Systems Ch. 14 Power Plant

  1. What engines are on the Saab 340B
    GE CT7-9B
  2. How much power do the CT&-9B engines produce
    1750 SHP at 35C at sea level
  3. What controls the inlet variable guide vanes
    Hydro mechanical unit (HMU)
  4. How many fuel pumps are installed on each engine
    2 (3 if you include the STDBY pump in the hopper tank)
  5. What fuel pumps are installed on each engine
    HMU HP pump and Main fuel pump
  6. How many fuel pumps are there on the Saab 340
    6, 2 standby pumps, 2 main pumps, and 2 HMU HP pumps
  7. What is used to prevent bird ingestion into the engine
    Inlet protection device (inertial separator)
  8. Where are objects directed after being caught in the inlet protection device
    Overboard through a duct on the underside of the nacelle
  9. Where do items such as sand and hail exit after being separated from airflow
    Through the separator duct and out the tailpipe
  10. What prevents power levers from being retarded below flight idle in flight
    Automatic Flight Idle Stop
  11. The Flight Idle Stop automatically opens at touchdown with what inputs
    • Both main gear down lock switches
    • Anti-skid computer (for wheel speed monitoring)
    • Both weight-on-wheel systems 
  12. What is the placarded operating range for the power levers
  13. What position on the power lever is identified by a detent
  14. How is the FI Stop opened with a WOW failure
    By pulling the FI STOP OVRD knob
  15. When is the FI Stop Automatically opened
    • When either main gear is down and locked AND
    • Any wheel speed exceeds 25kts OR
    • Either WOW detects the A/C on the ground 
  16. If the gear is not retracted when does the FI stop automatically close
    • Both WOW systems detect the A/C is airborne
    • All wheel speeds decrease below 9 kts 
  17. What indication is given if while on the groundwith the FI STOP OVRD knob pulled, the left engine is started
    A red CONFIG warning
  18. Can the CONFIG warning be cancelled for a FI STOP OVRD knob pulled while starting the left engine
    No, the condition lever must be returned to FUEL OFF
  19. What is the placarded operating range for condition levers
  20. The engine driven alternator supplies the Engine Electrical System through 3 separate outputs for the operation of what? 
    • Ignition exciter power supply
    • DECU power supply
    • ENG (Ng) indicator signal 
  21. Are there any controls or indications for the Engine Electrical System
  22. What are the three modes of the ignition system
    Start ignition, Auto ignition, Continuous ignition
  23. When is Start Ignition available
    When the switch is in NORM, ignition is activated when the start relay closes and terminates when the start relay opens at the end of a start cycle
  24. Auto Ignition occurs when the DECU detects what
    Engine flameout or Np over speed
  25. How long is Auto ignition activated for
    7 seconds
  26. When is Continuous Ignition active
    When the switch is selected to CONT or when power is lost from the respectivw battery bus
  27. When will the respective IGN light illuminate on the status panel
    • Anytime the switch is selected to CONT or when NORM is selected and any of the following occur:
    • Engine start cycle
    • Auto relight is activated
    • Control power is lost
    • The power turbine over speeds 
  28. What is used to prevent fuel filter icing
    Fuel Heater
  29. What is the heat source for the fuel heater
    Prop gear box oil
  30. Is fuel heating pilot controlled
    No, it is automatically regulated by a thermal sensor
  31. Can the engine operate without a working main pump
    Yes, stanby pressure is sufficient
  32. Can the engine operate without a HP pump from the HMU
  33. What functions does the HMU provide
    • Fuel scheduling though the metering valve for Ng governing
    • Controls actuation of the inlet guide vanes and anti-ice start beed valve
    • Protects the gas generator spool from over speeding
    • Accomplishes engine shutdown by means of the fuel shutoff valve 
  34. How does the HMU protect the gas generator from over speeding
    By automatically shutting fuel off at 110% Ng
  35. The DECU accomplishes what functions
    • Np over speed protection
    • Auto ignition
    • Bottom Governing 
  36. At what speed does the DECU shut off fuel for Np over speeding
    25000 power turbine RPM or 1572 PRPM
  37. When will the fuel shut off valve be reopened due to a prop over speed
    When the power turbine RPM decreases below 25,000 RPM
  38. What prop RPM does bottom governing maintain
    Minimum of 1040 PRPM
  39. During maximum reversing prop RPM increases to what RPM
