2A651 Edition2 Volume 4

79 Questions

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2A651 Edition2 Volume 4

Questions and Answers
  • 1. 
    (601) Which 54H60–117 propeller subassembly transmits engine torque to the propeller blades?
    • A. 

      Barrel.

    • B. 

      Control.

    • C. 

      Low pitch stop.

    • D. 

      Pitchlock regulator.

  • 2. 
    (601) Which 54H60–117 propeller subassembly carries high centrifugal loads created by the propeller blades?
    • A. 

      Dome.

    • B. 

      Barrel.

    • C. 

      Control.

    • D. 

      Front spinner.

  • 3. 
    (601) On the 54H60–117 propeller, which component delivers the actual propeller blade angle from the blade to the control assembly?
    • A. 

      Microadjusting ring.

    • B. 

      Beta feedback shaft

    • C. 

      Blade segment gear

    • D. 

      Blade bushing.

  • 4. 
    (601) On the 54H60–117 propeller, which pitchlock component mechanically holds the stationary and rotating pitchlock ratchets apart during reversing and unfeathering operations?
    • A. 

      Pitchlock control cam.

    • B. 

      Pitchlock ratchet piston

    • C. 

      Externally threaded ring.

    • D. 

      Externally splined spacer ring.

  • 5. 
    (601) On the 54H60–117 propeller, what component is installed on the blade before the blade butt is formed during manufacture?
    • A. 

      Slip rings.

    • B. 

      Microadjusting ring.

    • C. 

      Roller thrust bearing.

    • D. 

      Beveled thrust washer.

  • 6. 
    (601) On the 54H60–117 propeller, which dome assembly part allows the rotating cam to turn while the stationary cam remains in a fixed position?
    • A. 

      Roller shaft.

    • B. 

      Track slopes.

    • C. 

      Ball bearings.

    • D. 

      Roller bearings.

  • 7. 
    (601) On the 54H60–117 propeller, which dome assembly component limits cam travel and prevents the propeller from exceeding feather and reverse blade angles?
    • A. 

      Rotating pitchlock ratchet.

    • B. 

      Low pitch stop.

    • C. 

      Stationary cam.

    • D. 

      Stop ring.

  • 8. 
    (601) On the 54H60–117 propeller, what function is a task of the low pitch stop assembly?
    • A. 

      Prevents the propeller from going into the beta range when the throttle is positioned in the alpha range.

    • B. 

      Limits cam travel and prevents the propeller from exceeding feather and reverse blade angles.

    • C. 

      Prevents the blades from decreasing pitch if an overspeed condition occurs

    • D. 

      Transmits engine torque to the blades.

  • 9. 
    (601) On the 54H60–117 propeller, which component’s purpose is to provide electrical circuits between the brush block assembly and the deicing elements of the blade assemblies?
    • A. 

      Control assembly.

    • B. 

      Front spinner section.

    • C. 

      Hub mounting bulkhead.

    • D. 

      Deicer contact ring holder

  • 10. 
    (602) On the 54H60–117 propeller, during normal propeller operation, the output of which pumps is used?
    • A. 

      Main pressure and main scavenge

    • B. 

      Standby pressure and main scavenge.

    • C. 

      Auxiliary pressure and main pressure.

    • D. 

      Auxiliary pressure and auxiliary scavenge.

  • 11. 
    (602) On the 54H60–117 propeller, which pump(s) is/are used during propeller static operation?
    • A. 

      Main pressure.

    • B. 

      Main scavenge.

    • C. 

      Standby pressure and main scavenge.

    • D. 

      Auxiliary pressure and auxiliary scavenge.

  • 12. 
    (602) On the 54H60–117 propeller, which cam disarms the NTS system linkage when the throttle is positioned in the beta range?
    • A. 

      Manual feather

    • B. 

      Beta follow-up.

    • C. 

      Speed set.

    • D. 

      Beta set.

  • 13. 
    (602) On the 54H60–117 propeller, which cam schedules a desired blade angle in the beta range?
    • A. 

