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31 Cards in this Set
- Front
- Back
1. Model number
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PT6A-41
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2. Horsepower
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850 SHP
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3. Number of N1 (compressor) turbines
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One
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4. Number of N2 (power) turbines
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Two stage counter-rotating
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5. How many axial stages in the compressor
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Three
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6. How many centrifugal stages in the compressor
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One
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7. Coldest operating temperature
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-65 F (-35 C)
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8. Max time for light off
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10 seconds
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9. Compressor speed at 100% N1
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37,500 RPM
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10. Compressor speed at 102.6% N1
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38,500 RPM
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11. Compressor speed at 101.5% N1
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a. 38,100 RPM
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12. Power turbine speed at 2000 RPM N2
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a. 30,000 RPM
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13. Compression ratio
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a. 9 to 1
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14. Gear reduction ratio (power turbine to propeller gear)
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a. 15 to 1
b. 30,000 RPM reduced at 15 to 1 = 2000 RPM |
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15. Engine fire extinguisher pressure at 70 F
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a. 450 psi
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16. Amount of halon agent in the handheld fire extinguishers
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a. 3/4 pounds
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17. Fire detectors
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a. 3 per engine
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18. Starter limits
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a. 40,60,40,60,40,30 minutes
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19. High pressure bleed air valves
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a. 88 to 92 N1
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20. What side of the engine
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a. right
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21. Low pressure bleed air valves
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a. 66 to 71 N1
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22. What side of the engine
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a. Left
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23. Percentage of air used for burning
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a. 25% of intake air is primary air
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24. When will you expect to be torque limited, as opposed to ITT limited
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a. When it is cold outside
b. When at lower altitudes |
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25. What do the PCLs connect to
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a. The cambox
b. The fuel control unit |
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26. Where do the prop levers connect to
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a. Primary governor
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27. Where do the condition levers go to
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a. The fuel control unit
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28. Can we relight an engine after using the fire extinguisher on it
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a. If it is absolutely necessary
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29. Why do we not start the second engine with the generator engaged during the entire starting process
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a. Initially the starter requires 700 Amps. If we used the generator, this would blow the 325 AMP slow blow fuse
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30. What does the test position do for autofeather
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a. Bypasses the 90% N1 stipulation
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31. Which engine is the critical engine
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a. Left engine
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