DHC-6-300 Turbine Engines

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Author:
cade_702
ID:
167234
Filename:
DHC-6-300 Turbine Engines
Updated:
2012-08-24 02:05:07
Tags:
Twotter
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Description:
Turbine Engines
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  1. What kind of engines do we have?
    • PT6A-27  /  PT6A-34
    • Pratt & Whitney
    • Reverse flow, annular combustion, free turbine engines.
  2. How many turbines per engine?
    • 2 turbines in each engine - 
    •   - 1 Compressor turbine (driving the compressor)
    •   - 2 Power turbine (driving the propeller)
  3. What is the flow of air / fuel through a PT6?
    • 1. Intake (reverse flow)
    • 2. Compressor
    •   --3 Axial
    •   --1 Centrifugal
    • 3. Combustion chamber
    •   -- Annular (means circular)
    • 4. Compressor Turbine (drives the compressor section)
    • 5. Power turbine (drives propeller)
    • 6. Exhaust (reverses flow again)
  4. Where is T5 measured?
    Between the compressor turbine and the power turbine.
  5. What does free turbine mean?
    In the PT6, the power section and compressor section are not connected (free)
  6. What PSI is the engine driven fuel pump?
    600 PSI
  7. What PSI do the fuel nozzels spray at?
    600 PSI
  8. How many combustion chambers per engine?
    1 chamber (annular)
  9. Spark igniters
    2 per engine
  10. How many fuel nozzles are on each engine?
    • 14 fuel nozzles per engine - 
    •   - 10 primary
    •   - 4 secondary
  11. Fire detectors
    • 4 fire detectors per engine - 
    •   - 2 front, activate at 450 degrees (power section)
    •   - 2 rear, activate at 300 degrees (compressor section)
  12. When does the oil pressure light turn on?
    40 PSI
  13. If oil cap is loose / comes off
    You have 8 minutes before engine quits
  14. What is a hung start?
    The secondary fuel nozzles did not engage / failed to ignite & / or engine stops accelerating all together for whatever reason
  15. What kind of oil for the PT6?
    Mobile Jet II
  16. PT6 oil quantity
    • Oil tank quantity - 2.3 US gallons
    • Oil useable - 1.5 US gallons
    • Oil normal quntity - 1-2 quarts low
  17. Ng is...
    Gas generator speed
  18. Np is...
    Propellor speed
  19. Stators are...
    stationary compressor blades
  20. T5 probes
    8 per engine - they measure the temperature of the air.
  21. How many engine mounts?
    3 per engine

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