      Beta set.

    • B. 

      Beta follow-up.

    • C. 

      Beta shaft rigging.

    • D. 

      Alpha shaft rigging.

  • 14. 
    (602) On the 54H60–117 propeller, which valve connects the main, standby, and auxiliary pressure pumps’ output to the increase pitch lines during negative torque conditions?
    • A. 

      High pressure relief.

    • B. 

      Feather actuating.

    • C. 

      Feather.

    • D. 

      Pilot.

  • 15. 
    (602) On the 54H60–117 propeller, which valve assists the feather solenoid valve with hydraulic positioning of the feather and pilot valves?
    • A. 

      High pressure relief.

    • B. 

      Feather actuating.

    • C. 

      Standby.

    • D. 

      Backup.

  • 16. 
    (602) On the 54H60–117 propeller, what switch, located in the valve housing, is opened by a cam from 81 to 85 propeller blade angle?
    • A. 

      Beta indicator.

    • B. 

      Pressure cutout.

    • C. 

      NTS.

    • D. 

      PCBS.

  • 17. 
    (602) The 54H60–117 propeller governor speeder spring tension positions the pilot valve to maintain what percent rpm in the beta range?
    • A. 

      104 to 108%.

    • B. 

      114 to 118%.

    • C. 

      99 to 103%.

    • D. 

      109 to 113%.

  • 18. 
    (603) On the 54H60–117 propeller, if the main filter becomes clogged, which valve opens to assure continued flow?
    • A. 

      Check

    • B. 

      Bypass.

    • C. 

      Low pressure relief.

    • D. 

      High pressure relief.

  • 19. 
    (603) On the 54H60–117 propeller, when the backup valve is opened, the hydraulic pressure routed to the governor pilot valve is used for which operation?
    • A. 

      Pitchlock.

    • B. 

      Standby.

    • C. 

      Reverse.

    • D. 

      Airstart.

  • 20. 
    (603) On the 54H60–117 propeller, which pressure pump is used to feather or unfeather the propeller during static propeller operation?
    • A. 

      Main.

    • B. 

      Backup.

    • C. 

      Standby.

    • D. 

      Auxiliary.

  • 21. 
    (603) On the 54H60–117 propeller, which type of valve opens to allow the output of the standby pump to combine with the output of the main pump?
    • A. 

      Check.

    • B. 

      Bypass.

    • C. 

      Low pressure relief.

    • D. 

      High pressure relief.

  • 22. 
    (603) On the 54H60–117 propeller, when standby pump output is not required, where is it routed?
    • A. 

      Atmospheric sump.

    • B. 

      Pressurized sump.

    • C. 

      Dome assembly.

    • D. 

      Pilot valve.

  • 23. 
    (604) What type of force used during pitchlock of the 54H60–117 propeller prevents the blades from decreasing pitch?
    • A. 

      Spiral bending.

    • B. 

      Thrust bending.

    • C. 

      Centrifugal twisting moment.

    • D. 

      Aerodynamic twisting moment.

  • 24. 
    (604) The purpose of the 54H60–117 propeller pitchlock assembly is to prevent
    • A. 

      Loss of oil pressure.

    • B. 

      Flow of hydraulic fluid to the pilot valve.

    • C. 

      An engine overspeed due to a loss of power.

    • D. 

      Engine overspeed due to a loss of hydraulic pressure.

  • 25. 
    (604) What prevents engagement of the stationary and rotating ratchets on the 54H60–117 propeller when blade angles are below 25° and above 55°?
    • A. 

      Loss of hydraulic pressure.

    • B. 

      The pitchlock control cam.

    • C. 

      An overspeed in excess of 103.5%.

    • D. 

      Increase- or decrease pitch pressure

  • 26. 
    (604) What will keep the rotating and stationary ratchets disengaged on the 54H60–117 propeller when the blade angles are between 25° and 55°?
    • A. 

      Loss of hydraulic pressure

    • B. 

