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SF340 Air Systems

  1. What systems are operated by pneumatic air? 2-1
    Air Conditioning, Pressurization, and Ice protection
  2. _____ bleed air automatically supplements the _____ flow as necessary during periods of low engine rpm. 2-1
    HP, LP
  3. What compressor stage is the LP (P2.5) bleed air taken from? 2-2
    5th
  4. What compressor stage is the HP (P3) bleed air taken from? 2-2
    6th
  5. How is the HP valve controlled? 2-2
    Electrically
  6. How is the HP valve operated? 2-2
    Pneumatically
  7. If electric power to the HP bleed valve fails what position would the valve be in? 2-2
    Closed
  8. What are the reasons the HP valve would automatically close? 2-2
    • Bleed air line overheats (exceeds 288ºC)
    • Bleed air line has excessive pressure (exceeds 76 psi)
    • Fire handle is pulled
    • Engine is shutdown
    • Main DC bus power is lost
  9. If electric power to the LP bleed valve fails what position would the valve be in? 2-2
    Open
  10. What are the reasons the LP bleed valve close automatically? 2-2
    • Bleed air line overheats (exceeds 288ºC)
    • Bleed air line has excessive pressure (exceeds 43psi) downstream of the valve
    • Fire handle is pulled
    • Air conditioning pack overheats (exceeds 225ºC)
    • Air conditioning duct overheats (exceeds 82ºC)
  11. What does a BLD CLOSED light indicate? 2-2
    The respective BLD valve is closed
  12. What does a BLD FAULT light indicate? 2-2
    • The respective BLD valve received a closed signal but did not close
    • Bleed air line overheats (exceeds 288ºC)
    • Bleed air line has excessive pressure (exceeds 43psi) downstream of the valve
  13. What does a HP HIGH light indicate? 2-2
    The respective HP valve received a closed signal and did not close
  14. How is HP bleed air cooled? 2-3
    Through a ram air heat exchanger (precooler)
  15. A separate flow through the precooler accomplishes _____ cooling for use by the pneumatic deicer system. 2-3
    LP bleed air
  16. How are the pneumatic systems interconnected so that one bleed air source can supply both air conditioning systems? 2-3
    Cross Valve (X VALVE)
  17. When can the cross valve be used? 2-3
    On ground only
  18. What is required for the X Valve to open? 2-3
    One bleed valve must be closed
  19. How is the X Valve operated? 2-3
    Pneumatically
  20. How is the X Valve controlled? 2-3
    Electrically
  21. What does a X VALVE OPEN light indicate? 2-3
    X Valve is open
  22. What does a BLD AIR LEAK light indicate? 2-3
    Excessive temperature in the bleed line (exceeds 205ºC)
  23. Will a BLD LEAK close the LP bleed valve? 2-3
    No
  24. What does a RECIRC light indicate? 2-12
    A failure of the recirc fan (less than 80%)
  25. Will you get a Master Caution light for a Recirc Fan failing? 2-12
    No
  26. What overhead light will not illuminate an AIR COND light on the CWP? 2-12
    L/R RECIRC light
  27. When is the Auto mode of the temp control to be used? 2-15
    Always unless inop
  28. Does the Manual mode of temp control provide temperature limiting protection to the system? 2-15
    No, only Auto mode does
  29. In the Manual mode of temp control, how long does it take to move the control valve from one extreme to the other extreme? 2-16
    6-8 seconds
  30. What does an AVIONICS VENT light on CWP indicate? 2-16
    Failure of the avionics vent fan
  31. While in flight, if the PRESS DUMP switch is activated what happens? 2-20
    The primary outflow valve is immediately fully opened
  32. While on the ground if the PRESS DUMP switch is activated what happens? 2-20
    The primary and secondary valve are both fully opened
  33. In Auto pressurization mode what is the max differential? 2-24
    7.1psid
  34. How long after touchdown is the primary outflow valve fully opened? 2-24
    20 seconds
  35. Where is the primary outflow valve located? 2-25
    False bulkhead in the tail compartment
  36. How are the outflow valves controlled? 2-25
    Electric and Pneumatic
  37. The outflow valves limit positive pressure to? 2-25
    7.6psid
  38. The outflow valves limit negative pressure to? 2-25
    -0.5psid
  39. If vacuum pressure is lost what position do the outflow valves revert to? 2-25
    Closed
  40. In manual pressurization mode what position is the primary outflow valve in? 2-25
    Closed
  41. What does a CABIN PRESS light indicate? 2-26
    Cabin altitude above 10,000’ or cabin press exceeds 7.5psi
  42. Where is the secondary outflow valve located on the Saab 340? 2-26
    Rear pressure bulkhead
  43. The secondary outflow valve is normally only operated in what mode? 2-26
    Manual mode
  44. What rate of cabin VSI does the detent on the auto controller provide? 2-27
    500 fpm up and 300 fpm down
  45. When would the fault light on the pressurization controller illuminate? 2-27
    • With a system failure
    • During a system self-test and extinguishes with no faults detected
Author
flyinggreasemnky
ID
88230
Card Set
SF340 Air Systems
Description
Colgan Air Saab 340 Chapter 2 - Air Systems
Updated

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