    1200 PRPM
  40. Where must the condition lever be in order to obtain bottom governing
    MIN-MAX range
  41. What is the function of Bottom Governing
    To maintain a minimum prop RPM during taxi and reverse operations
  42. What controls CTOT and APR operation
    The DECU through the HMU torque motor
  43. If a flameout should occur what % increase does the APR provide
    7% to operating engine
  44. What procedure is done to correct a DECU failure that is causing over-temp, overtorque, or prop over speed 
    Torque motor lockout
  45. While in T/M range where is fuel vented to
    Fuel is vented overboard so it is important not to stay in the T/M range
  46. Does T/M lockout affect propeller governing
  47. What "normal" functions will be lost while operating in T/M lockout
    Bottom governing, CTOT and APR functions
  48. Before selecting the CTOT switch to ON or APR, power should be set to 
    Within 15-20% of target torque, but no lower than 75%
  49. What temperature will the CTOT limit the engine to
  50. Does the CTOT provide torque and temp protection during T/O and GA
    Yes, it will increase to selected torque value or 955C whichever occurs first
  51. Does the Autocoarsen switch have to be on to achieve APR function
  52. What is indicated by an oil pressure gauge reading zero without a CWP light on
    Failure of the oil pressure gauge
  53. With a leak in oil pressure what would typically be noticed
    Pressure dropping to around 20psi and fluctuating, followed by either constant or decreasing oil temp due to air being introduced into that line
  54. How is scavenge oil cooled
    By an oil-to-fuel cooler and then directed to the inlet frame vanes to aid in inlet anti-icing which further cools the oil
  55. Of the 5 quarts in the prop gear box reservoir how much is kept for a reserve for emergency feathering
    1 quart
  56. With the PL above FLT IDLE what psi triggers an OIL PRESS CWP
    Below 25 psi
  57. With the PL below FLT IDLE what psi triggers an OIL PRESS CWP
    Below 7 psi
  58. What is a characteristic of a pressure transducer failure for the oil system
    Indication will rapidly go to zero or to the upper limit of the gauge
  59. What is indicated by an illuminated ENG OIL PRESS light on the CWP
    The associated prop gear box OR engine oil pressure is low
  60. What is the governor speed control range
    1150 to 1396 PRPM
  61. On the Dowty props what is used to drive the engine to the feathered position
    Prop oil pressure
  62. With a loss of prop oil press will the prop feather when CL is in fuel off
  63. How is the Prop feathered after a loss of Prop oil pressure
    Using the MAN FEATHER pump
  64. What are the 2 different modes for the Autocoarsen System
    High or Low power modes
  65. AUTOCOARS LOW light illuminates when which conditions exist
    • One or both PL less than 64 degrees
    • Ng greater than 55% on both engines
    • Starter/ Generator RPM greater than 60% on both engines 
  66. Auto coarsen is activated in low mode when which conditions exist
    • Ng less than 55% on failed engine
    • Starter/ Generator RPM less than 60% on the failed engine 
    • Ng greater than 55% on operating engine 
  67. What would cause the prop to "un-coarsen"
    • P3 increases to greater than 120 psi on the failed engine AND
    • Torque increases above 50% on the failed engine OR
    • The AUTOCOARSEN switch is seleted to OFF 
  68. What conditions must be met for the AUTOCOARS HIGH light to illuminate
    • PL greater than 64 degrees
    • Torque at least 50%
    • P3 less than 120 psi 
  69. Auto coarsen is activated in high mode if what conditions exist
    • PL greater than 64 degrees on both engines
    • Torque greater than 50% on operating engine
    • Torque less than 50% on the failed engine
    • Torque differential greater than 25% between engines
    • P3 less than 120 psi on the failed engine 
  70. What is indicated by an illuminated AUTOCOARS CWP light
    Autocoarsen computer has failed
  71. What is used to keep both props at the same RPM
    A Prop Synchrophaser
  72. Which prop is considered the Master prop in the Synchrophasing system
    The left prop is the master and controls the right prop (slave)
  73. What does the phasing portion of the prop sync do
    Positions the blades so only one blade crosses the wing root at a time between both engines
  74. At what temperature do the ENGINE OV TEMP lights illuminate
    When ITT exceeds 962C
  75. If an engine temperature of 1050C what would be read on the gauge 
  76. Which engine gauge operates in digital and analog
    Engine Temp (ITT)
Card Set
Systems Ch. 14 Power Plant
Power Plant