      The pitchlock control cam.

    • C. 

      An overspeed in excess of 103.5%.

    • D. 

      Increase- or decrease pitch pressure

  • 27. 
    (604) On the 54H60–117 propeller, what forces the stop levers on the low pitch stop to move outward?
    • A. 

      Hydraulic pressure.

    • B. 

      Movable wedge.

    • C. 

      Dome piston.

    • D. 

      Servo valve.

  • 28. 
    (604) When pressure builds to between 240 and 280 psi on the 54H60–117 propeller, which valve is unseated and allows the stop levers to retract?
    • A. 

      Servo.

    • B. 

      Backup.

    • C. 

      Governor pilot.

    • D. 

      Low pressure relief.

  • 29. 
    (605) What is coordinated by the throttle in the controllable pitch range?
    • A. 

      Propeller blade pitch and engine fuel flow.

    • B. 

      Propeller blade pitch and temperature limiting.

    • C. 

      Engine fuel flow and constant speed governing.

    • D. 

      Temperature limiting and constant speed governing.

  • 30. 
    (605) Constant speed can only occur when the throttle is positioned from
    • A. 

      RVS to FLT IDLE

    • B. 

      RVS to GND IDLE.

    • C. 

      GND IDLE to FLT IDLE.

    • D. 

      FLT IDLE to TAKE OFF.

  • 31. 
    (606) On the 54H60–117 propeller, what is the beta range indication display on the coordinator?
    • A. 

      34 to 90.

    • B. 

      18 to 90.

    • C. 

      0 to 34.

    • D. 

      0 to 18.

  • 32. 
    (606) On the 54H60–117 propeller, during beta range operation, what moves the pilot valve?
    • A. 

      Cams and mechanical linkage.

    • B. 

      Flyweights and speeder spring.

    • C. 

      Hydraulic pressure.

    • D. 

      Throttle.

  • 33. 
    (606) In the beta range of the 54H60–117 propeller, which cam increases the speeder spring tension?
    • A. 

      Beta set.

    • B. 

      Speed set.

    • C. 

      Backup valve.

    • D. 

      Beta follow-up.

  • 34. 
    (606) During beta range operation on the 54H60–117 propeller, which cam’s rotation moves the mechanical linkage to center the governor pilot valve?
    • A. 

      Beta set.

    • B. 

      Speed set.

    • C. 

      Backup valve.

    • D. 

      Beta follow-up.

  • 35. 
    (606) During alpha range operation on the 54H60–117 propeller, which cam changes speeder spring tension so the governor pilot valve can maintain 100 percent engine speed?
    • A. 

      Beta set.

    • B. 

      Speed set.

    • C. 

      Backup valve.

    • D. 

      Beta follow-up.

  • 36. 
    (606) During an overspeed condition in the alpha range on the 54H60–117 propeller, the flyweights move the governor pilot valve to meter hydraulic fluid, which will
    • A. 

      Increase blade angle.

    • B. 

      Decrease blade angle.

    • C. 

      Engage the low pitch stop.

    • D. 

      Engage the pitchlock ratchets.

  • 37. 
    (606) Once an overspeed 54H60–117 propeller condition is corrected and the pilot valve is returned to the center position, what is the result?
    • A. 

      Hydraulic fluid flow to the dome assembly is increased.

    • B. 

      Blades are moved to the feather position.

    • C. 

      Propeller starts to underspeed.

    • D. 

      System is back on-speed.

  • 38. 
    (606) During an underspeed condition on the 54H60–117 propeller, what moves the pilot valve?
    • A. 

      Decreased hydraulic pressure.

    • B. 

      Increased hydraulic pressure.

    • C. 

      Speeder spring.

    • D. 

      Flyweights.

  • 39. 
    (607) When feathering the 54H60–117 propeller, what acts on the mechanical linkage to open the feather actuating valve?
    • A. 

      Throttle.

    • B. 

      Beta shaft.

    • C. 

      Pilot valve.

    • D. 

