the prop
  26. Blade back
    The surface of the blade seen by standing in front of the aircraft
  27. Leading edge
    The forward or cutting edge of the blade
  28. Blade angle (pitch)
    The angle formed by the chord of a section of the blade and a plane perpendicular to the axis of rotatioin
  29. Propellor retaining nut.
    The nut that locks the hub to the prop shaft
  30. Hub.
    The central part of the prop fitted into the prop shaft
  31. Of the 54H60-77 designation what indicates the number of changes in the prop?
  32. Of the 54H60-77 designation what shows the number of blades?
  33. Of the 54H60-77 designation what describes the blade shank size and makeup?
  34. Which force tries to rotate the blades in the hub to increase the blade angle?
    aerodynamic twisting moment
  35. Which forces tends to pull blades of the spinning prop from its hub?
  36. Which force tends to bend blade tips forward?
    thrust bending
  37. What is the primary function of a prop system?
    to increase or decrease pitch as required by power lever movement
  38. Which of the following components of the barrel assembly is/are kept together throughout the service life of the prop?
    front and rear barrel sections
  39. Which of the following barrel components carry the high centrifugal blade loads?
    barrel shoulders and lips
  40. The barrel assembly contains what total number of cone types?
  41. The 54H560-77 prop blades are forged from what material(s)?
    solid aluminum alloy only
  42. The blade heater assembly is bonded to what part of the blade?
    the leading edge of the blade fairing
  43. What condition requires blade heater assembly replacement?
    when more than four wires of the heater assembly are damaged
  44. What is the blade angle changing mechanism of the prop system?
    dome assembly
  45. The prop stationary and rotating cams are a part of what system?
    dome assembly
  46. The low pitch stop assembly is mounted to what other assembly?
    dome assembly
  47. The ratchet rings in the pitchlock regulator assembly are held apart by..
    hydraulic pressure
  48. When pitchlock occurs, what device prevents a decrease in the blade angle?
    the ratchet rings
  49. During pitchlock the prop is limited to which of the following conditions?
    operates as fixed pitch prop
  50. What are the two major parts of the 54H60-77 model prop control assembly?
    the pump housing assembly and valve housing assembly
  51. The prop system is comprised of several assemblies, one of which is the pump housing. What is the location of the pump housing?
    The lower part of the prop control assembly
  52. What total number of pumps are located in the pump housing assembly?
  53. Which of the following pumps in the pump housing assembly are driven by a common shaft?
    the auxiliary main pump and auxiliary scavenge pump
  54. During static ground operations, what pump is used to feather and unfeather the prop?
    the feather pump
  55. The valve housing assembly controls what two ranges of operation?
    the alpha and beta ranges
  56. What valve in the valve housing assembly directs pitch change hydraulic pressure to the dome assembly?
    the pilot valve
  57. What component in the valve housing assembly opposes the flyweight centrifugal force?
    the pilot valve
  58. The only approved way to remove damage from a blade is to use diemakers' rifflers and which of the following materials?
    Aluminum oxide paper
  59. How many people are usually needed to remove a prop and place it on a dolly?
  60. What is the only position that allows you to remove the afterbody of a prop without damaging it or the prop blade?
    max reverse
  61. In what position should the prop be cycled after the top and botton sections have been removed?
  62. When removing or installing a prop, you should ensure that the No.1 blade is NEVER turned beyond what positive and what negative limits?
    Minus 15 degrees and positive 100 degrees
  63. Which of the cleaning procedures is/are NOT permitted on internal prop parts?

    Vapor blasting?
    using paper or rags?
    using PD-680?
    Both 1 and 2 above