      Manual feather cam.

  • 40. 
    (607) During 54H60–117 propeller feathering operation, the feather valve is positioned to meter hydraulic fluid to the
    • A. 

      Aft end of the dome piston.

    • B. 

      Forward end of the dome piston.

    • C. 

      Decrease-pitch side of the pilot valve.

    • D. 

      Increase-pitch side of the pilot valve.

  • 41. 
    (607) Which valve is a backup in case the feather valve fails during feathering operation on the 54H60–117 propeller?
    • A. 

      Pilot.

    • B. 

      Feather solenoid.

    • C. 

      Feather actuating.

    • D. 

      Standby pump check.

  • 42. 
    (607) During the 54H60–117 propeller feathering operation, which valve acts as a backup for the feather actuating valve?
    • A. 

      Pilot.

    • B. 

      Feather.

    • C. 

      Feather solenoid.

    • D. 

      Standby pump check.

  • 43. 
    (607) During the 54H60–117 propeller feathering operation, which valve blocks off the standby pump output and causes hydraulic pressure to increase?
    • A. 

      Feather.

    • B. 

      Standby check.

    • C. 

      Feather solenoid.

    • D. 

      Feather actuating.

  • 44. 
    (607) During feather operation on the 54H60–117 propeller, what range in pounds per square inch (psi) of fluid pressure opens the pressure cutout switch contacts?
    • A. 

      0 to 200.

    • B. 

      300 to 500.

    • C. 

      600 to 800.

    • D. 

      900 to 1,100.

  • 45. 
    (607) Which component on the 54H60–117 propeller is the primary electrical ground for energizing the feather override holding coil?
    • A. 

      Feather relay.

    • B. 

      Feather solenoid.

    • C. 

      Pressure cutout switch.

    • D. 

      Pressure cutout backup switch (PCBS).

  • 46. 
    (607) When attempting to unfeather the 54H60–117 propeller in flight, where must the throttle be positioned?
    • A. 

      Any throttle position.

    • B. 

      Above FLT IDLE.

    • C. 

      At TAKE OFF.

    • D. 

      At GND IDLE.

  • 47. 
    (607) Which two cams on the alpha shaft control the 54H60–117 propeller unfeathering operation?
    • A. 

      Speed set and beta follow-up.

    • B. 

      Manual feather and beta set.

    • C. 

      Speed set and pressure cutout backup switch.

    • D. 

      Manual feather and pressure cutout backup switch

  • 48. 
    (607) On the 54H60–117 propeller, what is the minimum psi required to release the feather latches and allow the piston to move forward?
    • A. 

      200

    • B. 

      400

    • C. 

      600

    • D. 

      800

  • 49. 
    (607) On the 54H60–117 propeller, after the NTS system actuator rod positions the mechanical linkage in the valve housing when a negative torque condition occurs, what component is shifted?
    • A. 

      Pilot valve.

    • B. 

      Beta set cam.

    • C. 

      Speed set cam.

    • D. 

      Feather actuating valve.

  • 50. 
    (608) Besides maintaining the optimum blade phase angle relationship between all propellers, synchrophasing also
    • A. 

      Keeps the propellers rotating at the same speed.

    • B. 

      Keeps the propellers rotating at different speeds.

    • C. 

      Prevents the pilot valve from shifting to increase blade angle.

    • D. 

      Prevents the pilot valve from shifting to decrease blade angle.

  • 51. 
    (608) Which switch has a spring-loaded guard to hold it in the NORMAL position?
    • A. 

      Propeller governor control.

    • B. 

      Synchrophaser disarming.

    • C. 

      Prop resynchrophase.

    • D. 

      Synchrophase master.

  • 52. 
    (608) What rpm in the alpha range are the fuel governing check switches used to reset the propeller governor?
    • A. 

      100%.

    • B. 

      102%.

    • C. 

      104%.

    • D. 

      106%.

  • 53. 
    (608) On the 54H60–91 propeller speed bias motor, what results when the control winding voltage is different from the reference-winding voltage?
    • A. 

      Throttle anticipation potentiometer speeds up or slows down the engine.

    • B. 

      Speed bias motor rotates, and increases or decreases blade angle.

    • C. 

      Feedback potentiometer recenters the speed bias motor.

    • D. 

      Speed bias servo control locks the clutch and brake unit.

  • 54. 
    (608) The master synchrophaser board located in the synchrophaser unit contains a master channel and a slave channel used by propellers
    • A. 

      No. 1 and No. 2.

    • B. 

      No. 2 and No. 3.

    • C. 

      No. 3 and No. 4.

    • D. 

      No. 1 through 4.

  • 55. 
    (608) How much change in rpm does the compensating network in the synchrophaser unit allow the speed bias motor to correct?
    • A. 

      2%

    • B. 

      4%

    • C. 

      6%

    • D. 

      8%

  • 56. 
    (609) In the mechanical governing mode, what causes the pilot valve to move and set the 54H60– 117 propeller speed?
    • A. 

      Throttle movement.

    • B. 

      Speeder spring or flyweights.

    • C. 

      Beta set cam and beta follow-up cam.

    • D. 

      Speed set cam and manual feather cam.

  • 57. 
    (609) Which propeller governing modes add more functionality to basic mechanical governing mode?
    • A. 

      Synchrophasing and beta range.

    • B. 

      Normal and synchrophasing.

    • C. 

      Beta and normal range.

    • D. 

      Alpha and beta range.

  • 58. 
    (609) For the 54H60–117 propeller to operate in the normal governing mode, the propeller governor control switch must be placed in the NORMAL position and the throttle must be
    • A. 

      At or above FLT IDLE and the synchrophase master switch in the ENG 2 or ENG 3 position.

    • B. 

      At or above FLT IDLE and the synchrophase master switch in the OFF position.

    • C. 

      Below FLT IDLE and the prop resynchrophase switch in RESYNC/INDEX.

    • D. 

      Below FLT IDLE and the fuel governing switch in CHECK.

  • 59. 
    (609) When an increase in rpm occurs during engine speed stabilization, how is an overspeed condition prevented?
    • A. 

      Decrease speeder spring tension and position the pilot valve to increase blade angle.

    • B. 

      Increase speeder spring tension and position the pilot valve to decrease blade angle.

    • C. 

      Decrease flyweight rotation and position the pilot valve to increase blade angle.

    • D. 

      Increase flyweight rotation and position the pilot valve to decrease blade angle.

  • 60. 
    (609) How many slave channels are contained on the master synchrophaser board in the synchrophaser unit?
    • A. 

      One

    • B. 

      Two

    • C. 

      Three

    • D. 

      Four

  • 61. 
    (609) If the slave propeller blades are in the correct phase angle position during the synchrophasing governing mode, the resultant phase error voltage is
    • A. 

      +1.5.

    • B. 

      +1.

    • C. 

      0.

    • D. 

      –1.

  • 62. 
    (610) In the event the R391 Dowty propeller lost hydraulic pressure, the counterweights installed at the root of each propeller blade would drive the propeller blades toward what position?
    • A. 

      Max Reverse.

    • B. 

      Ground Idle.

    • C. 

      Take Off.

    • D. 

      Feather.

  • 63. 
    (610) Which R391 Dowty propeller component routes engine oil to and from the cylinder and piston?
    • A. 

      Beta tube.

    • B. 

      GBE valve.

    • C. 

      PUAD.

    • D. 

      GMAD.

  • 64. 
    (610) What R391 Dowty propeller assembly part provides an aerodynamic faring over the aft section of the hub?
    • A. 

      Backplate.

    • B. 

      Rear spinner.

    • C. 

      Front spinner.

    • D. 

      Afterbody assemblies.

  • 65. 
    (611) The pneumatic air bled from the small gas turbine engine cannot be used to
    • A. 

      Inflate aircraft tires.

    • B. 

      Remove snow and ice from aircraft surfaces.

    • C. 

      Supply pneumatic power to aircraft pneumatic starters.

    • D. 

      Provide pneumatic power for air-conditioning systems.

  • 66. 
    (611) When used for ground operation, the SGT engine can be installed on
    • A. 

      Pods.

    • B. 

      An H-frame.

    • C. 

      A two-wheel trailer.

    • D. 

      A four-wheel trailer.

  • 67. 
    (611) The “C” in the engine number GTCP 165 indicates that the engine
    • A. 

      Provides electrical power.

    • B. 

      Provides compressed air.

    • C. 

      Is gas powered.

    • D. 

      Is a turbine.

  • 68. 
    (612) The impeller wheel and two turbine wheels in the turbine section of the GTCP 165 engine are connected by
    • A. 

      Couplings on a common shaft.

    • B. 

      A gear reduction gearbox.

    • C. 

      Helical splines.

    • D. 

      Tie bolts.

  • 69. 
    (613) On a GTCP 165 engine, the accessory drive section aft housing contains the
    • A. 

      Fuel control unit.

    • B. 

      Oil pump assembly.

    • C. 

      Vane-axial fan assembly.

    • D. 

      Compressor front shaft bearing.

  • 70. 
    (614) On a GTCP 165 engine, which signals are used by the fuel control unit to control engine operation?
    • A. 

      Engine speed and pneumatic thermostat (load control) air pressure.

    • B. 

      Ambient inlet pressure and turbine exhaust pressure.

    • C. 

      Engine speed and turbine inlet temperature.

    • D. 

      Pt0 and Pt7.

  • 71. 
    (614) On GTCP 165 engine shutdown, what valve closes to ensure fuel-flow is terminated?
    • A. 

      Poppet.

    • B. 

      Scheduling.

    • C. 

      Fuel flow divider.

    • D. 

      Fuel shutoff solenoid.

  • 72. 
    (615) What type of sump design is the oil system on a GTCP 165 engine?
    • A. 

      Wet

    • B. 

      Dry

    • C. 

      Hot

    • D. 

      Cold

  • 73. 
    On a GTCP 165 engine, which component shuts the engine down if the oil pressure drops below the safe minimum operating limit?
    • A. 

      Oil/air cooler.

    • B. 

      Oil filter assembly.

    • C. 

      Oil pressure switch.

    • D. 

      Oil pressure regulator valve.

  • 74. 
    (615) On a GTCP 165 engine oil system, air that leaks past various oil seals exits through the
    • A. 

      Vent system.

    • B. 

      Pressure system.

    • C. 

      Scavenge system.

    • D. 

      Auxiliary system.

  • 75. 
    (616) During a normal start on a GTCP 165 engine, the igniter plug continues firing until engine rotation in rpm reaches
    • A. 

      75 percent

    • B. 

      80 percent.

    • C. 

      95 percent.

    • D. 

      100 percent.

  • 76. 
    (616) During normal GTCP 165 engine shutdown, what circuit trips to stop the engine?
    • A. 

      100-percent circuit.

    • B. 

      110-percent circuit.

    • C. 

      Load-control circuit.

    • D. 

      Speed-switch control circuit.

  • 77. 
    (617) The modulating and shutoff valve on a GTCP 165 engine will be fully open at what percent rpm?
    • A. 

      60

    • B. 

      70

    • C. 

      80

    • D. 

      90

  • 78. 
    (617) On a GTCP 165 engine, air for the load control system is extracted from the
    • A. 

      Torus.

    • B. 

      Combustor.

    • C. 

      Turbine plenum.

    • D. 

      Compressor deswirl vanes.

  • 79. 
    (617) During load control system operation on a GTCP 165 engine, the pneumatic thermostat is used to
    • A. 

      Allow for stall-free engine acceleration.

    • B. 

      Prevent engine exhaust over-temperature.

    • C. 

      Measure the compressor exit air temperature.

    • D. 

      Measure the compressor inlet (ambient) air temperature.